MODAPS PCR 25-001
PCR Number | 25-001 |
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Date | 2025-01-10 |
Initiator | Sudipta Sarkar on behalf of Gary Lin (Geolocation) and Jack Ziong, Amit Angal/Kevin Twedt (MCST) |
Abstract | PGE01 7.0.12-2, PGE02 7.0.20-1_0 (Terra), PGE02 7.0.19-1_0 (Aqua), PGE93 7.0.3 This PCR is addendum to the previous PCR24-004 and the updates include: 500m Geolocation Layers:
Geolocation LUT Update:
Removal of Native Resolution Geolocation Layers:
|
Problem Statement | Generate improved version of the MODIS Collection 7 (C7) L1 Geolocation and calibrated Top of Atmosphere (TOA) products, in the first phase of C7 L1 reprocessing, from Terra Beginning of Mission (BOM) in 2000 to end of 2021. |
Description of Change | This PCR is addendum to the previous PCR24-004 and the updates include: 500m Geolocation Layers:
Geolocation LUT Update:
Removal of Native Resolution Geolocation Layers:
|
Products Affected | C7 Geolocation (MxD03), Calibrated TOA (MxD02) and all downstream land and atmosphere products. |
Software Affected | PGE01 7.0.12-2, PGE02 7.0.20-1_0 (Terra), PGE02 7.0.19-1_0 (Aqua), PGE93 7.0.3 |
Processing String to Receive the Change | Terra Reprocessing. Aqua Reprocessing. |
Downstream Product Effects | All C7 MODIS Land + Atmosphere products. |
Data Granules to be Used for Science Testing | Series of science tests were run in AS 1990, 1993, and 1999 to confirm all the changes made to the C7 PGE01 and PGE02, and associated LUTs, and validate their impacts on the L1B products. |
Justification | The geolocation team observed discrepancies in the MODIS Terra C7/L1B data for the latter half of 2000 and earlier portion of 2001 and delivered updated LUT to alleviate the 10 arc sec shifts seen in the data between 2000/305 - 2001/167. The native 250m/500m geolocation layers will not be propagated to downstream L1Bs (MxD02*)/L2s due to storage limations. Hence, the C7/MxD03 products will now have new 500m geolocation (lat/long) layers in addition to the 1km layers. |
Effective Date for Implementation of Change | The PGEs and Recipes mentioned here will be used to initiate the C7 L1 reprocessing, for the 2000 - 2015 period, starting the week of January 13th, 2025. |
Status | Gary Lin approved 01/13/2025, Sadashiva Devadiga 01/13/2025, Miguel Roman approved 01/13/2025, Sudipta Sarkar implemented on 01/10/2025 |