Detailed Description

Color Key Case pending Case closed Case reopened QA note LDOPE QA Home
Large Image
Case #:PM_MOD11_22318   Opening date: 11/14/22   Last update: 11/15/22
Status: Note
The C6 MODIS Terra Day and Night Land Surface Temperature/Emissivity (MOD11*) daily LST products are showing loss of data retrieval in the L2 and L3 daily/CMG products. The issue is under investigation. The two images below show global browse images from C6 and C61 for October 27th, 2022 (2022.300). The image on the left shows a significant loss of LST retrieval in the C6 MOD11B1 product compared to the global browse image of C61 on the right. LDOPE is currently investigating this to determine the root cause of this issue and the impacted periods. This note will be updated as more information becomes available.

MOD11B1-D1 day A2022300 (2022-10-27)
C6 Global Browse Image

MOD11B1-D1, day A2022300 (2022-10-27)
61 Global Browse Image


UPDATE 11.15.22


The loss of retrieval in C6 MOD11 products has been traced to degraded performance of the input MOD07_L2 Atmospheric Profiles data, because of the Terra PV LWIR bands (27-30) crosstalk effects. Though this crosstalk issue was present from the beginning of the mission, its impact on the product was not significant, and not noticeable until after year-2009. The IR crosstalk effect became more significant following the MODIS Terra safe hold in February 2016. The C6.1 reprocessing implements an approach to correct this crosstalk in the calibration from the beginning of the mission through the safe hold period and into the forward processing period. Hence, users are requested to switch to the C61 version of the Terra LST products for improved performance.

Occurrence: C6 MOD11 L2 and L3 daily/CMG products. Impacted period TBD.

Large Image