MODAPS PCR VNP 25-004
| PCR Number | VNP 25-004 |
|---|---|
| Date | 2025-03-27 |
| Initiator | Carol Davidson |
| Abstract | PGE628 2.0.2 Revised NPP_PRPCL1B/NPP_PRPCL1B_main.cpp in C2 version of PGE628 to change line 836 from : |
| Problem Statement | C2 cross-calibrated L1B PGE628 v2.0.1, which was the version updated to support NRT processing, was put into leading edge processing for standard production on 3/3/25 instead of PGE628 2.0.0 that had been used for all C2 standard processing up to that point. LDOPE quickly flagged that the data from PGE628 2.0.1 in standard processing was not correct and PGE628 2.0.0 was put into use and any data impacted was regenerated for both SNPP and JPSS1. Review of PGE628 2.0.1 was done it was found that the logic implemented in source code to determine if an NRT run or not was not sound. Improved logic was implemented and PGE628 2.0.2 was prepared that would support NRT and standard processing. |
| Description of Change | Revised NPP_PRPCL1B/NPP_PRPCL1B_main.cpp in C2 version of PGE628 to change line 836 from : size_t nrtpos = str_vnp02.find_last_of("\_"); to size_t nrtpos = str_vnp02_file.find(std::string("NRT")); |
| Products Affected | VNP02CCMOD,VNP02CCIMG,VJ102CCMOD,VJ102CCIMG,VNP02CCMOD_NRT,VNP02CCIMG_NRT,VJ102CCMOD_NRT,VJ102CCIMG_NRT |
| Software Affected | PGE628 2.0.2 |
| Processing String to Receive the Change | J1 Forward Processing. |
| Downstream Product Effects | All VIIRS land products. |
| Data Granules to be Used for Science Testing | A science test was conducted of PGE628 2.0.2-0 on nrt4 AS91 and in ops4 AS4074 and results reviewed by LDOPE and the outputs were verified as being of expected quality. |
| Justification | Correction requested by LDOPE after review of ops data using PGE628 v2.0.1 were flagged as bad so that we have one version that can process NRT or standard data properly. |
| Effective Date for Implementation of Change | PGE628 2.0.2 was put into use for C2 NPP and JPSS1 leading edge, both standard and NRT processing, starting 3/25/25. LDOPE has reviewed data produced since the new version went in and confirmed the data is good. This PCR is to document the update and when it went into use. |
| Status | Major algorithm development completed. Implemented 3/25/2025. Unsigned internal PCR per Carol Davidson 3/27/2025. |
