Year
| Case Name | Opening Date | Last Update | Status | Description |
|---|---|---|---|---|
| PM_MYD_23027 | 2023-01-27 | 2023-01-27 | Note | Decommissioning of the MODIS C6 Forward Processing C6 Forward processing of Terra and Aqua MODIS Land data products will be discontinued, on February 15, 2023 (02/15/2023). The C6 land data products have always suffered from known calibration issues that were discovered by the instrument Cal/Val team after the completion of the C6 reprocessing. The main issue among these being the increased impact of optical crosstalk in the Terra PV LWIR bands 27-30, that had made retrieval of most atmospheric parameters infeasible, indirectly impacting some of the land products that were dependent on these atmospheric retrievals. The Collection 6.1 (C61) corrects for this and some other critical calibration issues and also has a number of product specific improvements and enhancements that are listed in the C61 change document<A href="https://landweb.modaps.eosdis.nasa.gov/data/userguide/MODIS_Land_C61_Changes.pdf"> here.</A><br><br>Given the improved performance and calibration of C61, users are requested to switch to C61 for all of their MODIS land data needs. DAACs, will retain the C6 historical land data products for a further period of 6 months, following this decommissioning of the C6 forward processing, and will decommission all C6 land data products after the expiry of this 6-month retention period.<br><br> |
| PM_MYD_22221 | 2022-08-11 | 2022-08-11 | Pending | Data loss 2022.221 On August 9th, 2022 (2022.221) a data loss occurred in Aqua MODIS, the cause is currently unknown. The event resulted in a data loss from 2022.221/16:27:18 - 2022.221/16:43:27. This directly impacted granules 16:20 through 16:45, which have not been produced in both the operational C6 or C61 processing streams. The impacts to NRT can be found <A href="https://landweb.modaps.eosdis.nasa.gov/displayissue?id=267"> here.</A> The data gap occurred during a daytime orbit over South America and the image below shows this gap highlighted in red. This note will be updated as more information on recovery attempts and reprocessing become available. |
| AS_MYD_22045 | 2022-02-14 | 2022-03-01 | Closed | MODIS Aqua Level 0 Data Gap On February 09th, 2022 (2022.040), a data gap occurred on Aqua MODIS. This resulted in a data loss in which granules 2022-02-09 16:05z through 2022-02-09 16:50z as well as granule 2022-02-09 20:00z were not produced. Issues are also seen with granules 2022-02-09 15:55z through 2022-02-09 16:00z. The gap occurred during daytime and nighttime orbit over large swaths of the Americas and Oceania. The image below shows this data gap for both the daytime and nighttime orbit. It is currently unknown whether this data will be available in the future or is permanently lost, but this note will be updated when the missing data is recovered or if recovery proves futile.<br><br><br><br><b><center>******************** <p style="color:red">Aqua Level 0 Data Gap: UPDATE 02.22.22</p> ********************</b></center><br><br>Data has been recovered for periods 16:00 - 16:19 and 16:32 - 16:43. The rest of the data has been lost. A rivised L0 of the Aqua-specific products (MYD*) will be re-processed to include these granules.<br><br><br><br><b><center>******************** <p style="color:red">Aqua Level 0 Data Gap: UPDATE 03.01.22</p> ********************</b></center><br><br>The Aqua L0 was revised and all dailies and Aqua-specific n-days for this day were re-processed to include the recovered granules.<br><br> |
| AS_MYD_22031 | 2022-01-31 | 2022-02-01 | Closed | MODIS Aqua Level 0 Data Gap On January 27th, 2022 (2022.027), a data gap occurred on Aqua MODIS. This resulted in a data loss in which granules 2022-01-27 12:00 through 2022-01-27 14:00 as well as granules 2022-01-27 12:50 through 13:35 were not produced. The gap occurred during daytime and nighttime orbit over large swaths of Europe and Africa. The image below shows this data gap for both the daytime and nighttime orbit. This note will be updated when the missing data is recovered or when recovery proves futile.<br><br><br><br><b><center>******************** <p style="color:red">Aqua Level 0 Data Gap: UPDATE 02.01.22</p> ********************</b></center><br><br>The data has been recovered.<br><br> |
| AS_MYD_21363 | 2021-12-29 | 2022-01-04 | Closed | MODIS Aqua PM1ATTNR GBAD Data Gap On December 26th, 2021 (2021.360) a data gap occurred on Aqua MODIS due to partial and missing input GBAD data caused by a winter storm, which led to issues with PM1ATTNR data. This resulted in a data loss in which granules 2021-12-26 18:00 and 20:00, 22:00 and 23:59 were only partially produced while granules between 2021-12-26 20:00 and 22:00 were not produced. The gap occurred during daytime orbits over large swaths of the Americas and the Pacific Ocean and during nighttime orbits over portions of Europe, Africa, South Asia, and the Indian Ocean. The images below show this data gap for both day and night orbits. This note will be updated when the missing data is recovered or when recovery proves futile.<br><br><br><br><b><center>******************** <p style="color:red">MODIS Aqua PM1ATTNR GBAD Data Gap: UPDATE 01.04.22</p> ********************</b></center><br><br>No additional L0 was received from EDOS and so MODAPS have closed this day. If an L0 is recieved in the future, this day will be revisited.<br><br> |
| AS_MYD_21357 | 2021-12-23 | 2021-12-29 | Closed | MODIS Aqua ASF Power Outage ASF UNP and AGS Gap On December 20th, 2021 (2021.354) a data gap occurred on Aqua MODIS due to a ASF power outage, which caused issues with ASF UNP and AGS. This resulted in a data loss from 354/08:16:12 - 354/11:43:25. Granules between 2021-12-20 08:20 and 11:44 were not produced. The gap occurred during daytime orbits over portions of Africa, the Middle East and Europe and night time orbits over North America and the Pacific Ocean. The images below shows this data gap for both day and night orbits. No further re-processing will take place, however recovery will be attempted in operational processing. This note will be updated when the missing data is recovered or when recovery proves futile.<br><br><br><br><b><center>******************** <p style="color:red">Aqua ASF Power Outage: UPDATE 12.29.21</p> ********************</b></center><br><br>No further input was received from EDOS and this data day was closed with the data gap as discussed in this note.<br><br> |
| AS_MYD_21278 | 2021-10-05 | 2021-10-05 | Note | Aqua Constellation Exit Users of MODIS Science data products are requested to note that MODIS Aqua is scheduled to exit the "Afternoon Constellation" of Earth Science satellites by February, 2023. The last of Aqua mission maneuver was done on March 18, 2021 to maintain the mean local time (MLT) of 01:30 PM and 705km altitude. Thereafter, Aqua has been drifting slowly from its MLT and will reach and exceed 01:45 PM MLT by February 2023, when it will make the constellation exit with a lowered orbit altitude. More information in this regard can be found <A href="https://modis.gsfc.nasa.gov/news/individual.php?news_id=100389"> here.</A><br><br>Please note that this does not indicate the end of life for Aqua mission and Aqua is expected to remain operational for at least another few more years and NASA SIPS will continue to produce and distribute science quality data through Fall of 2026. There may be some limited impact on the science data because of the changing MLT and the lowering of orbital altitude but overall, it is not expected to have any major impact on the science data quality.<br><br>We will continue to provide further updates in this regard as we get further inputs from the different land science teams.<br><br> |
| PM_MYD_21266 | 2021-09-21 | 2021-10-04 | Note | Lunar Deep Space Calibration (LDSC) Maneuver 2021.266 (09.23.21) An Aqua Lunar Deep Space Calibration (LDSC) maneuver occurred on 2021/266 (Sept 23, 2021) 09:12:28 - 09:52:25 UTC. The Cold Focal Plane Array (CFPA) temperatures take a long time to recover following such events and significant impacts on science data quality is expected. Thus, subsequent outage of science data is expected till FPA temperatures stabilize. Additionally, <A href="https://landweb.modaps.eosdis.nasa.gov/displayissue?id=265"> an NRT note has been posted</A>, which shows the significant impacts observed in the NRT products during this event.<br><br><br><br><br><b><center>************************************************ <p style="color:red">UPDATE 09.29.21</p> ************************************************</b></center><br>The instrument calibration team has confirmed that the nominal science data quality was restored for MODIS Aqua starting on 2021267:1800 (09.24.21). Due to this event, MODAPS will hide all science data between 2021266:08:50 (slew out time) through 2021267:1800 (science data quality restored). The images below show Aqua C6 L1B and the data gap from this event on DOY 266 and 267.<br><br><br><b><br><br><br><b> |
| PM_MYD_21240 | 2021-09-10 | 2021-09-10 | Note | Data loss due to contact error 2021.240 (08.28.21) On August 28th, 2021 (2021.240) a contact error occurred, which resulted in a nonrecoverable data loss for Aqua MODIS. The unrecoverable data loss impacts time 2021.240 (16:27:04 - 16:27:32), which occurred during a daytime time orbit over the Atlantic Ocean. The L1B emissive bands and geolocation were reviewed and granule 16:25 was directly impacted in the reflectance, thermal bands and geolocation information, but otherwise was found to be free of artifacts or corrupt data. Processing has been closed and the data is not recoverable. |
| PM_MYD_21227 | 2021-08-24 | 2021-08-25 | Note | Data loss due to contact error 2021.227 (08.15.21) On August 15th, 2021 (2021.227) a contact error occurred, which resulted in a nonrecoverable data loss for Aqua MODIS. The unrecoverable data loss impacts time 2021.227 (11:52:37 - 11:53:12), which occurred during a daytime time orbit over Africa. The L1B emissive bands, reflectance bands and associated geolocation were reviewed and granule 11:50 was directly impacted in the reflectance and thermal bands but otherwise found to be free of artifacts or corrupt data. Processing has been closed and the data is not recoverable. The first two images below show the L1B reflective band 2 and the associated geolocation information for granule 11:50. The impacted portion of the TOA reflectance band shows fill values 65535 as white and values of -999 in the geolocation. The third image shows the downstream reflectance MYD09 product for granule 11:50, where the data loss is observed in the RGB image as black stripes with a fill value of -28672.<br><br><br> |
| PM_MYD21_21200 | 2021-07-19 | 2021-08-09 | Note | Differences in heritage MODIS LST (MxD11) compared to MXD21 / VNP21 Users of the different MODIS and VIIRS LST products, generated by MODAPS and NASA LandSIPS, may notice more occurrences of extreme high temperature outliers in the MxD21 (C6/C61) and the VNP21 (C1 S-NPP VIIRS) products, compared to the heritage MxD11 LST products. To know more about this and the possible reason, please refer to<A href="https://landweb.modaps.eosdis.nasa.gov/data/userguide/High_Temps_MxD21_VNP21_gch.pdf"> this documentation.</A><br><br> |
| PM_MYD_21133 | 2021-05-19 | 2021-05-19 | Note | Data loss due to contact error 2021.133 (05.13.21) On May 13th, 2021 (2021.133) a contact error occurred, which resulted in a nonrecoverable data loss for Aqua MODIS. The unrecoverable data loss impacts time 2021.133 (14:58:47 - 15:01:19), which occurred during a daytime time orbit over the South Atlantic ocean, East of Angola and over open ocean. The L1B emissive bands and geolocation were reviewed and granules 14:55 and 15:00 were directly impacted in the reflectance and thermal bands but otherwise found to be free of artifacts or corrupt data. Processing has been closed and the data is not recoverable. The two images below show the L1B emissive band and geolocation information for granule 15:00, where the impacted portion of the thermal band shows fill values 65534 as white. The geolocation information was not impacted. |
| AS_MYD_22144 | 2022-05-24 | 2022-05-24 | Note | Aqua Data Outages Associated With MODIS Water Reservoir Product Gaps The dates listed below are associated with AQUA outages in which MODIS water reservoir products (MYD28) were not generated due to an issue with overlapping reservoir data. Roughly 1 in 5 reservoirs overlap two or more tiles. If any of that data is missing due to an outage or otherwise, the metrics would be underestimated. As a result, the PGE does not run for that period and data is not produced. The listed dates cannot and will not be re-generated in the future for this this collection, however a future collection may use a different PGE where this scenario is accounted for.<br><br><br><br><b><center>******************** <p style="color:blue">MAIAC Outage Events Concerning TERRA Products Can Be Found <a href="https://landweb.modaps.eosdis.nasa.gov/displayissue?id=22">HERE</a></p> ********************</b></center><br><br>MYD28C2 - 08/20/2020 (233)<br><br> |
| PM_MYD_20229c | 2020-12-01 | 2021-01-06 | Note | FMU Anomaly Recovery 2020.229 Aqua MODIS experienced permanent data loss for the period 8/16 - 9/2 from FMU anomaly on-board the spacecraft. <A href="https://landweb.modaps.eosdis.nasa.gov/displayissue?id=158"> Please refer to this note for more detail.</A> The Aqua FMU was reset on 9/2 and nominal science data was<A href="https://landweb.modaps.eosdis.nasa.gov/displayissue?id=157"> received thereafter.</A> Though Aqua only daily L1 and L2 granule products for this period were generated using the Direct Broadcast (DB) data, granule products are either partial or could not be generated since DB data did not provide full global coverage. In general, the Aqua coverage from DB inputs ranges between 20-30% within these days. Many daily tiled products could be missing and some could contain partial data. Similarly L3 n-day composite products may be missing or generated with less than ideal number of input data.<br><br>Example and explanation of the observation: <br>The first four images below from 2020-08-16 show the extent of global coverage that is to be expected from these L0 data that have been received from the Direct Broadcast stations. In general, the downstream L2, L3 daily images show N. America, Europe and the Indian sub-continent to have the most consistent coverage from day to day, with limited coverage over parts of S. America. The coverage over all other areas is sparse or non existent during this period.<br><br> |
| PM_MYD_20281 | 2020-10-15 | 2020-10-19 | Closed | L0 Data loss 2020.281 On October 7th, 2020 (2020.281) Aqua was found to be missing L0 data for day 281, from 11:55 - 13:15. The missing data has been successfully recovered from data provided through EDOS via Direct Broadcast (DB) stations. The image below shows the recovered data over Africa and Europe, which was previously missing in the daily land surface reflectance global browse image. |
| PM_MYD_20270 | 2020-09-29 | 2020-09-29 | Note | Data loss due to drop out 2020.270 On September 26th, 2020 (2020.270) a data drop out occurred in the Aqua MODIS L0 data. Reprocessing and station tape replay attempts for recovery were unsuccessful. The data has been determined to be non-recoverable. The data loss impacted granules 08:05 through 08:15 inclusive. This occurred during the 08:00 daytime orbit over the Indian Ocean and continuing through portions of India and Asia. The image below shows the impact form this data loss in the daily land surface reflectance global browse image. |
| PM_MYD_20229a | 2020-08-17 | 2020-11-02 | Note | FMU Anomaly Recovery 2020.229 Aqua MODIS suffered a science data outage, starting August 16th, 2020 (2020.229) at 09:26:40, because of a FMU/SSR error, the details of which can be found <A href="https://landweb.modaps.eosdis.nasa.gov/displayissue?id=157"> here.</A> The Aqua Flight Operations Team (FOT) worked closely with the different Instrument Operations Teams (IOTs) to resolve this and was able to recover the FMU/SSR, through a soft-reset on September 2, 21:00. During the entire data outage duration MODIS on-board Aqua was in good health acquiring science quality data as verified by the direct broadcast stations and during the reset process, MODIS was held in standby mode.<br><br> Following the reset on September 2 at 21:00, MODIS resumed nominal science data collection at 20:12 UTC. MODIS standard processing stream at MODAPS and the NRT processing streams successfully processed Aqua MODIS data. MODIS Calibration Support Team verified the RSB and TEB gain trending to be free of any impact from FMU anomaly, and the NASA MODIS geolocation team verified the geolocation accuracy to be nominal. All Aqua MODIS land and atmosphere products have been found to be satisfactory.<br><br>The level 0 data currently though not available for the anomaly period, EDOS is expected to coordinate recovery of the data for this period using the data received by the various Direct Broadcast (DB) stations. As it may take some time to receive and process DB data, to support data users near time needs MODAPS plans to generate the MODIS Terra+Aqua combined products using the Terra only data for the anomaly period (8/16 - 9/2) and later reprocess these products using the available Aqua MODIS data when data from DB stations become available for processing. The following plan has been proposed by the MODIS Land Team and LDOPE/MODAPS to resume the production of the Terra+Aqua MODIS combined land products as well as the MxD11 suite of LST products, from the anomaly period (8/16 - 9/2) :<br><br><br>**** Update 11/02/2020: **** <br><br>MODAPS has started to re-processing this Aqua FMU outage period (8/16 - 9/2), based on limited L0 coverage received from the various Direct Broadcast (DB) stations, via EDOS. The data from the DB stations are expected to cover between 25-30% of the globe each day. The status of this re-processing, as of 11/02/2020 is as follows:<br><br>1. All Aqua specific L2 and L3 dailies, for this outage period have now been re-processed in C6 forward production and the data should be available from the different DAACs.<br>2. The different Aqua specific n-day products are currently under review and once approved by LDOPE and the science teams, even those will be re-processed in C6 forward production.<br>3. Following #2, all Terra+Aqua combined products will be re-processed for this period and will be released to users, pending review and approval. Please note that at present, all the combined products, including the MCD43*, MCD18*, MCD19*, MCD15A2/A3, have been produced with Terra only inputs.<br><br> The images below from 2020-08-16 shows the extent of global coverage that is to be expected from these L0 data that have been received from the Direct Broadcast stations. In general, N. America, Europe and the Indian sub-continent shows the most consistent coverage from day to day, with limited coverage over parts of S. America. The coverage over all other areas is pretty erratic or non-existent, during this period.<br><br> |
| PM_MYD_20229 | 2020-08-17 | 2020-09-15 | Closed | FMU Anomaly 2020.229 On August 16th, 2020 (2020.229) at 09:26:40 Aqua received a yellow CDH alarm that was associated with a data value mismatch error and caused by data of incorrect length. MOT was unable to recover any data from the partitions 6,16, and 9 on the SSR. Partition 6 contains housekeeping and GBAD ephemeris and attitude data. Hence, this will affect the processing of the Aqua data on both <A href="https://landweb.modaps.eosdis.nasa.gov/displayissue?id=261"> NRT</A> and OPS streams, starting 2020.229 09:26:35, pending the resolution of this issue. This issue is currently under investigation and more information will be posted below to this note when available. The image below shows MODIS Aqua L1B reflectance for DOY 2020.229 where the data loss has impacted the global browse image for the majority of the day. |
| PM_MYD_20095 | 2020-04-23 | 2020-04-23 | Note | Data loss 2020.095 (04.04.20) On DOY 2020.095 (04.04.20), Aqua MODIS experienced a contact error event, which impacted the L1B data for granules 22:00 - 22:15. This data loss is unrecoverable for the period 095/22:02:19 - 095/22:17:09. The granules have been produced and contain striping where these data losses occurred in the L1B geolocation, reflectance, and thermal bands for granules 22:00 through 22:15. Detailed review of this data show the fill values associated with a data loss were assigned appropriately in the L1B geolocation, reflectance, and thermal bands. No corrupt data or artifacts were observed. Additionally, granules 22:00 through 22:10 occurred completely over open ocean during a daytime orbit in the Pacific Ocean and will not impact downstream land products.<br><br> Granule 22:15 is the only granule with retrieved land values that was impacted during this event. Granule 22:15 contains sever striping at the start of the granule, which is associated with the appropriate fill values for data loss in the geolocation, reflectance, and thermal values. The only portion of this granule 22:15, which covers land, is free of data loss and contains good values across all L1B layers. The images below show the L1B geolocation and RGB composite for granule 22:15, where the land values of coastal Alaska and British Columbia can be observed in the bottom left hand side of the granule and the stripes associated with data loss are observed at the top.<br><br> |
| PM_MYD_20119 | 2020-04-21 | 2020-04-21 | Note | AQUA Maneuver List The list below identifies all AQUA maneuver dates and granules (Start / End times) where granules were hidden due to poor geolocation accuracy. For more details please refer back to<A href="https://landweb.modaps.eosdis.nasa.gov/maneuver"> the Maneuver table.</A> <br><br><br><p><PRE>Year-Day Date Start Time (UTC)/ End Time (UTC) <br><br>2020 <br>2020-095 April 04, 2020 22:05 22:15 <br>2020-093 April 02, 2020 16:30 16:35 <br>2020-090 March 30, 2020 22:00 23:40 <br>2020-086 March 26, 2020 16:20 16:25 <br>2020-072 March 12, 2020 16:10 16:15 <br>2020-065 March 05, 2020 16:00 16:05 <br>2020-020 January 20, 2020 07:55 08:00 <br><br>2019 <br>2019-275 October 02, 2019 16:50 17:40 <br>2019-275 October 02, 2019 16:10 16:40 <br>2019-101 April 11, 2019 14:25 14:50 <br>2019-094 April 04, 2019 16:30 17:15 <br>2019-094 April 04, 2019 15:55 16:25 <br>2019-073 March 14, 2019 15:35 16:00 <br>2019-066 March 07, 2019 15:00 16:55 <br><br>2017 <br>2017-214 August 02, 2017 19:35 20:25 <br>2017-185 July 04, 2017 03:40 04:25 <br>2017-088 March 29, 2017 15:30 17:05 <br>2017-081 March 22, 2017 15:40 16:35 <br>2017-067 March 08, 2017 13:50 14:40 <br>2017-060 March 01, 2017 14:50 15:05 <br><br>2016 <br>2016-097 April 06, 2016 15:35 16:25 <br>2016-076 March 16, 2016 14:50 16:20 <br><br>2015 <br>2015-237 August 25, 2015 16:45 17:35 <br>2015-112 April 22, 2015 15:20 16:10 <br>2015-105 April 15, 2015 15:15 16:45 <br>2015-091 April 01, 2015 15:00 16:35 <br>2015-077 March 18, 2015 16:25 18:00 <br><br>2014 <br>2014-239 August 27, 2014 15:15 16:40 <br>2014-177 June 26, 2014 14:55 16:15 <br>2014-099 April 09, 2014 14:05 16:05 <br><br>2013 <br>2013-171 June 20, 2013 13:45 15:55 <br>2013-135 May 15, 2013 14:10 15:35 <br>2013-082 March 23, 2013 10:30 10:50 <br>2012-333 November 28, 2012 14:05 15:25 <br><br>2012 <br>2012-271 September 27, 2012 15:25 16:50 <br>2012-257 September 13, 2012 15:20 16:35 <br>2012-181 June 29, 2012 18:25 19:10 <br>2012-145 May 24, 2012 13:40 15:05 <br>2012-074 March 14, 2012 15:15 16:30 <br>2012-025 January 25, 2012 14:30 15:40 <br><br>2011 <br>2011-272 September 29, 2011 14:30 16:25 <br>2011-243 August 31, 2011 15:45 16:55 <br>2011-173 June 22, 2011 13:50 15:50 <br>2011-159 June 08, 2011 13:40 15:35 <br>2011-002 January 02, 2011 14:40 16:15 <br><br>2010 <br>2010-272 September 29, 2010 14:00 15:15 <br>2010-208 July 27, 2010 14:45 16:05 <br>2010-105 April 15, 2010 14:50 16:40 <br><br>2009 <br>2009-329 November 25, 2009 14:25 16:25 <br>2009-322 November 18, 2009 15:50 17:10 <br>2009-095 April 05, 2009 07:05 07:40 <br><br>2008 <br>2008-343 December 08, 2008 22:30 22:50 <br>2008-289 October 15, 2008 15:00 16:00 <br>2008-165 June 13, 2008 16:25 16:55 <br><br>2007 <br>2007-193 July 12, 2007 11:00 15:00 <br>2007-176 June 25, 2007 18:10 18:50 <br><br>2006 <br>2006-364 December 30, 2006 07:05 07:35 <br>2006-335 December 01, 2006 02:55 03:20 <br>2005-138 May 18, 2005 12:10 12:40 <br><br>2004 <br>2004-297 October 23, 2004 22:05 22:45 <br>2004-151 May 30, 2004 04:10 04:45 <br>2004-062 March 02, 2004 07:05 07:40 <br><br>2003 <br>2003-190 - 2003-191 July 09, 2003 - July 10, 2003 18:00 00:20 <br>2003-161 - 2003-162 June 10, 2003 - June 11, 2003 11:55 00:15 <br>2003-132 - 2003-133 May 12, 2003 - May 13, 2003 05:40 00:15 <br>2003-073 - 2003-074 Mar. 14, 2003 - Mar. 15, 2003 07:20 00:20 <br>2003-043 - 2003-044 Feb. 12, 2003 - Feb. 13, 2003 13:40 00:15 <br>2003-013 - 2003-014 Jan. 13, 2003 - Jan. 14, 2003 18:30 00:15 <br><br>2002 <br>2002-348 - 2002-349 Dec. 14, 2002 - Dec. 15, 2002 21:50 00:10 <br>2002-319 - 2002-320 Nov. 15, 2002 - Nov. 16, 2002 04:20 00:15 <br>2002-289 - 2002-290 Oct/ 16, 2002 - Oct. 17, 2002 14:05 00:20</PRE><br><br> |
| PM_MYD09_20010 | 2020-04-10 | 2020-05-28 | Note | MODIS aerosol quantity flag in error in C6, corrected in C61 The aerosol quantity flag in the C6 MODIS Surface Reflectance product (<A href="https://landweb.modaps.eosdis.nasa.gov/displayissue?id=86">MOD09</A>/MYD09) may have been in error and may not have correctly presented the spatial distribution of different aerosol quantities (low, average and high) over the globe. This is more relevant for areas with brighter surfaces and high-aerosols. This has been corrected in C61, using a new approach that is also consistent across the two sensors, MODIS Terra/Aqua and VIIRS S-NPP. Please note that the flag value corresponds to three level quantification of the uncertainty in aerosol correction to the surface reflectance. The new approach adopted in the C61 product only corrects the quantification of the aerosol correction impact and does not change the retrieved land surface reflectance (LSR) values. Any impact from this, on the downstream L3 dailies are minimal and are seen to produce small differences in the different "n-day" products that are dependent on LSR. For a more detailed discussion on the changes and impact on different downstream products please <A href="https://landweb.modaps.eosdis.nasa.gov/data/userguide/LSRHighAerosolFlagFinal.pdf">refer to the following document.</A><br><br>Examples below show RGB composite images of surface reflectance bands 1, 4 and 3 with areas flagged as high aerosol removed from the images: The images on the bottom are from the C61 surface reflectance product generated using the old approach to flag the aerosol (as in the C6 products) and the associated aerosol quantity. The images on the top are from the C61 surface reflectance product generated using the new approach to flag aerosols. Use of the new approach to flag aerosol results in fewer retrievals being flagged as high aerosol.<br><br><br> |
| PM_MYD_20090 | 2020-04-03 | 2020-04-07 | Closed | Data loss 2020.090 (03.30.20) On DOY 2020.090 (03.30.20), MODIS Aqua MYD00S data for granule 22:00 - 23:40 are missing due to a contact error. The original data loss included 090/22:05:39 - 090/23:37:27. This data is not recoverable and the day has been closed. The gap for this missing granule is observed during daytime orbit South of Alaska, and during a night time orbit extending over the Middle East and Africa. The examples below shows the MYD02 global browse image where the data gap is observed during both orbits. |
| PM_MYD03_20056 | 2020-02-25 | 2020-02-25 | Note | Aqua overpass time calculation error MODIS Aqua geolocation products in C6 and C61 have erroneous estimation of the equatorial overpass parameters for different orbits. Because of this, the reported metadata values of certain orbital parameters like 'EQUATORCROSSINGTIME', 'ORBITNUMBER', in the global file level attributes, are wrongly stated for the geolocation and all downstream swath products that reads the orbit overpass information from MYD03. The orbit overpass calculation is done independent of the actual geolocation process and this error does not have any impact on the Aqua geolocation or any other downstream science data products. The MODIS geolocation team is looking into this and a fix will be put in for both C6 and C61, once the source of the error has been identified. Please note that Terra geolocation does not have any such error and all equator overpass times are correctly stated in all Terra C6 and C61 products. The images below show an Aqua 5 minute orbit map, highlighting granule 12:10, an equatorial daytime overpass. The second image shows the recorded EQUATORCROSSINGTIME as 11:21:15, which is incorrect as the 11:20 granule for this day occurs during a night time orbit over the Pacific Ocean. |
| AS_MYD_22137 | 2022-05-17 | 2022-05-17 | Pending | MODIS AQUA Data Gap 2022.136 (05/16/22) Aqua MODIS is missing all data (L0 and downstream) for 05.16.2022 (2022136) between 16:48:32z - 18:29:18z due to an issue passing data to the ground station at 18:33z. As a result, granules 136/16:45z through 136/18:25z will show gaps. It is currently unknown whether this data can be recovered. The NRT note is also available at <a href="https://landweb.modaps.eosdis.nasa.gov/displayissue?id=257">this link</a>.<br><br> |
| PM_MYD_20043 | 2020-02-21 | 2020-02-21 | Note | Data loss Due to hung server issue 2020.043 On February 12th, 2020 (2020.043) the Aqua MODIS instrument experienced a hung server error in the ground system, which resulted in a small data gap in granule 17:10. The data has been lost and is not recoverable. The gap occurs during the start of a daytime orbit off the coast of Antarctica. The images below show granule 17:10 geolocation and L1B reflectance information where this gap occurs. This data loss will impact L1B and all downstream products.<br><br> |
| PM_MYD_19302 | 2019-11-05 | 2023-10-11 | Note | Semi-annual Night-time-day-mode calibration activity Rolling Note A routine calibration activity that happens every six months includes a portion of nighttime time data acquired in day mode and then a portion of day time data acquired in night mode. As a result, these periods include night time granules that contain a "day" flag during this calibration activity for granules over Africa. Additionally, granules appear missing in the global browse during the daytime time to compensate for the additional data in the buffer. The global browse image below shows an example of the impact from this calibration activity. This rolling note will document these semi annual occurrences.<br><br><br><br><b><center>************************************************ <p style="color:blue">Data users can access a complete entire mission list of all MODIS TERRA and AQUA Nighttime Day Mode Events, which includes this routine calibration activity<A href="https://mcst.gsfc.nasa.gov/modis-events-categories/routine-calibrations/nighttime-day-mode?event_date%5Bvalue%5D%5Byear%5D=2000&modis_mission=61"> HERE</A> </p> ************************************************</b></center><br><br><br><br><br><br> |
| PM_MYD_19284 | 2019-10-16 | 2019-10-23 | Note | Data loss Due to Contact Error 2019.284 On October 11th, 2019 (2019.284) the Aqua MODIS instrument experienced a contact error, which originally resulted in a data gap in granules 16:30 - 17:10. Data has since been partially recovered. As of 10.23.19 (2019.296), the data loss has been limited to granules 16:30 through 16:50, which mostly occurs during a night time orbit over the Antarctic through the start of a daytime orbit over South America. The first image below shows the Aqua MODIS global browse image where this gap is observed off the southern coast of South America. Additionally, granules 17:00 and 17:05 (over South America) have been found to contain a data gap in the L1B reflectance, emissive and geolocation information. Example images of these granules are also posted below.<br><br> |
| PM_MYD_19199 | 2019-07-26 | 2019-07-26 | Note | Data loss Due to Contact Error 2019.199 On July 19th, 2019 (2019.199) the Aqua MODIS instrument experienced a contact error, which resulted in a data gap in granule 23:25. Data is recoverable but has not been recovered. The images below shows the Aqua MODIS L1B geolocation and MYD021KM reflectance for granule 23:25, 2019.199. The data gap occurred during a daytime orbit over the Pacific Ocean. This note will be updated if the gap in the data is recovered.<br><br> |
| PM_MYD17_19088 | 2019-03-29 | 2019-03-29 | Note | MXD17A2H data discrepancies A few production periods of the MOD17A2H and MYD17A2H from the operational C6 processing have been identified as containing incomplete or corrupt data. These 8-day periods are listed below for each sensor. LDOPE is currently working with production to investigate, fix, and regenerate these periods. A global browse image below shows one example of the data discrepancy observed in the 17A2 archive. This note will be updated as more information becomes available.<br><br>MOD17A2H:<br>2018153<br>2017233<br>2016353<br>2016361<br>2001177<br><br>MYD17A2H:<br>2018161<br>2018153<br>2018145<br>2017217<br>2015345</A><br><br><br><br><br><br> |
| PM_MYD_18352 | 2018-12-27 | 2018-12-27 | Note | Aqua sector rotation 2018.352 (12.18.18) On December 18th, 2018 (2018.352) The Aqua MODIS instrument performed a sector rotation between 2018/352 13:05:39-13:09:25. During this period it was found that granule 13:05 contained a data gap in the emissive band and a small gap in the associated geolocation layer. This occurred during a night time orbit over the Pacific Ocean. The example images below show the L1B data emissive band 20 and the associated geolocation information. The data is not recoverable.<br><br> |
| PM_MYD02_18345 | 2018-12-11 | 2018-12-11 | Note | Known Issues affecting Aqua MODIS Instrument performance MCST (MODIS Calibration Support Team) tracks the prominent performance factors that complicate achieving optimum performance of the MODIS instrument, which are listed below. For a description of these effects, the projected impact on the L1B and L2 science, the instrument characteristic causing the effect, and the current mitigation strategy, access the following <A href="https://mcst.gsfc.nasa.gov/calibration/known-issues">MCST website LINK</A><br><br>Aqua known Issues:<br>- Non-functional or noisy Aqua detectors<br>- Incomplete Calibration for Band 21<br>- Thermal Leak (Band 5, 6, 7 & 26)<br>- Aqua Electronic cross-talk in Bands 5, 6, 7, & 26<br>- Band 33, 35, and 36 detector saturation<br>- Mis-registration between Aqua warm and cold focal planes.<br><br> |
| PM_MYD13_18304 | 2018-10-31 | 2018-10-31 | Note | Discrepancies in VI observed in 2012 leap second reprocessing On July 1st 2012, a routine leap second was added to the first granule of the day for C6 Aqua. <A href="https://landweb.modaps.eosdis.nasa.gov/displayissue?id=148">During this adjustment it was discovered that the process introduced an error</A>, which inadvertently shifted the time by one second following the leap second addition. A geolocation fix was implemented that corrected the leap second adjustment error and all L2 and L3 n-day data for this data day has been re-processed. However, reprocessing of the VI from this period to address the leap second issue on day 2012183 <A href="https://landweb.modaps.eosdis.nasa.gov/displayissue?id=177"> used the revised PGE versions, which were put into operation in the forward processing on day 2017241.</A> Therefore some temporal discontinuity in VI for all Aqua VI 16 day products that includes this data day (MYD13A1/A2/Q1) is expected. The example images below are global browse images of the VI from both current and prior PGE versions, which shows some slight discrepancies in vegetation across the globe. The spatial subset of the global browse image highlight the vegetation discrepancies along arid regions over the southern coast of Western Australia. <br><br><br> |
| PM_MYD11_18277 | 2018-10-05 | 2018-11-05 | Note | MYD11B1/B2 erroneous retrieval of day/night LST The Aqua MYD11B1/B2 products show erroneous retrieval of LST from day/night algorithm, with systematic gaps appearing in different tiles, on and after day 2018177 (06/26/2018). This issue is only seen to affect the LST from day/night combined algorithm and is seen for both daytime and nightime LST. The Land science team is still investigating the source of this error and the affected data will be re-processed once the a fix has been implemented. <br><br><br><br>****NOTE**** update 11.05.18: The issue was identified as the improper staging of the Aqua Update files. This has been addressed and the MYD11 day/night products have been nominal since day 298 of 2018. Re-processing of all the affected data from day 2018177 will be done for both Terra and Aqua.<br><br><br> |
| PM_MYD_18204 | 2018-07-23 | 2018-10-31 | Note | Leap second adjustment error 2012.183 (07.01.2012) On July 1st 2012, a routine leap second was added to the first granule of the day for C6 Aqua. During this adjustment it was discovered that the process introduced an error, which inadvertently shifted the time by one second following the leap second addition. This lead to a subsequent error in calculation of the pitch angle, and further analysis showed that this error also appeared in the Aqua attitude and ephemeris products. As a result, geolocation accuracy of all downstream land products for this day was impacted following the leap second adjustment. Impacts to the geolocation accuracy of land products were detected in the early orbits of day 2012.183 in the L1B geolocation and downstream products. The images below shows the geolocation verification that was performed for the Aqua MYD09GA h31v10 tile over Queensland Australia. The two maps show the projected tile and coastline of Australia for DOY 2012.183 and 2012.179, where a geolocation shift upwards of 7 to 8 kilometers can be observed on day 2012.183. The second image shows a nominally projected example of the same tile on 2012.179. This error will be resolved in future processing for Collection 6.1.<br><br><br>*****NOTE: All C6 products have been reprocessed for this Data Day 2012.183, including the N-day products from 8-day and 16-day products which include this data day within the production range. The reprocessed data includes a geolocation fix that has corrected the leap second adjustment error described above.<br><br><br> |
| AS_MYD_22126 | 2022-05-06 | 2022-05-18 | Closed | MODIS AQUA Data Gap 2022.125 (05/05/22) Aqua MODIS is missing all data (L0 and downstream) for 05.05.2022 (2022125) between 16:59:13z - 16:59:16z as well as 18:29:04z - 18:42:01z. As a result, granules 125/18:25z through 125/18:40z will show gaps. The reason for the missing data is currently unknown. The NRT note is also available at <a href="https://landweb.modaps.eosdis.nasa.gov/displayissue?id=256">this link</a>.<br><br><br><br><b><center>******************** <p style="color:red">MODIS Aqua Data Gap: UPDATE 05.18.22</p> ********************</b></center><br><br>The L0 data is not recoverable. The missing data was found to be caused by two consecutive short ground contacts on the spacecraft. This day is now closed.<br><br> |
| PM_MYD_18178 | 2018-07-03 | 2018-07-03 | Note | Data loss 2018.178 (06.27.18) On DOY 2018.178 (06.27.18) Aqua MYD00S data between 178/04:17:53 to 178/05:29:57 was impacted due to a contact error. The Aqua Data Loss is recoverable but has not yet been recovered. The data loss is observed in a daytime orbit over Australia and southeast Asia. The gap in the L1B archive includes granules 04:10 through 05:20, which are missing. The images below shows L1B geolocation and reflectance data from granule 05:25, which was produced but found to contain corrupt geolocation and reflectance data. |
| PM_MYD_18101 | 2018-04-19 | 2018-04-19 | Note | Data loss during due to contact error 2018.101 A MODIS Aqua data loss occurred on 2018.101 between 09:34:57 and 09:36:20 GMT. The data loss occurred during a daytime orbit over Northern Russia. The geolocation information was impacted in granules 09:30 and 09:35, and a stripe of fill value 65533 was observed in the reflectance bands of granule 09:35. The data loss was due to a contact error and is recoverable, but has not been recovered. Below are example images of the geolocation and associated reflective bands for granule 09:35, which show the data loss and the impacted geolocation information and reflectance bands. |
| PM_MYD16_18074a | 2018-03-15 | 2018-03-15 | Closed | C6 Evapotranspiration product MYD16A2 from years 2002, 2005 through 2008 are not science quality The C6 8-day composite Aqua MODIS Evapotranspiration product MYD16A2 from the mission years 2002, and 2003 through 2008 have been verified to be bad and not usable in any applications. Product from these years contains fill values for all pixels. The source of the issue has been traced to some production error. Following example shows the global browse image of the product from the first 8-day period of 2003 and 2005. Browse image from 2003001 shows valid retrievals at expected while the image of product from day 2005001 shows different fill values from the set of fill values used in the product.<br><br><br>Note: This product has been reprocessed for these years at MODAPS using the consistent version of the C6 PGE and have been made available as of April 24th, 2018.<br><br> |
| PM_MYD16_18074 | 2018-03-15 | 2018-03-15 | Pending | Using the QA dataset in the Terra and Aqua ET product The pixel level QA dataset ET_QC_500m is a copy of the pixel level QA of in the input 8-day composite LAI-FPAR product (MxD15A2) and does not reflect the quality of the retrieved Evapotranspiration. The current operational C6 version of the process does not generate pixel level science quality information. Users are advised to exercise caution while using the product in their application. Because of this user may also find Pixels with fill values being flagged as qualified retrievals. Also in some cases user may find retrievals with value attributed to barren land where the underlying land cover could be a vegetated area like forest.<br><br> |
| PM_MYD_18056 | 2018-02-28 | 2018-02-28 | Note | Data loss during AQUA Roll Maneuver 2018.056 During the AQUA lunar calibration roll maneuver on 2018.056 (02.25.18) a L1B granule (23:35) was found to contain a data loss in the thermal emissive bands and a geolocation artifact. Additionally, the granule was flagged incorrectly as 'both' during this night time orbit period. Below are example images of the geolocation and associated thermal emissive bands, which show the data loss and the impacted geolocation information. This occurred during a night time orbit over eastern europe. |
| PM_MYD_18004 | 2018-02-15 | 2018-02-15 | Note | Data loss due to DCR 2018004 (01/04/18) A MODIS Aqua data loss occurred on 2018.004 (01.04.18) between the 04:45 and 04:50 granules. Several Aqua MODIS bands experienced a DCR change followed by several lost-packets and anomalous scans in the 2018.004.0445 granule. Additional artifacts are also observed in the 2018.004.0450 granule. This occurred during a daytime orbit over the antarctic and impacted a number of scans in both the reflective and emissive bands. Below are some example images showing the various impacts from this event.<br><br><br> |
| PM_MYD_17354 | 2017-12-22 | 2017-12-22 | Note | Data loss due to Contact error on 2017354 (12/20/17) A MODIS Aqua data loss occurred on 2017.354 between 00:52:46 and 01:12:30. The gap is observed as a gap during a daytime orbit over the Pacific Ocean. The data loss is due to a contact error and is recoverable, but has not been recovered, this note will be updated when more information on recovery becomes available.<br><br><br> |
| PM_MYD21_17304 | 2017-10-31 | 2017-10-31 | Pending | Higher than expected temperatures over high humidity regions The MxD21 products were found to contain higher than normal LST values for areas with high humidity conditions, a result of lower than expected emissivities in band 31 retrieved for these area. This has been traced to a potential coding error in interpolation of the WVS coefficients. The issue might have also propagated to the downstream L3 LST daily and 8-day composite products (MxD21A1/ MxD21A2). <br><br>Note: This issue will be addressed in the upcoming C61 reprocessing.<br><br> |
| PM_MYD13_17242 | 2017-08-30 | 2017-10-02 | Note | Improvement to VI in forward processing starting data day 2017241 A revised version of the VI PGEs, PGE25(6.0.34)/PGE35(6.0.23), with changes in the science processing software to address following issues were put in the C6 forward processing on data day 2017241.<br>- Missing large swath of data (GAPS) in the 250m & 500m records especially in the last cycles of each year (due to staging errors and a Code bug that did not capture the staging issue)<br>- VI usefulness bit reset<br>- High spikes or No Data in the 250m record<br><br><br>The VI suite of products in the forward processing from data day 2017241 onwards could have differences compared to the product from the prior period of the mission. The difference would be in the form of<br>- 250m fill values minimized<br>- Most spikes are removed, though some remain in the data due to the use of pre-composited 8day input files <br>- Change in near about 10 to 20 percent of the global retrievals <br>- Overall a slight increase in NDVI and EVI values, with relative difference being less than 1%<br>- Decrease in percent clouds<br>- Compositing day remains for the most part the same<br><br><br> |
| PM_MYD_17163 | 2017-06-13 | 2017-06-13 | Note | recoverable Data loss 2017.163(06.12.17) A MODIS Aqua data loss occurred on 2017.163 (06.12.17) between 18:41:26 and 19:56:58. The loss is observed as a gap during a nighttime orbit over Asia. The data loss is due to a playback error and is recoverable, but has not been recovered. This note will be updated as more information is received on the data recovery.<br><br> |
| AS_MYD_22123 | 2022-05-03 | 2022-05-16 | Closed | MODIS AQUA Data Gap 2022.121 (05/01/22) Aqua MODIS is missing all data (L0 and downstream) for 05.01.2022 (2022121) between 15:52z and 17:26z. As a result, granules 121/15:50z through 121/17:25z will show gaps. The reason for the missing data is currently unknown. The NRT note is also available at <a href="https://landweb.modaps.eosdis.nasa.gov/displayissue?id=255">this link</a>.<br><br><br><br><b><center>******************** <p style="color:red">MODIS Aqua Data Gap: UPDATE 05.16.22</p> ********************</b></center><br><br>The cause of the data gap was determined to be a data hit during the satellite playback. The L0 data is considered recoverable but will not be recovered. This day is now closed.<br><br> |
| PM_MYD21_17159a | 2017-06-08 | 2017-06-08 | Note | Difference between MERRA based and NCEP based LST Processing of operational C6 LST product MOD21 and MYD21 at MODAPS (and the product available to public from LPDAAC and LAADS) is expected to lag by 1-2 months as the MERRA2 ancillary input used in the processing of the product is available 1-2 month later. However for near real time use the same product is generated using NCEP as ancillary by the MODAPS-NRT processing system and is distributed to public by the LAADS-NRT rolling archive which will only archive the data for the latest two months of the mission. User should expect difference in the LST at pixel level from these two versions of the product because of difference in the accuracy of the daily atmosphere profiles and the difference in resolution of these two ancillary data source. Additionally, users are recommended not to mix the two versions (NCEP-based and MERRA2-based) of LST products in their analysis because the difference in LST from these two version of products can be as large as 5-10 degrees K over some areas.<br><br> |
| PM_MYD_17031 | 2017-01-31 | 2017-01-31 | Note | Data loss due to Contact error on 2017031 (01/31/17) A MODIS Aqua data loss occurred on 2017.031 between 08:45:53 and 08:56:26. The gap is observed as a gap during a daytime orbit over Asia. The data loss is due to a contact error and is recoverable, but has not been recovered. The images below show the data gap over Asia. |
| PM_MYD_17001 | 2017-01-01 | 2017-01-01 | Note | Leap second added 2017.001 On January 1st 2017, a leap second was added to the first granule of the year for both Terra and Aqua. As a result, the geolocation accuracy may be slightly impacted following the leap second adjustment. However, impacts to land products will be minimal as the addition of the leap second occurred in granules during night time acquisition or over the ocean and the acquisiton over land occurred about an hour later when geolocation accuracy has reached the stable acceptable error limit. The image below shows the profile of latitude in the track direction for a detector/observation around nadir. The x axis shows the line number and y axis is the latitude for the corresponding line and sample. The gap in the latitude corresponds to the 1-sec of data removed from processing (leap second insertion). The profile prior to and after the 1-sec adjustment show a small difference in the slope. This difference is expected to taper off over one or two orbits.<br><br> |
| PM_MYD_16361 | 2016-12-28 | 2016-12-28 | Note | Data loss due to a contact error 2016261 (12/26/16) A MODIS Aqua data loss occurred on 2016.261 between 19:08:31 and 20:50:46. The gap is due to a contact error and is observed during daytime orbits over the Americas and night time orbits over Asia. This data is recoverable and recovery is in progress. The image below shows the data loss in the global browse image for MYD02, day 2016361. |
| PM_MYD_16319 | 2016-11-19 | 2016-12-14 | Note | Night time granules labeled as day during AQUA Roll Maneuver During routine AQUA roll maneuvers a portion of night time data are flagged incorrectly as day time granules. This may result in incorrect downstream values in the snow and fire products. This note will document the incorrectly flagged granules detected during the AQUA roll maneuvers.<br><br> Aqua MLC #145 DOY: 2016.315, granules 18:10, 18:15 flagged as 'both'<br> Aqua MLC #146 DOY: 2016.345, granules 01:45, 01:50 flagged as 'both'<br><br> |
| PM_MYD03_16281 | 2016-10-14 | 2016-10-14 | Note | Aqua geolocation loss 2016.281 There was a geolocation data loss in the C6 MYD03 geolocation data for granules 20:55 on data day 2016.281. The data loss occurred during a daytime orbit passing over North America. The first image below shows the L1B granule 20:55, and the second image shows the corresponding latitude information with the data loss. |
| PM_MYD_16278 | 2016-10-04 | 2016-10-04 | Note | Data loss due to Contact error on 2016278 (10/04/16) A MODIS Aqua data loss occurred on 2016.278 between 07:06:29 and 07:10:29. The gap is observed as stripes during a daytime orbit over Southern China. The data loss is due to a contact error and is recoverable, but has not been recovered. The images below show the L1B and associated geolocation for granule 07:05, where the data loss can be seen as stripes. |
| PM_MYD03_16214 | 2016-08-22 | 2016-08-22 | Note | Aqua geolocation anomaly 2016.214 There was a geolocation data anomaly in the C5 and C6 MYD03 geolocation data for granule 02:05 on data day 2016.214. This granule covers a daytime orbit over the Pacific Ocean. The first image below shows the L1B granule, and the second image shows the corresponding longitude data with the data anomaly. |
| PM_MYD_16208 | 2016-07-26 | 2016-07-26 | Note | Data loss due to Contact error on 2016208 (07/26/16) A MODIS Aqua data loss occurred on 2016.208 between 03:09:44 and 04:30:38. The gap is observed during a daytime orbit over Australia, the Pacific Islands, and Eastern Asia. The data loss is due to a contact error. This data is recoverable but has not been recovered. The image below shows the non-recoverable data loss in the global browse image for MYD09, day 2016208. |
| PM_MYD03_16173 | 2016-07-20 | 2016-07-20 | Note | Aqua geolocation loss 2016.173 There was a geolocation data loss in the C5 and C6 MYD03 geolocation data for granules 23:30 and 23:35 on data day 2016.173. The data loss occurred during a daytime orbit passing over the Pacific Ocean. The first image below shows the L1B granule 2335, and the second image shows the corresponding latitude data with the data loss. |
| AS_MYD_22091 | 2022-04-01 | 2022-04-19 | Pending | MODIS AQUA Safe Mode Anomaly 2022.090 (03/31/22) On 03/31/22 at 090/17:59:08z, the power controller (PC) of the Aqua spacecraft swapped to the redundant B side, resulting in Aqua transitioning to Safe State. As a result, MODIS is in the expected safe mode configuration with all doors closed and the scan mirror not rotating. CP and FP are on. No science data is being produced while the S/C is in Safe State. The cause of the anomaly is under investigation, but it is suspected that increased solar flare activity may have triggered the anomaly as the transition to Safe Mode occurred over the South Atlantic Anomaly (SAA). The exact timeline of the recovery plan will be posted when available. Additional images are available in the <a href="https://landweb.modaps.eosdis.nasa.gov/displayissue?id=254">NRT note</a>.<br><br><br><br><b><center>******************** <p style="color:red">Aqua Safe Mode Anomaly: UPDATE 04.05.22</p> ********************</b></center>The tentative date for recovery to science mode is 04/14/2022 (2022104) and instrument recovery will follow. This note will be updated once the timeline is finalized.<br><br><br><br><b><center>******************** <p style="color:red">Aqua Safe Mode Anomaly: UPDATE 04.13.22</p> ********************</b></center><br><br>The status of PC-A was investigated on April 7, 2022 (097) and was deemed to be healthy. This led to the decision to switch back to PC-A, which has been used throughout the mission. This switch to PC-A has been done as of 04/13/2022 06:23z and the S/C is out of safe mode, though the MODIS instrument continues to be in safe mode. The instrument may come back to science mode by the evening of 04/14/2022 and science data acquisition may resume by late 04/14/2022, however that data will not be usable until all onboard gain states are restored and both the blackbody and the CFPA cool down to nominal levels. More details will be provided with an update provided by MCST and IOT in the coming days however fully nominal science data is not expected to start coming in util the week of 04/18/2022.<br><br><br><br><b><center>******************** <p style="color:red">Aqua Safe Mode Anomaly: UPDATE 04.15.22</p> ********************</b></center><br><br>Aqua FOT has led the recovery of the S/C from safe mode to science mode and MODIS IOT has commanded the instrument into science mode as well. The estimated beginning time of the science data collect is 105/00:38, however, all data collected during DOY 105 will be in night rate. The instrument and focal plane temperatures will recover over the next 36 to 48 hours before a return to nominal operations. Over the next several days, MCST will perform an intensive evaluation of the instrument's health and performance and the assessment will be shared in the near future.<br><br><br><br><b><center>******************** <p style="color:red">Aqua Safe Mode Anomaly: UPDATE 04.18.22</p> ********************</b></center><br><br>Aqua MODIS was transitioned back to Science Mode on Thursday, April 14th, at which time the BB heater was turned on and the CFPAs began cooling towards their temperature set points. The FPA temperatures have stabilized as of 2022/107 03:00 (April 17) and nominal data acquisition has begun since April 17. Both NRT and standard products are being generated at MODAPS and data products exported to the DAACs. This note will recieve a final update once it has been confirmed that the produced products meet standards else they may be re-processed.<br><br> |
| PM_MYD35_16152 | 2016-05-31 | 2016-05-31 | Note | Possible degradation of Cloud Mask, user discretion advised Cloud Mask product uses daily NISE (Near Real Time ice and snow extent) data as input seed for global ice concentration and snow extent. NISE data from day 096 of 2016 (4/5) may have been degraded as posted by the data center at this url (http://nsidc.org/data/search/#keywords=NISE/sortKeys=score,,desc/facetFilters=%257B%257D/pageNumber=1/itemsPerPage=25). Though visual inspection of the cloud product do not reveal any obvious quality issues in the cloud mask, users are advised to exercise caution while using the product in their application. All downstream land products may be affected by degradation in the Cloud Mask. |
| PM_MYD11_16083 | 2016-03-23 | 2016-03-23 | Note | Difference in LST from use of C6 snow prior to 06.18.2011 There could be some minor difference in LST from the use of the C6 snow as input in place of the C52 snow. This occurs from the start of the mission up until 06.17.2011. AQUA LST started using v6.4.14 on 06.18.2011.<br><br><br><br> |
| PM_MYD_14160 | 2014-06-09 | 2014-06-09 | Pending | Incorrect production date time in LOCALGRANULEID and PRODUCTIONDATETIME metadata The metadata 'PRODUCTIONDATETIME' and the production date time field in the metadata 'LOCALGRANULEID' of MODIS L1B, Atmosphere and Land data products may be incorrect in some of the data granules where PRODUCTIONDATETIME seems to be behind the DATA ACQUISITION TIME by several hours. The problem has been traced to incorrect unix system clocks in some of the minions used in the data processing at MODAPS. The metadata PRODUCTIONDATETIME stores the time when the granules were made at MODAPS and will not otherwise decide quality of the product or the sequence in which the products are generated and processed at MODAPS, and hence will not have any impact on data quality. At this time there is no plan to fix these metadata error.<br><br>Example: Metadata LOCALGRANULEID from file MYD021KM.A2014060.1555.005.2014061165557.hdf seems to indicate that granule acquired at 15:55 GMT on March 01 of 2014 has been processed earlier to the data acquisition, i.e. processed at time 07:56:00 on the same day.<br><br>LOCALGRANULEID: MYD021KM.A2014060.1555.005.2014061165557.hdf <br>PRODUCTIONDATETIME: 2014-03-02T16:55:57.00<br><br><br><br> |
| CC_MYD07_13340 | 2013-12-06 | 2013-12-06 | Pending | Top levels of some profile data are all fill Some of the C6 MYD07 moisture profile data are all fill for the top layers. This is not the case for the equivalent C5. The first four images below show the four top layers (05, 10, 20, and 30 hPa) of the dew point profile from MYD07 for granule 2003012 01:20. All pixels are black, indicating fill values. The second set of four images shows the equivalent set of dew point profile layers for the same granule from C5. Valid data are present in C5, but not in C6. Rainbow scale indicates temperature range from 190K (violet) to 235K (red). Black indicates fill values.<br><br>Fill values in the atmospheric profiles causes failure of the LST retrieval developed by Simon Hook, so these LST retrievals are not made for granules where any profile levels are all fill. |
| AS_MYD_22076 | 2022-03-17 | 2022-03-18 | Closed | MODIS AQUA Ephemeris Input Data Gap 2022.075 (03/16/22) Aqua MODIS is missing ephemeris inputs (MYDGBAD) for 03.16.2022 (2022075) between 09:16z and 11:05z. As a result, MYD021KM L1B will show gaps for granules 075/09:20z through 075/11:10z. The reason for these missing inputs is currently unknown. Furthermore, the missing attitude data is halting production around 06:00z for this day. This note will be updated once further updates are available.<br><br><br><br><b><center>******************** <p style="color:red">Aqua Ephemeris Input Data Gap: UPDATE 03.18.22</p> ********************</b></center><br><br>The granules affected have not been recovered, however, production is moving forward for this day.<br><br> |
| AS_MYD_22054 | 2022-02-23 | 2022-04-05 | Closed | MODIS Aqua FMU SSR Sub-Module Anomaly Since February 22nd, 2022 (2022.053), an FMU/SSR anomaly began to affect Aqua MODIS in which 17-19 seconds of Aqua's high rate science data (MODIS/AIRS) is corrupted approximately every two orbits (roughly every 3 hours 28 minutes and 15 seconds 03:28:15). The images below shows this data gap for the daytime orbit, nighttime orbit, and a magnified view of this anomaly. The FOT is in the process of putting a plan of action together to address the corrupted sub-module, but before recovery takes place, the memory will suffer about seven losses per day or 133 seconds of high rate science data. Futher images are available in the <a href="https://landweb.modaps.eosdis.nasa.gov/displayissue?id=252">NRT note</a>.<br><br>A list of affected times includes:<br><br>February 22, 2022<br>053/07:43:01z - 07:43:18z / 17 seconds - Antarctica<br>053/11:11:17z - 11:11:36z / 19 seconds - Southwestern Africa<br>053/14:39:33z - 14:39:52z / 19 seconds - Northeastern Africa<br>053/18:07:50z - 18:08:09z / 19 seconds - Hudson Bay, Canada<br>053/21:44:28z - 21:45:17z / 49 seconds - Kazakhstan (night data)<br><br>February 23, 2022<br>054/01:30:19z - 01:31:08z / 49 seconds - South Pacific (night data)<br>054/05:03:38z - 05:03:56z / 18 seconds - Antarctica<br>054/08:31:55z - 08:32:14z / 19 seconds - South Indian Ocean<br>054/12:00:13z - 12:00:30z / 17 seconds - Mid-Africa<br>054/15:28:28z - 15:28:47z / 19 seconds - Northern Atlantic Ocean<br>054/18:56:51z - 18:57:40z / 49 seconds - Northeastern Russia (night data)<br>054/22:42:45z - 22:43:34z / 49 seconds - Southwest Africa (night data)<br><br>February 24, 2022<br>055/02:24:16z - 02:24:36z / 20 seconds - Antarctica<br>055/05:52:33z - 05:52:52z / 19 seconds - South Indian Ocean<br>055/09:20:49z - 09:21:08z / 19 seconds - Indian Ocean<br>055/12:49:06z - 12:49:25z / 19 seconds - Northern Africa<br>055/16:17:22z - 16:17:41z / 19 seconds - West of Northern Canada<br>055/19:55:06z - 19:55:55z / 49 seconds - Central China (night data)<br>055/23:40:59z - 23:41:48z / 49 seconds - North of Antarctica (night data)<br><br>February 25, 2022<br>056/03:13:11z - 03:13:30z / 19 seconds - Antarctica<br>056/06:41:29z - 06:41:47z / 18 seconds - Western Australia<br>056/10:09:46z - 10:10:04z / 18 seconds - Midwestern Africa<br>056/13:38:03z - 13:18:21z / 18 seconds - Northeast of France<br>056/17:07:34z - 17:08:23z / 49 seconds - North of Alaska (night data)<br>056/20:53:25z - 20:54:14z / 49 seconds - Indian Ocean (night data)<br><br>February 26, 2022<br>057/00:33:50z - 00:34:08z / 18 seconds - Antarctica<br>057/04:02:07z - 04:02:26z / 19 seconds - South of Australia<br>057/07:30:23z - 07:30:42z / 19 seconds - East of Indonesia<br>057/10:58:39z - 10:58:58z / 19 seconds - Northwestern Africa<br>057/14:26:56z - 14:27:13z / 17 seconds - South of Greenland<br>057/18:05:44z - 18:06:33z / 49 seconds - Eastern China (night data)<br>057/21:51:37z - 21:52:27z / 50 seconds - North of Antarctica (night data)<br><br>February 27, 2022<br>058/01:22:44z - 01:23:02z / 18 seconds - North of Antarctica<br>058/04:51:01z - 04:51:19z / 18 seconds - Central Australia<br>058/08:19:17z - 08:19:36z / 19 seconds - Southern India<br>058/11:47:35z - 11:47:54z / 19 seconds - Germany/Poland<br>058/15:18:09z - 15:18:59z / 50 seconds - North of Alaska (night data)<br>058/19:04:03z - 19:04:52z / 49 seconds - Indian Ocean (night data)<br>058/22:43:22z - 22:43:42z / 20 seconds - Antarctica<br><br>February 28, 2022<br>059/02:11:39z - 02:11:56z / 17 seconds - New Zealand<br>059/05:39:55z - 05:40:13z / 18 seconds - South of Malaysia<br>059/09:08:11z - 09:08:29z / 18 seconds - Iran/Afghanistan<br>059/12:36:26z - 12:36:46z / 20 seconds - Northeast of Iceland<br>059/16:16:21z - 16:17:10z / 49 seconds - West of Japan (night data)<br>059/20:02:15z - 20:03:04z / 49 seconds - Antarctica (night data)<br>059/23:32:15z-23:32:34z / 19 seconds - North of Antarctica<br><br>March 01, 2022<br>060/03:00:32z - 03:00:51z / 19 seconds - West of Australia<br>060/06:28:49z - 06:29:08z / 19 seconds - Thailand<br>060/09:57:06z - 09:57:25z / 19 seconds - Eastern Russia<br>060/13:28:43z - 13:29:32z / 49 seconds - North of Alaska (night data)<br>060/17:14:34z - 17:15:23z / 49 seconds - Australia (night data)<br>060/20:52:54z - 20:53:12z / 18 seconds - Antarctica<br><br>March 02, 2022<br>061/00:21:11z - 00:21:29z / 18 seconds - South Pacific<br>061/03:49:26z - 03:49:44z / 18 seconds - Papua New Guinea<br>061/07:17:44z - 07:18:01z / 17 seconds - Tibet<br>061/10:46:00z - 10:46:18z / 18 seconds - North of Norway<br>061/14:26:57z - 14:27:46z / 49 seconds - Central Pacific (night data)<br>061/18:12:48z - 18:13:37z / 49 seconds - Antarctica (night data)<br>061/21:41:46z - 21:42:05z / 19 seconds - North of Antarctica<br><br>March 03, 2022<br>062/01:10:04z - 01:10:23z / 19 seconds - South Pacific<br>062/04:38:20z - 04:38:38z / 18 seconds - Philippine Sea<br>062/08:06:37z - 08:06:54z / 17 seconds - Central Russia<br>062/11:39:15z - 11:40:05z / 50 seconds - Western Canada (night data)<br>062/15:25:08z - 15:25:58z / 50 seconds - Australia (night data)<br>062/19:02:25z - 19:02:43z / 18 seconds - Antarctica<br> 062/22:30:42z - 22:30:59z / 17 seconds - South Pacific<br><br>March 04, 2022<br>063/01:58:58z - 01:59:16z / 18 seconds - South Pacific Ocean<br>063/05:27:14z - 05:27:34z / 20 seconds - Central China<br>063/08:55:31z - 08:55:50z / 19 seconds - North of Russia<br>063/12:37:30z - 12:38:19z / 49 seconds - South of Hawai'i (night data)<br>063/16:23:03z - 16:23:21z / 18 seconds - Antarctica<br>063/19:51:18z - 19:51:37z / 19 seconds - West of Chile<br>063/23:19:35z - 23:19:54z / 19 seconds - South Pacific<br><br>March 05, 2022<br>064/02:47:52z - 02:48:10z / 18 seconds - Middle Pacific<br>064/06:16:07z - 06:16:26z / 19 seconds - Central Russia<br>064/09:49:53z - 09:50:42z / 49 seconds - Central Canada (night data)<br>064/13:35:47z - 13:36:36z / 49 seconds - New Zealand (night data)<br>064/17:11:56z - 17:12:15z / 19 seconds - North of Antarctica<br>064/20:40:12z - 20:40:32z / 20 seconds - South Pacific<br><br>March 06, 2022<br>065/00:08:29z - 00:08:48z / 19 seconds - South of Hawai'i<br>065/03:35:17z - 03:37:04z / 108 seconds - Japan<br>065/03:43:30z - 03:44:32z / 62 seconds - Russia<br>065/07:05:02z - 07:05:21z / 19 seconds - North of Russia<br>065/10:48:03z - 10:48:52z / 49 seconds - Central Pacific (night data)<br>065/14:32:32z - 14:32:52z / 20 seconds - Antarctica<br>065/18:00:49z - 18:01:07z / 18 seconds - East of Argentina<br>065/21:29:05z - 21:29:23z / 18 seconds - South Atlantic<br><br>March 07, 2022<br>066/00:57:22z - 00:57:39z / 17 seconds - Central Pacific<br>066/04:25:38z - 04:25:56z / 18 seconds - Central Russia<br>066/08:00:21z - 08:01:10z / 49 seconds - North of Antarctica (night data)<br>066/08:58:35z - 08:58:57z / 22 seconds - Indian Ocean<br>066/11:46:14z - 11:47:04z / 50 seconds - West of New Zealand (night data)<br>066/15:21:27z - 15:21:45z / 18 seconds - Antarctica<br>066/18:49:43z - 18:50:01z / 18 seconds - Argentina<br>066/22:18:00z - 22:18:17z / 17 seconds - East of Hawai'i<br><br>March 08, 2022<br>067/01:46:16z - 01:46:34z / 18 seconds - North Pacific<br>067/05:14:32z - 05:14:50z / 18 seconds - North of Russia<br>067/08:58:35z - 08:59:24z / 49 seconds - South Pacific (night data)<br>067/12:42:03z - 12:42:22z / 18 seconds - Antarctica<br>067/16:10:20z - 16:10:39z / 19 seconds - South of South America<br>067/19:38:36z - 19:38:54z / 18 seconds - West of Peru<br>067/23:06:52z - 23:07:10z / 18 seconds - North of Hawai'i<br><br>March 09, 2022<br>068/02:35:09z - 02:35:26z / 17 seconds - Eastern Russia<br>068/06:10:56z - 06:11:46z / 50 seconds - North of Nova Scotia (night data)<br>068/09:56:48z - 09:57:37z / 49 seconds - South Pacific (night data)<br>068/13:30:56z - 13:31:15z / 19 seconds - North of Antarctica<br>068/16:59:12z - 16:59:32z / 20 seconds - Southern Brazil<br>068/20:27:30z - 20:27:48z / 18 seconds - Central America<br>068/23:55:47z - 23:56:04z / 17 seconds - South of Alaska<br><br>March 10, 2022<br>069/03:24:02z - 03:24:21z / 19 seconds - North of Russia<br>069/07:09:08z - 07:09:57z / 49 seconds - West of Peru (night data)<br>069/10:51:34z - 10:51:53z / 19 seconds - Antarctica<br>069/14:19:50z - 14:20:10z / 20 seconds - South Atlantic<br>069/17:48:07z - 17:48:24z / 17 seconds - Brazil<br>069/21:16:23z - 21:16:41z / 18 seconds - West of Mexico<br><br>March 11, 2022<br>070/00:44:39z - 00:44:59z / 20 seconds - Eastern Russia<br>070/04:21:31z - 04:22:21z / 50 seconds - Northern Atlantic (night data)<br>070/08:07:22z - 08:08:12z / 50 seconds - Southern Pacific (night data)<br>070/11:40:27z - 11:40:46z / 19 seconds - North of Antarctica<br>070/15:08:45z - 15:09:02z / 17 seconds - Southern Atlantic<br>070/18:37:01z - 18:37:19z / 18 seconds - North of Colombia<br>070/22:05:17z - 22:05:35z / 18 seconds - West of Canada<br><br>March 12, 2022<br>071/01:33:47z - 01:34:37z / 50 seconds - Arctic Ocean<br>071/05:19:38z - 05:20:28z / 50 seconds - Brazil (night data)<br>071/09:01:05z - 09:01:22z / 17 seconds - Antarctica<br>071/12:29:21z - 12:29:39z / 18 seconds - South of South Africa<br>071/15:57:37z - 15:57:57z / 20 seconds - Eastern Brazil<br>071/19:25:55z - 19:26:14z / 19 seconds - Central United States<br>071/22:54:13z - 22:54:31z / 18 seconds - North of Alaska<br><br>March 13, 2022<br>072/02:32:07z - 02:32:56z / 49 seconds - Morocco (night data)<br>072/06:17:58z - 06:18:47z / 49 seconds - North of Antarctica (night data)<br>072/09:50:00z - 09:50:20z / 20 seconds - North of Antarctica<br>072/13:18:17z - 13:18:35z / 18 seconds - West of Namibia<br>072/16:46:33z - 16:46:52z / 19 seconds - East of Leeward Islands<br>072/20:14:50z - 20:15:09z / 19 seconds - Western Canada<br>072/23:44:27z - 23:45:16z / 49 seconds - North of Russia (night data)<br><br>March 14, 2022<br>073/03:30z - East of Brazil (night data)<br>073/07:10z - Antarctica<br>073/10:35z - South of South Africa<br>073/14:05z - South of Nigeria<br>073/17:35z - Western Atlantic<br>073/21:00z - North of Canada<br><br>March 15, 2022<br>074/00:40z - North Africa (night data)<br>074/06:05z - Antarctica (night data)<br>074/07:55z - North of Alaska<br>074/11:25z - Mozambique<br>074/14:55z - Eastern Atlantic<br>074/18:20z - Canada<br>074/21:55z - Siberia (night data)<br><br>March 16, 2022<br>075/01:40z - Southern Atlantic (night data)<br>075/05:20z - Antarctica<br>075/08:45z - Western Pacific<br>075/12:15z - Central Africa<br>075/15:40z-15:45z - Northern Atlantic<br>075/22:50z - Persian Gulf (night data)<br><br>March 17, 2022<br>076/04:15z - Antarctica (night data)<br>076/06:05z - South of Australia<br>076/09:35z - East of Madagascar<br>076/13:05z - North Africa<br>076/16:30z - Northeast Canada<br>076/20:05z - Siberia (night data)<br>076/23:50z - South of South Africa (night data)<br><br>March 18, 2022<br>077/05:05z - Antarctica<br>077/06:55z - West of Australia<br>077/10:25z - Somalia<br>077/13:50z - Western Europe<br>077/17:20z - Northern Canada<br>077/21:00z - Southern India (night data)<br><br>March 19, 2022<br>078/04:15z - South of Australia<br>078/07:45z - South of India<br>078/11:15z - Egypt<br>078/14:40z - Greenland<br>078/18:15z - Siberia (night data)<br>078/22:00z - South of South Africa (night data)<br><br>March 20, 2022<br>079/01:35z - Southwest of Chile<br>079/05:05z - Australia<br>079/08:35z - Southern India<br>079/12:00z - Southern Europe<br>079/15:30z - North Pole<br>079/19:10z - Southeast Asia (night data)<br>079/23:00z - Antarctica<br><br>March 21, 2022<br>080/02:25z - Southeast of Australia<br>080/05:55z - North of Australia<br>080/09:20z - Iran<br>080/12:50z - Iceland<br>080/16:25z - Eastern Russia (night data)<br>080/20:10z - South of Madagascar (night data)<br>080/23:45z - Southwest of Chile<br><br>March 22, 2022<br>081/03:15z - Eastern Australia<br>081/06:45z - Southeast Asia<br>081/10:10z - Ukraine<br>081/13:40z - North Pole<br>081/17:25z - Indonesia (night data)<br>081/21:05z - Antarctica<br><br>March 23, 2022<br>082/00:35z - South Pacific<br>082/04:05z - North of Australia<br>082/07:30z - Tibet<br>082/11:00z - Norway<br>082/14:35z - North Pacific (night data)<br><br><br><br><b><center>******************** <p style="color:red">Aqua FMU/SSR Anomaly: UPDATE 03.24.22</p> ********************</b></center><br><br>The FOT successfully attempted an FMU/SSR reset on 2022.082 (03/23) resulting in an operational data outage from about 082/15:38z to 082/19:47z per MCST/IOT. Additionally, as part of the fix, the onboard command list which allocates granules to day/night modes was disabled between 082/15:14:51 and 082/15:54:14 and was not restored until 083/01:09:23. As a result, all night mode data was collected as day, which in turn resulted in browse artifacts. The final outage times are incoming and the artifacts will be cleaned up.<br><br><br><br><b><center>******************** <p style="color:red">Aqua FMU/SSR Anomaly: UPDATE 04.05.22</p> ********************</b></center>The artifacts for 2022082 and 2022083 have been cleaned up however it has been decided that re-processing will not be necessary for the previously-affected days. Additionally, final outage times for 2022073 through 2022082 will likely not be provided. This matter is now considered closed.<br><br> |
| AS_MYD_22053 | 2022-02-22 | 2022-02-23 | Note | MODIS Aqua MYD00S Data Gap On February 21st, 2022 (2022.052), a data gap occurred on Aqua MODIS resulting in a data loss for 2022-02-21 22:22:20 through 2022-02-21 22:28:30. This resulted in a small data gap over Alaska. The image below shows this data gap for the daytime orbit. There is unlikely to be any data recovery.<br><br> |
