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MODAPS PCR VNP 23-002

PCR Number	VNP 23-002
Date	2023-02-16
Initiator	Sudipta Sarkar, Carol Davidson, Huilin Gao
Abstract	PGE687 2.0.1, PGE688 2.0.1, PGE698 2.0.1 Initial version of the Global Reservoir suite of PGEs, PGE687, PGE688, and PGE698, developed at SCF in Texas A&M University, followed by suitable loader module (LM) and production rule updates and additions by LandSIPS STIG to complete the transition to a LandSIPS PGE. Specific Algorithm Change/Improvements, following the initial delivery: Integration of all necessary LM and Production rules. Several bug fixes by STIG and SCF to avoid certain memory errors on specific production hosts and to prevent failures when trying to open a read-only file.
Problem Statement	Introduction of the JPSS1 and SNPP VIIRS version of the Global Water Reservoir products, as part of the VIIRS Collection 2 (C2) and onwards. Specifically, this suite will include the SNPP versions of CMG VNP28C2/C3 products and the JPSS1 versions the CMG VJ128C2/C3 products.
Description of Change	Initial version of the Global Reservoir suite of PGEs, PGE687, PGE688, and PGE698, developed at SCF in Texas A&M University, followed by suitable loader module (LM) and production rule updates and additions by LandSIPS STIG to complete the transition to a LandSIPS PGE. Specific Algorithm Change/Improvements, following the initial delivery: Integration of all necessary LM and Production rules. Several bug fixes by STIG and SCF to avoid certain memory errors on specific production hosts and to prevent failures when trying to open a read-only file.
Products Affected	VNP28C2, VNP28C3, VJ128C2, and VJ128C3
Software Affected	PGE687 2.0.1, PGE688 2.0.1, PGE698 2.0.1
Processing String to Receive the Change	S-NPP Forward Processing. S-NPP Reprocessing. J1 Forward Processing. J1 Reprocessing.
Downstream Product Effects	SNPP VIIRS Land products, including VNP28C2/C3 and VJ128C2/C3
Data Granules to be Used for Science Testing	Several science tests have been carried out, including one final one in AS 4007, to assess the performance of these products. All results have been duly reviewed and confirmed by the science team and LDOPE, before final approval.
Justification	The introduction of the SNPP and JPSS1 VIIRS Global Reservoir products will ensure the continuity with the MODIS heritage products and will provide critical datasets that are requested by the user and the modeling community.
Effective Date for Implementation of Change	PGEs noted in this document are expected to go into production, as part of the C2 reprocessing the week of February 13, 2023 for SNPP and JPSS1.
Status	Major algorithm development completed. Sadashiva Devadiga approved 02/22/2023. Sudipta Sarkar approved 02/17/2023.