Production | MODAPS Services

MODAPS PCR VNP 26-002

PCR Number	VNP 26-002
Date	2026-04-09
Initiator	Davidson, Carol
Abstract	PGE617 2.0.5 Revised PGE617 to correct memory leaks that appeared to be cause of wrong results occurring for some random 8-day V16A2 and V16A2GF products. New version will be used for periods not yet processed for both SNPP and JPSS1.
Problem Statement	VIIRS PGE617/Evapotranspiration was producing wrong results for some random 8-day tiles. Initially, this issue was corrected in PGE617 v2.0.4, which was thoroughly tested, but when used for SNPP and J1 GF runs for 2025, review of data revealed issue was still present, so further updates were made and now part of PGE617 v2.0.5.
Description of Change	Revised PGE617 to correct memory leaks that appeared to be cause of wrong results occurring for some random 8-day V16A2 and V16A2GF products. New version will be used for periods not yet processed for both SNPP and JPSS1.
Products Affected	VNP16A2, VNP16A2GF, VJ116A2, VJ116A2GF
Software Affected	PGE617 2.0.5
Processing String to Receive the Change	S-NPP Forward Processing. J1 Forward Processing.
Downstream Product Effects	All VIIRS land products
Data Granules to be Used for Science Testing	Science testing was conducted and datasets were reviewed by LDOPE and the science team.
Justification	To correct the random flaws being seen for all products not yet generated.
Effective Date for Implementation of Change	Revised PGE617 2.0.5 was put into use for both SNPP and JPSS1, non-gap filled versions, for 2026-001 onward, which was held awaiting this new version of PGE617 ? so no reprocessing being done. The new PGE617 2.0.4 was used for processing SNPP and JPSS1 gap-filled data for 2025, and will not be regenerated with the newer v2.0.5. PGE617 v2.0.5 is intended for use for the SNPP and JPSS2 gap-filled data for 2026, which will be generated at start of 2027.
Status	Sadashiva Devadiga approved 04/24/2026. Carol Davidson implemented 04/09/2026.