MODAPS PCR VNP 23-008
| PCR Number | VNP 23-008 |
|---|---|
| Date | 2023-11-29 |
| Initiator | Carol Davidson |
| Abstract | PGE609 2.0.3, PGE616 2.0.5 Revisions to PGE609/375m LST for NRT and PGE616/L2 LST (NRT and standard) to correct how the GEOS inputs are identified and staged, to help find those closer in time and to stage the earlier file to the GEOS_FILE_1 LUN, and later file to the GEOS_FILE_2 LUN. Additionally, added three new metadata attributes that document which GEOS file is staged for which LUN and the time difference (in hours) between the earlier GEOS file and the granule start time. For PGE609, there is also a code revision to enable reading of geolocation inputs with fill values. |
| Problem Statement | Revisions to PGE609/375m LST for NRT and PGE616/L2 LST (NRT and standard) to correct how the GEOS inputs are identified and staged, add some GEOS related metadata attributes to outputs, and for PGE609, to implement a fix to prevent periodic failures from occurring when inputs have missing data. |
| Description of Change | Revisions to PGE609/375m LST for NRT and PGE616/L2 LST (NRT and standard) to correct how the GEOS inputs are identified and staged, to help find those closer in time and to stage the earlier file to the GEOS_FILE_1 LUN, and later file to the GEOS_FILE_2 LUN. Additionally, added three new metadata attributes that document which GEOS file is staged for which LUN and the time difference (in hours) between the earlier GEOS file and the granule start time. For PGE609, there is also a code revision to enable reading of geolocation inputs with fill values. |
| Products Affected | V[NP|J1]21, V[NP|J1]21_NRT, V[NP|J1]21IMG_NRT |
| Software Affected | PGE609 2.0.3, PGE616 2.0.5 |
| Processing String to Receive the Change | S-NPP Forward Processing. S-NPP Reprocessing. J1 Forward Processing. J1 Reprocessing. NRT |
| Downstream Product Effects | All VIIRS land products |
| Data Granules to be Used for Science Testing | A science test was conducted for both PGE616 (standard and NRT) and PGE609 and results reviewed and signed off on. |
| Justification | Changes for PGE609 are to address periodic failures that would result from a lack of data for the given granule. The changes for both PGE609 and PGE616 for GEOS staging are to improve the data quality by using more timely GEOS inputs, if available, and to have the data staged in the proper sequence. |
| Effective Date for Implementation of Change | PGE609 2.0.3 in VNP/VJ1_L4Inrtglu 2.0.22 to go into nrt processing at leading edge beginning 11/30/23. PGE616 2.0.5 in VNP/VJ1_L4glu 2.0.32, VJ1_L4nrtglu 2.0.22 and VNP_L4nrtglu 2.0.27 went into forward processing in both the standard and NRT starting with data for 11/1/23. When C2 reprocessing resumes for NPP, this new version of PGE616 will be used for it as well for any periods not yet processed. |
| Status | Major algorithm development completed. Glynn Huley approved 12/1/2023. Sadashiva Devadiga approved 01/25/2024. Sudipta Sakar implemented 11/29/2023. |
