Year
| Case Name | Opening Date | Last Update | Status | Description |
|---|---|---|---|---|
| HC_MOD_25085 | 2025-04-02 | 2025-04-02 | Note | 2025.085 data loss <h1>2025.085 data loss</h1>On March 26th, 2025 (2025/085), a data loss occurred for TERRA MODIS (C61) during the day/night-time orbits over America and eastern Asia/western Australia. The impacted granules are 2025/085/13:30 - 14:00 (inclusive) and 14:25 - 16:00 (inclusive). The cause of the data loss is unknown and EDOS was unable to recover the data. The image below shows the L1B global browse for 2025/085 highlighting the missing data.<br><br><br> |
| HC_MOD_24205 | 2024-07-23 | 2024-07-24 | Note | 2024.205 data loss <h1>2024.205 data loss</h1>On July 23th, 2024 (2024/205), the TERRA MODIS encountered a data loss due to an Antenna Elevation Motor Anomaly at the ground station. EDOS is unable to recover the lost data. The impacted granules are 2024/205/03:25-04:00 (inclusive), 11:50-12:15 (inclusive), 13:25-13:50 (inclusive), 15:05-15:35 (inclusive), 16:45-17:05 (inclusive).<br><br><br> |
| HC_MOD_23219 | 2023-08-18 | 2023-08-18 | Note | 2023.219 data loss On August 7th, 2023 (2023/219), a data loss occurred for TERRA MODIS (C61) during a day-time orbit over the part of South America and Atlantic ocean. The impacted granules are 2023/219/11:24:51 - 219/12:23:36 (inclusive). On DOY 219 at 10:00:00z the FOT was contacted by White Sands scheduling to inform us that their vectors for Aqua, Aura, and Terra would be expiring in 2 hours. After contacting FDS on call and coordination with White Sands Operations the vectors were manually sent and input and White Sands began manually inputting the vectors. Prior to completing the manual entry White Sands identified an issue preventing their system from receiving the vector files. After fixing the issue with their system White Sands requested FDS re-deliver the vectors via the normal path and was able to properly ingest the vectors again. |
| HC_MOD_23226 | 2023-08-14 | 2023-08-21 | Note | LOOps (Light-Out-Operations) Flight Operation Team (FOT) transitioned fully to Light-Out-Operations (LOOps) on July 7th 2023 at 6am EDT following successful testing and Ops Readiness Review. In the LOOps configuration there will not be an on-console engineer working the 12-hour night shift (6pm-6am), but instead system support engineers will be on call during lights out period to respond to red limit alarms as needed. FOT will no longer attempt to fill science data gaps via Solid State Recorder replays so additional data losses and larger data gaps are expected, though estimated data capture is expected to remain above mission data capture guideline of 95%. The examples below show one of the impacted days for TERRA and AQUA. <br><br>A list of TERRA MODIS LOOps Events can be found here: <a href="https://landweb.modaps.eosdis.nasa.gov/displayissue?id=212">TERRA MODIS LOOPs</a <br> <br>A list of AQUA MODIS LOOps Events can be found here: <a href="https://landweb.modaps.eosdis.nasa.gov/displayissue?id=226">AQUA MODIS LOOPs</a><br><br> |
| HC_MOD_23189 | 2023-08-08 | 2023-08-08 | Note | 2023.189 data loss On July 8th, 2023 (2023/189), a data loss occurred for TERRA MODIS (C61) during a day-time orbit over Northern South America and southeast Asia/western Australia. The impacted granules are 2023/189/01:15 â 01:30 (inclusive). The data loss occurred due to bad telemetry data. The image below shows the L1B global browse for 2023/189 where the missing data occurred<br><br><br> |
| HC_MOD_23196 | 2023-08-08 | 2023-08-08 | Note | 2023.196 data loss On July 15th, 2023 (2023/196), a partial and full granule data loss occurred for TERRA MODIS (C61) during a day-time and night-time orbit over North/South America and Eastern Africa. The impacted granules are Day-time: 2023/196/14:15-14:30 (inclusive), 07:55, 08:05, 06:20, Night-time: 01:45-0215 (inclusive), Both-time: 06:30. The data loss occurred due to corrupt level 0 data. The image below shows the Day-time L1B global browse for 2023/196 where the missing data occurred<br><br><br> |
| HC_MOD_23195 | 2023-08-08 | 2023-08-08 | Note | 2023.195 data loss On July 14th, 2023 (2023/195), a partial granule data loss occurred for TERRA MODIS (C61) during a day-time orbit over North America and western South America. The impacted granules are Day-time: 2023/195/16:55-17:10 (inclusive), 15:20, 15:25. The data loss occurred due to corrupt level 0 data. The image below shows the Day-time L1B global browse for 2023/195 where the missing data occurred<br><br><br> |
| HC_MOD_23181 | 2023-07-12 | 2023-07-12 | Note | 2023.181 data loss On June 30th, 2023 (2023/181), a data loss occurred for TERRA MODIS (C61) during a night-time orbit over Northern South America and southeast Asia/western Australia. The impacted granules are 2023/181/01:45 and 2023/181/14:31:40 - 15:21:13 (inclusive). ATC dumped data on a deleted contact and the continuity report didn't show data loss until after the end of the next contact (16:00:00 - 16:18:00). LRS data is fully recovered and some ASTER. However MODIS and MISR are unrecoverable. The image below shows the L1B global browse for 2023/181 where the missing data occurred<br><br><br> |
| HC_MOD_23007 | 2023-06-15 | 2023-06-15 | Note | Terra Data Loss 2023.007 (01.07.23) On January 7th, 2023 (2023/007), a data loss occurred for TERRA MODIS (C61) during a nighttime orbit over Eastern Australia and Eastern Asia. The impacted granules are from 2023/007/09:06:40 - 007/12:40:11 inclusive. During the TDRSS contact with TDS, no S-band telemetry was being received. White Sands reported they were experiencing equipment problems and there was no chance of recovery for the contact. Despite series of data recovery attempts, the data recoveries were unsuccessful. On the scheduled contact with TDW (007/13:42:00 - 14:00:00z), the MISR buffer was disabled at AOS and was re-enabled through the PBFLEX procedure. Automation was re-enabled at 13:58:09z. A DB request was sent out for the MODIS data, and a partial recovery of the data was made. The image below shows the L1B global browse for 2023/007 where the missing data occurs. |
| HC_MOD_23061 | 2023-06-15 | 2023-06-15 | Note | Terra Data Loss 2023.061 (03.02.23) On March 2nd, 2023 (2023/061), a data loss occurred for TERRA MODIS (C61) during a nighttime orbit over Northern Central Pacific Ocean. The impacted granules are from 2023/061/08:23:41 - 061/08:36:19 inclusive. During the TDRSS contact with TDE (061/09:15:59 - 09:26:59z), the OCE ran a PBFLEX for 6 minutes. No K-Band RF was being received from White Sands. The OCE ran a PBSTOP and called White Sands to troubleshoot the issue. White Sand conducted a chain failover, but the K-Band lock was still not established. The OCE ran replays of MODIS and MISR, followed by another PBFLEX of 6 minutes. Data gaps appeared in the continuity report for MODIS. The DB community was notified to see if the MODIS data could be recovered, but their attempts were unsuccessful. The image below shows the L1B global browse for 2023/061 where the missing data occurs. |
| TM_MOD28_23160 | 2023-06-15 | 2023-06-15 | Note | MxD28C3 Storage Values Discrepency On 6/9/2023, the science team found the storage capacity values in the lake information parameter file of the MODIS Global Water Reservoir 8-day product (MxD28C2) are inconsistent with the one used for the monthly product (MxD28C3) over the following locations:<br><br> Lake ID 23 (Okeechobee)<br> Lake ID 59 (Kovdozero)<br> Lake ID 73 (Storsjon)<br>Lake ID 119 (Kallsjon)<br> Lake ID 122 (Tshangalele)<br>Lake ID 161 (Lake Ross)<br><br>This discrepancy arises from the utilization of different sources for the reservoir capacity values, and only affects the 8-day storage values at these six locations (with a constant offset at each location). To ensure consistency, the lake information parameter file for PGE188 MxD28C2 has been updated. A reprocessing of the PGE188 MxD28C2 for the mission period will be conducted. <br><br> |
| HC_MOD_23062 | 2023-06-15 | 2023-06-15 | Note | Terra Data Loss 2023.062 (03.03.23) On March 3rd, 2023 (2023/062), a data loss occurred for TERRA MODIS (C61) during a daytime orbit over Central Asia. The impacted granules are from 2023/062/02:31:40 - 062/03:34:02 inclusive. During the TDRSS contact with TDE (062/03:36:00 - 03:52:43z), a high CADU delta occurred after the automated playback. The OCE ran a LAST_MODIS replay followed by an ALL_MODIS replay in an attempt to recover the MODIS data. Data gaps appeared in the continuity report for MODIS. The DB community was notified to see if the MODIS data could be recovered, and they were able to make a partial recovery. The image below shows the L1B global browse for 2023/062 where the missing data occurs. |
| HC_MOD_24171 | 2024-06-19 | 2024-06-24 | Note | 2024.171-172 data loss On June 19th, 2024 (2024/171), the TERRA MODIS encountered a data loss due to a power outage at White Sands. EDOS only received the partial data from 171/22:00-172/04:00 (inclusive) and unable to recover the lost data. The impacted granules are 2024/171/23:00 - 172/00:15 (inclusive), 2024/172 01:15 - 03:25 (inclusive).<br><br><br> |
| TM_MOD_22353 | 2023-03-23 | 2023-03-23 | Note | Terra Data Loss 2022.353 (12.19.22) On December 19th, 2022 (2022/353), a data loss occurred for TERRA MODIS (C61) during a daytime orbit over Europe and Western Africa. The impacted granules are from 2022/ 353/09:35:39 to 353/10:10:34 inclusive. Automation was disabled on the previous MODIS contact due to contact length and playback duration. After a further investigation, it was discovered that the upconverter failed to turn on, and only the lock-up region for MODIS was captured during the contact. A DB request was sent out to see if the MODIS data could be recovered, and one of the DB sites was able to make a partial MODIS recovery. The remaining data is not recoverable. The image below shows the L1B global browse for 2022/353 where the missing data occurs. |
| TM_MOD_22336 | 2023-03-23 | 2023-03-23 | Note | Terra Data Loss 2022.336 (12.02.22) On December 2nd, 2022 (2023/336), a data loss occurred for TERRA MODIS (C61) during a daytime orbit over the Eastern Hemisphere. The impacted granules are from 336/02:38:04 to 336/ 03:30:12 inclusive. Automation was disabled on the previous MODIS contact due to contact length and playback duration. After a further investigation, it was discovered that the upconverter failed to turn on, and only the lock-up region for MODIS was captured during the contact. A DB request was sent out to see if the MODIS data could be recovered, and one of the DB sites was able to make a partial MODIS recovery. The remaining data is not recoverable. The image below shows the L1B global browse for 2022/336 where the missing data occurs. |
| TM_MOD_23036 | 2023-02-16 | 2023-02-21 | Note | Data loss 2023.036 (02.05.23) On February 5th, 2023 (2023/036), a data loss occurred for Terra MODIS (C6 and C61) during a daytime orbit over western South America. The impacted granules are 14:20 - 15:05 inclusive. The geolocation team confirmed the missing ephemeris and attitude data between 14:18 - 15:11z. The attitude file from the spacecraft had a bad datapoint which can invalidate the entire span. The EOS FDS delivered a corrected version of the definitive attitude file for that span to DAAC on Monday (02/13/2023), but the reprocessed ancillary attitude and ephemeris data failed to resolve the issue and the data is non-recoverable. The image below shows the global browse of surface reflectance for 2023/036. <br><br> |
| PM_MOD_22353 | 2023-01-27 | 2023-01-27 | Note | Data loss 2022.353 (12.19.22) On December 19th, 2022 (2022.353) a data loss occurred for Terra MODIS, the data loss impacts time 2022.353/09:35:39z - 10:10:44z, which occurred during a daytime orbit over portions of Europe and Africa. The cause of the data loss is unknown and attempts to recover the data were unsuccessful. Due to this event L1B granules 09:35 through 10:10 (inclusive) will not be produced. The image below shows the surface reflectance global browse image for 2022.353, where the data loss is observed over portions of Europe and Africa. Processing has been closed and this data is not recoverable.<br><br> |
| PM_MOD_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_MOD_22335 | 2022-12-08 | 2022-12-16 | Closed | Unavailability of MODIS Terra data 2022.335 (12.01.22) MODIS Terra production has been put on hold starting on day 2022.335, 03:15 UTC onwards. The production has been failing in the L1 geolocation process and may be due to the orbital drift of Terra, following the CEMs. The geolocation team is investigating the issue and further updates will be posted as and when ready. The image below shows the global browse image for the Terra Surface reflectance (MOD09) on December 1st, 2022 (2022.335), where the data production failures have impacted this day in the forward processing.<br><br><br> |
| PM_MOD_22270 | 2022-09-28 | 2022-09-29 | Note | Data loss due to contact error 2022.270 On September 27th, 2022 (2022.270) a data gap occurred on Terra MODIS due to a contact error from 03:40:57 - 03:46:33. Processing has been closed and the data is not recoverable. The gap in granules 03:40 and 03:45 occurred during a nighttime orbit over the western coast of South America. The first image below shows the impacted period in the MODIS Terra thermal band 29 during a night time orbit, with the data gap highlighted by the black box. |
| PM_MOD_22074 | 2022-03-15 | 2022-03-15 | Pending | MODIS TERRA Anomaly 2022.074 (03/15/22) Terra MODIS encountered a SEU Command Processor and Format Processor reset today 03.15.22 (2022.074) at around 08:54z. As a result, MODIS entered standby mode. Though the data acquisition is going on, with some interruptions between 08:45z - 09:40z, the science quality will be degraded as the onboard calibrators (blackbody) is turned off and the onboard tables were reverted back to their at-launch values.<br><br>As a CP reset was encountered, subsequent patches need to be uploaded to the S/C after MODIS is recovered from the Standby mode. As a result of this, the recovery plan was divided into two parts, whereby in the first part, MODIS is to be transitioned from the standby to science mode and critical patches uploaded. The second part involves uploading more patches and gain tables to return the same configuration as before the anomaly. MCST and FOT are working to perform the recovery process. Recovery is expected to be in two phases:<br>- Bring the instrument back to science mode [074/22:21:28z]<br>- Upload revised tables to return to the pre-anomaly configuration [074/22:23:38z].<br><br>MODIS continues to operate normally with the FPA and instrument temperatures showing nominal values. While MCST continues to perform a detailed evaluation of the radiometric performance of the instrument since the anomaly, the data since the anomaly is expected to be of a degraded science quality. In particular, band 5 gains (reset to at-launch value due to this anomaly) is expected to show about 20-30% difference relative to pre-anomaly levels. We expect these to return to pre-anomaly levels once the entire recovery process is complete. We will keep you posted on the instrument recovery status and data anomaly. Further details may be available in <a href="https://landweb.modaps.eosdis.nasa.gov/displayissue?id=246">the NRT note</a>.<br><br><br><br><b><center>******************** <p style="color:red">SEU Reset: UPDATE 03.15.22</p> ********************</b></center><br><br>The first part of the recovery process was completed this evening (03.15.2022) and MODIS successfully transitioned to science mode. The second part of the recovery process is to be reviewed with ART on 03.16 and subsequent recovery is planned thereafter.<br><br><br><br><b><center>******************** <p style="color:red">SEU Reset: UPDATE 03.17.22</p> ********************</b></center><br><br>The MODIS IOT performed the second part of the commanding to upload additional patches and gain tables to successfully return the MODIS instrument to the same configuration as before the anomaly. All the commanding was successfully performed. Band 5 gains have returned to pre-anomaly levels, however, we expect degraded science data quality through about 076/02:20, when the SCI_ABNORM_FLAG was set back. A more detailed timeline of the outages is being compiled. Over the next few days, radiometric performance will continue to be evaluated and any updates will be reported.<br><br><br><br><b><center>******************** <p style="color:red">SEU Reset: UPDATE 03.29.22</p> ********************</b></center><br><br>MODAPS will re-process all affected Terra L1B, L2, and L3 dailies and 8-day products for C6 (2022074 - 2022076) and C61 (2022074 - 2022084). This has become necessary in light of the post-event assessment performed by the MODIS Calibration Team (MCST) which suggested the following after-effects:<br>1) Minor gain changes that were noticed in the RSB bands, with band 5 showing significant gain change.<br>2) Amongst the TEB bands, band 21 is showing slightly higher noise levels.<br>3) Changes noticed in mirror side differences.<br><br>For more details, users may refer to the <a href="https://landweb.modaps.eosdis.nasa.gov/data/userguide/Terra_CP_FP_Reset_MCST_PostAssessment.pdf">MCST findings.</a><br><br><br><br><b><center>******************** <p style="color:red">SEU Reset: UPDATE 04.15.22</p> ********************</b></center><br><br>All affected Terra products, both dailies and n-days, have been re-processed for both C6 and C61. This issue is now considered resolved.<br><br> |
| AS_MOD28_21356 | 2021-12-22 | 2021-12-22 | Pending | MxD28C3 C61 evaporation rate bug The existing C61 MxD28C3 MODIS Water Reservoir products have a small bug, which causes some errors with the evaporation rate at a few reservoirs for a short period (see figure below for Lake ID: 094 as an example). This was found to have been caused by some zero area values that led to abnormal temperature profiles. This will be addressed soon and all existing MxD28C3 products will be reprocessed. This has no impact on the MxD28C2 products and users can continue to use those in the interim. This note will be updated once the affected MxD28C3 have been reprocessed. Users are advised not to use those in the meantime from LP-DAAC.<br><br> |
| PM_MOD_21264 | 2021-09-21 | 2022-12-05 | Note | Terra Constellation Exit Users of MODIS Science data products are requested to note that MODIS Terra is scheduled to exit the Morning Constellation of Earth Science satellites by October, 2022. Because of onboard fuel shortage, the last of Terra mission maneuver was done on February 27, 2020 to maintain the mean local time (MLT) of 10:30 AM. Thereafter, Terra has been drifting slowly from its MLT and will reach and exceed 10:15 AM MLT by October 2022, when it will make the constellation exit with a lowered orbit altitude of 694kms. More information in this regard can be found <A href="https://modis.gsfc.nasa.gov/news/individual.php?news_id=100378"> here</A> and<A href="https://terra.nasa.gov/about/terra-orbital-drift#:~:text=The%20Constellation%20Exit%20lowers%20the,to%20an%20uncontrolled%20de%2Dorbit."> here.</A><br><br>Please note that this does not indicate the end of life for Terra mission and Terra is expected to remain operational for at least another 5 more years and NASA SIPS will continue to produce and distribute science quality data through Fall of 2025. 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><br><br><br><b><center>************************************************ <p style="color:red">Terra Constellation Exit: UPDATE 12.05.22</p> ************************************************</b></center><br><br>C61/Terra post-CEM reprocessing: The recent Terra lunar calibration results indicated significant changes of cross-talk effects to some detectors in PV LWIR bands (bands 27-30) after the Constellation Exit Maneuver (CEM). MCST recommends to reprocess the Terra C6.1 L1B data (2022/296, 2200 onwards) after the CEMs using the updated LUT delivery, V6.2.2.81. The same L1B LUTs that resolves this drift in the PV-LWIR cross-talk has been operational in the C61 forward processing stream, starting 2022-11-22 (DOY 2022/326). Based on MCST's recommendation, following the CEMs, Terra L1Bs, LST (MOD21*) and L2 atmospheric products will be reprocessed for the period 2022-10-23 (DOY 2022/296) thru 2022-11-21 (DOY 2022/325 included).<br><br><br><br><br><b><center>************************************************ <p style="color:red">Terra Constellation Exit: UPDATE 11.04.22</p> ************************************************</b></center><br><br>The Terra MODIS instrument is operating in nominal status and all Terra MODIS operational production for C6 and C61 has resumed starting on 10.23.22 (2022.296) at 22:35 UTC.<br><br><br><br><br><b><center>************************************************ <p style="color:red">Terra Constellation Exit: UPDATE 10.28.22</p> ************************************************</b></center><br><br>All Terra NRT data production from NASA LANCE has resumed as of October 28 at 00:00, following a prolonged outage because of two successive Constellation Exit Maneuvers (CEM) that were performed on October 12 and 19 respectively.Following the CEMs, the space and nadir view doors were opened on October 21, and the MODIS formatter resumed nominal day/night mode operations from October 22. All instrument temperatures had attained their nominal values by October 23. Assessments carried out by the MODIS validation team now indicates nominal performance and no major cause for concerns, barring slight gain changes that have been noticed for some of the SWIR bands (mainly for Band 5), and possibly slight change in cross-talk behaviors for some of the PV-LWIR detectors.<br><br>Users are being warned, not to use any Terra MODIS data products that may be available from nrt3 or nrt4 servers, prior to October 28 (DOY 301) resumption of Terra data from LANCE NRT, as all instrument status and performance may not have been nominal till then.<br><br>MODAPS is also expected to resume the operational forward processing of all MODIS Terra products, shortly.<br><br><br><br><br><br><b><center>************************************************ <p style="color:red">Terra Constellation Exit: UPDATE 10.25.22</p> ************************************************</b></center><br><br>Over the past few days, the MODIS IOT commanded the MODIS instrument back into nominal science mode after a 24-hour outgas period. The return to nominal command was issued at 2022/294 19:59:10z. The nadir and SV doors have been opened and the CFPAs and BB are in the process of returning to their nominal temperatures. These temperatures will take a few days to settle, after which time MCST will begin to evaluate the performance of each band. The Day/Night formatter has returned to normal starting on day 295, with the first granule with daytime data starting at 2022295.0040.<br><br><br><br><br><b><center>************************************************ <p style="color:red">Terra Constellation Exit: UPDATE 10.20.22</p> ************************************************</b></center><br><br>Terra Constellation Exit Maneuver (CEM) #2 was completed successfully on October 19. The loss of pointing accuracy times are: LOPA: 2022/292 19:03:45-22:48:44. Starting today, October 20, MODIS IOT will begin commanding to return the sensor back to nominal operations. Following that, MCST will begin to assess the instrument status next week. MODAPS will resume all Terra data production, once confirmation and updated LUTs are received from MCST.<br><br><br><br><br><b><center>************************************************ <p style="color:red">Terra Constellation Exit: UPDATE 10.12.22</p> ************************************************</b></center><br><br>The first of the Terra Constellation Exit Maneuver (CEM) was completed successfully on October 12, between 14:20:54 - 15:05:10. All Terra MODIS data production and distribution are to remain on-hold from both STD and NRT streams, following the last Terra Constellation Exit Maneuver (CEM) on October 19, for at least a week, till around October 26 or slightly more. During this time, the MODIS calibration team (MCST) will review all instrument performance and will most likely provide updated LUTs to address any drifts or issues. Following the confirmation of all Terra MODIS instrument status and the delivery of updated LUTs, MODAPS will resume all Terra MODIS data production from both, STD and NRT streams and may also reprocess some of the days following the end of the last CEM on October 19, with the updated LUTs.<br><br><br><br><br><b><center>************************************************ <p style="color:red">Terra Constellation Exit: UPDATE 09.26.22</p> ************************************************</b></center><br><br>The initial Terra Constellation Exit Maneuver (CEM) is scheduled for October 12, 2022, around 7:30 am EDT. The CEM will be carried out through two successive maneuvers, on October 12 and 19, respectively. Users should expect Terra MODIS data outage, starting October 10 till October 19. Following the last maneuver on October 19, an outgas procedure will be performed and all things are expected to stabilize within 48 hours after that. MCST will monitor the telemetry and an update will be provided when all instruments approach their nominal operating temperatures. Users should exercise caution, while using the Terra MODIS data between October 19 - October 21, as all instruments are still recovering, after the outage. Special LUT deliveries are expected to account for any gain changes that may occur in the instrument upon recovery.<br><br><br><br><br><b><center>************************************************ <p style="color:red">Terra Constellation Exit: UPDATE 09.20.22</p> ************************************************</b></center><br><br>The initial Terra Constellation Exit Maneuver (CEM) is scheduled for October 12, 2022, around 7:30 am EDT. The CEM will be carried out through two successive maneuvers, on October 12 and 19, respectively. All science data acquisition will remain suspended during, between, and following these two successive maneuvers, for a period of about 10 days, as MODIS will remain in a "CEM configuration" mode between the CEMs, where SV and EV doors will remain closed, Blackbody will be turned off and the SMIR and LWIR focal plane/heaters will be turned off as well. Post CEM, some more time will be needed to bring all instruments back to their nominal status. Post-CEM calibrations will be performed over the following weeks and LUT updates will occur as needed. MODIS data users of both NRT and operational processing streams are requested to take note of this and expect data outage for at least 10 days, starting October 12. This note will be further updated after the event, once all instruments are back to their nominal status and both NRT / operational production has resumed.<br><br><br><br> |
| TM_MOD_24152 | 2024-05-31 | 2024-05-31 | Note | TERRA GPS Shift Anomaly <h1>TERRA GPS Shift Anomaly </h1>On 2024/132 at 23:00:15z, Terra exceeded its constraints for its on-board navigation system calculations and transitioned from real time orbit determination using TONS to a propagation based state calculation off of the last valid TONS update. The behavior was likely due to the strong solar storm from that weekend, rather than any corrective actions that were undertaken for the shunt anomaly. At 2024/133 at 16:29:55z, the position and velocity covariances returned within tolerance for Terra to transition back to real time calculations of its state (see Figure 1 and Figure 2). No specific corrective actions were required on the part of the Terra flight team, and is likely due to high drag environment induced by the recent solar activity throwing off the models for the TDRS/EOS states onboard the spacecraft. |
| PM_MOD_20314 | 2020-11-09 | 2021-01-29 | Note | MODIS C61 readiness MODAPS has completed processing 7 years of data from the initial mission period (2000 - 2006) in the on-going C61 reprocessing, and has also completed the processing of years 2019-2020. The C61 forward processing is expected to start by first week of February from beginning of 2021. Reprocessing will switch back to process the period 2007 - 2018 once the C61 forward processing has caught up to the leading edge of the ongoing C6 forward processing.<br><br>All MODIS land products from the on-going C61 reprocessing is expected to be released to public from the different DAACs starting February 2021. At the current processing rate MODAPS hopes to complete the C61 reprocessing of the remaining mission period by summer of 2021.<br><br>All C6 land products will continue to be processed in parallel with C61, through the end of 2021, subsequent to which the C6 will be discontinued. Users should note the essential similarity of most land data products, between C6 and C61, barring the calibration updates in C61 (refer to the specific C61 land changes<A href="https://landweb.modaps.eosdis.nasa.gov/data/userguide/C61MODISLandStatus.pdf"> here</A>) and are requested to switch to C61 at their earliest convenience.<br><br> |
| PM_MOD11_20300 | 2020-11-05 | 2020-11-05 | Pending | C61 Cloud Gap-Filled (CGF) products, MOD11/MYD11 2019 Users are requested to maintain caution, while using the C61 LST, from combined day/night algorithms, in the MODIS heritage LST products, M*D11B1/B2/B3 for the first month of year 2019 (January 1st - January 31st). The said products for this first month of 2019 are expected to be sub-par as the first month was used as a spin-up period, needed to build up a stable atmosphere profile that is needed by the day/night algorithm. The main split-window algorithm should however be nominal and ready for use, during this period. The MxD11 LST for January of 2019 will be re-processed later, once the trailing edge of C61 re-processing catches up to 2019. We will update this note as and when this happens and January of 2019 is re-processed.<br><br> |
| PM_MOD10_20300 | 2020-10-26 | 2020-10-26 | Pending | C61 Cloud Gap-Filled (CGF) products, MOD10A1F/MYD10A1F 2019 Users are requested to maintain caution, while using the C61 Cloud Gap-Filled (CGF) products, MOD10A1F/MYD10A1F for the first month of year 2019 (January 1st - January 31st). The said products for this first month of 2019 are expected to be a little unstable, as the very first day, 2019-001 was forced to run without using the CGF from the prior day (2018365) as expected. Any instability in these products are expected to diminish gradually, over the month of January and users can use these products, starting from the end of this month and onwards. January of 2019 will be re-processed later, with the expected CGF from 2018-365, once the trailing edge of C61 re-processing catches up to 2019. We will update this note as and when this happens and January of 2019 is re-processed.<br><br>The images below show MOD10A1F/MYD10A1F from 2019-001 side by side with the MOD10A1/MYD10A1 products, which shows that for this first day, the two products are identical.<br><br> |
| PM_MOD_19305 | 2019-11-05 | 2023-11-03 | 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_MOD_19301 | 2019-10-28 | 2019-10-29 | Pending | Data loss Due to Production Errors C61 Production issues have been observed in the Terra MODIS C61 processing. This note will document specific instances with examples and provide updates as these issues are investigated and resolved.<br><br><br>1) DOY 2000.065, MOD09GA L2G data gaps for a number of tiles starting in the MOD09GA and impacting all downstream products. No issues are observed in the upstream L1B Data for these periods. The image below shows the Terra MODIS L2G MOD09GA product for 2000.065, where tiles h24v06 and h27v07 are missing.<br><br> |
| HC_MOD_24106 | 2024-04-19 | 2024-04-19 | Note | 2024.106 ancillary data loss On April 15th, 2024 (2024/106), the TERRA MODIS encountered a data gap due to missing ancillary data during the day-time orbit over Asia and the night-time orbit over North/South America. The impacted granules are 2024/106/02:00 - 106/04:00 (inclusive) and the data is unrecoverable.<br><br><br> |
| HC_MOD_24031 | 2024-01-31 | 2025-04-29 | Note | MODIS Missing Ephemeris and Attitude inputs <h1>TERRA Missing Ephemeris and Attitude inputs (BoundingCoord Error)</h1>The rolling note here is to document the known occurrences of Terra MODIS missing ephemeris and attitude inputs. As a result, the L1Bs will show gaps for the affected granules (click on the Global Browse link below) and the data is not recoverable. The data loss will be observed in the L1Bs and all downstream products.<br><br> <table class="style14" border="2"> <tbody> <tr> <th>Date (DOY)</th> <th>Date (mmddyear)</th> <th>Version</th> <th>Granule Loss</th> <th>Global Browse</th> <th>Notes</th> </tr> <tr> <td>2025/072 </td> <td>03/13/2025 </td> <td>C061 </td> <td>00:45-01:05 (inclusive) </td> <td style="text-align: center;"><a href="https://landweb.modaps.eosdis.nasa.gov/details?id=192&date=2025072">2025/072</a></td> <td style="text-align: center;">NorthBoundingCoord is less than SouthBoundingCoord</td> </tr><tr> <td>2025/065 </td> <td>03/06/2025 </td> <td>C061 </td> <td>04:10-04:15 (inclusive) </td> <td style="text-align: center;"><a href="https://landweb.modaps.eosdis.nasa.gov/details?id=192&date=2025065">2025/065</a></td> <td style="text-align: center;">NorthBoundingCoord is less than SouthBoundingCoord</td> </tr><tr> <td>2025/059 </td> <td>02/28/2025 </td> <td>C061 </td> <td>00:15-00:20 (inclusive) </td> <td style="text-align: center;"><a href="https://landweb.modaps.eosdis.nasa.gov/details?id=192&date=2025059">2025/059</a></td> <td style="text-align: center;">NorthBoundingCoord is less than SouthBoundingCoord</td> </tr><tr> <td>2025/049 </td> <td>02/18/2025 </td> <td>C061 </td> <td>22:25-23:15 (inclusive) </td> <td style="text-align: center;"><a href="https://landweb.modaps.eosdis.nasa.gov/details?id=192&date=2025049">2025/049</a></td> <td style="text-align: center;">NorthBoundingCoord is less than SouthBoundingCoord</td> </tr><tr> <td>2025/024 </td> <td>01/24/2025 </td> <td>C061 </td> <td>00:10-00:30 (inclusive) </td> <td style="text-align: center;"><a href="https://landweb.modaps.eosdis.nasa.gov/details?id=192&date=2025024">2025/024</a></td> <td style="text-align: center;">NorthBoundingCoord is less than SouthBoundingCoord</td> </tr> <tr> <td>2025/009 </td> <td>01/09/2025 </td> <td>C061 </td> <td>00:10-00:25 (inclusive) </td> <td style="text-align: center;"><a href="https://landweb.modaps.eosdis.nasa.gov/details?id=192&date=2025009">2025/009</a></td> <td style="text-align: center;">NorthBoundingCoord is less than SouthBoundingCoord</td> </tr> <tr> <td>2024/009 </td> <td>01/09/2024 </td> <td>C061 </td> <td>00:00, 00:05 </td> <td style="text-align: center;"><a href="https://landweb.modaps.eosdis.nasa.gov/details?id=192&date=2024009">2024/009</a></td> <td style="text-align: center;">NorthBoundingCoord is less than SouthBoundingCoord</td> </tr> <tr> <td>2024/008</td> <td>01/08/2024</td> <td>C061</td> <td>23:30-23:55 (inclusive)</td> <td style="text-align: center;"><a href="https://landweb.modaps.eosdis.nasa.gov/details?id=192&date=2024008">2024/008</a></td> <td style="text-align: center;">NorthBoundingCoord is less than SouthBoundingCoord</td> </tr> <tr> <td>2023/355</td> <td>12/21/2023</td> <td>C061</td> <td>01:40-02:20, 03:30-03:55 (inclusive)</td> <td style="text-align: center;"><a href="https://landweb.modaps.eosdis.nasa.gov/details?id=192&date=2023355">2023/355</a></td> <td style="text-align: center;">NorthBoundingCoord is less than SouthBoundingCoord</td> </tr> </tbody> </table> <br><br> |
| TM_MOD44_24008 | 2024-01-08 | 2024-01-09 | Note | C61/MOD44W - Legend correction The "seven_class" SDS layer legend is misrepresented in the C61/Land Water Mask product (MOD44W) for the entire mission period. The SDS legend "4" and "5" is incorrectly listed as "Deep Inland Water" and "Ephemeral Water" respectively. Users are requested to follow the legend description listed below and read more details listed in the <a href = "https://landweb.modaps.eosdis.nasa.gov/data/userguide/MOD44W_User_Guide_C61.pdf"><b>User Guide</b></a>. The science team will address the mismatched legend description during the collection 7 reprocessing. <br><br><center><table border=2 class="style14" target="_blank" style="display: inline-block"rel="noopener noreferrer"><caption>Correct Legend <br>(User Guide)</caption><tr><th>Value</th><th>Class</th></tr><tr><td>0</td><td>Shallow Ocean</td></tr><tr><td>1</td><td>Land</td></tr><tr><td>2</td><td>Shoreline</td></tr><tr><td>3</td><td>Inland Water</td></tr><tr style="background-color:rgba(255,0,0,0.3)"><td>4</td><td>Ephemeral Water</td></tr><tr style="background-color:rgba(255,0,0,0.3)"><td>5</td><td>Deep Inland Water</td></tr><tr><td>6</td><td>Moderate Ocean</td></tr><tr><td>7</td><td>Deep Ocean</td></tr><tr><td>250</td><td>Outside of Projection</td></tr></table>    <table border=2 class="style14" target="_blank" style="display: inline-block"rel="noopener noreferrer"><caption>Incorrect Legend<br>(seven_class SDS)</caption><th>Value</th><th>Class</th><tr><td>0</td><td>Shallow Ocean</td></tr><tr><td>1</td><td>Land</td></tr><tr><td>2</td><td>Shoreline</td></tr><tr><td>3</td><td>Inland Water</td></tr><tr style="background-color:rgba(255,0,0,0.3)"><td>4</td><td>Deep Inland Water</td></tr><tr style="background-color:rgba(255,0,0,0.3)"><td>5</td><td>Ephemeral Water </td></tr><tr><td>6</td><td>Moderate Ocean</td></tr><tr><td>7</td><td>Deep Ocean</td></tr><tr><td>250</td><td>Outside of Projection</td></tr></table></center> |
| HC_MOD_23246 | 2023-09-12 | 2023-09-12 | Note | 2023.246 data loss On September 3rd, 2023 (2023/246), data loss occurred for TERRA MODIS (C61) during a day-time orbit over the part of eastern Australia/Pacific ocean and the night-time orbits over southern North America and India. The impacted granules are 2023/246/23:47 - 247/01:10 (inclusive), 246/03:30, and 246/16:40. A contact that was scheduled for 247/01:05 was deleted due to a request by the ground station. The lost data is not recoverable.<br><br><br> |
| TM_MOD_23233 | 2023-08-21 | 2025-04-23 | Note | LOOps (Light-Out-Operations) Data Loss Record <h1>TERRA LOOps (Light-Out-Operations)</h1>This rolling note documents known occurrences of LOOps data loss events affecting TERRA MODIS. More information about these data loss events can be found here: <a href="https://landweb.modaps.eosdis.nasa.gov/displayissue?id=196">LOOps (Light-Out-Operations)</a><br><br> |
| HC_MOD_23156 | 2023-08-18 | 2023-08-18 | Note | 2023.156 data loss On June 5th, 2023 (2023/156), a intermittent data loss occurred for TERRA MODIS (C61) during a day-time orbit over the Southern and Middle Pacific ocean. The impacted granules are 2023/156/18:29:09 - 156/21:16:55 (inclusive). Due to several launch slips, there were multiple deleted contacts resulting in a blind acquisition with AS1 (AOS: 19:38:00, LOS 19:49:00). A partial playback was executed, playing back 8000 EDU blocks of MODIS and 4000 EDU Blocks of MISR. During the contact with AS1, there were continuous data hits during the playback of MODIS and MISR. The attempt to recover the MISR lock-up region was unsuccessful. |
