MODAPS PCR VNP 22-005
PCR Number | VNP 22-005 |
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Date | 2022-08-26 |
Initiator | Sudipta Sarkar, Carol Davidson |
Abstract | All VIIRS products-- For all science changes, refer to section 8 above. |
Problem Statement | Generate improved version of the C2 SNPP and JPSS1 (J1) VIIRS land products through Collection 2 reprocessing, using the C2 version of L1B/Geolocation products as input (C2.1 for J1), along with land product specific changes recommended by the VIIRS land science teams. This particular PCR is for Tier1 set of products that are scheduled to go in first for reprocessing. |
Description of Change | Key C2 specific land product science changes and updates, other than routine bug fixes, are summaried below:
|
Products Affected | VIIRS land products |
Software Affected | VIIRS land products |
Processing String to Receive the Change | S-NPP Forward Processing. S-NPP Reprocessing. J1 Forward Processing. J1 Reprocessing. |
Downstream Product Effects | All VIIRS land products |
Data Granules to be Used for Science Testing | Series of product-specific science tests and land chain-tests have been run generating global data from winter and summer period and have been reviewed by LDOPE and the respective science teams. |
Justification | Transitioning to C2 variations will help address several critical issues like: 1. Benefit from all the improvments made in the C2 NASA L1B/Geolocation products. 2. Making J1 land data products available to the users for the first time since the launch of mission. 3. Ensuring NASA EOS land data continuity through MODIS Aqua comparable SNPP and J1 land products. 4. Use of a consistent and improved MODIS compliant 8-class LWM across all land data products, except VI. 5. Uses improved cloud mask from use of daily VIIRS snow and high resolution climatology VI replacing the 25km NISE data and 5km Climatology VI used in C1 reprocessing that resulted in blocky artifact with noticeable performance degradation in downstream products. 6. Make a number of product specific improvements and bug fixes across the board for different land products |
Effective Date for Implementation of Change | PGEs noted in attached document are expected to go for C2 reprocessing for both SNPP and J1, from 2018001, by 08/31/2022 on Ops7. A second stream of reprocessing, with the same set of PGEs and from the beginning of the SNPP mission will follow this on Ops4, by September, 2022. |
Status | Major algorithm development completed. Sadashiva Devadiga approved 09/14/2022. Sudipta Sarkar approved 09/14/2022. |