MODAPS PCR VNP 24-016
| PCR Number | VNP 24-016 |
|---|---|
| Date | 2024-11-20 |
| Initiator | Carol Davidson |
| Abstract | PGE554 2.0.14 Revised NPP_PRDNBdaily/DNBdaily_main.c in C2 version of PGE554 to revise: Moon_Phase_Angle set valid_min attribute value to 0; DNB_At_Sensor_Radiance set scale_factor attribute value to 1; QF_Cloud_Mask Units attribute value set to "flag, no units" and bit13 change to "lunar eclipse detected, bits 11-13: 1=Yes; 0=No"; QF_DNB and QF_VIIRS_M* set of datasets, Units attribute value set to "flag, no units"; UTC_Time added valid_max attribute, value 24; lat dataset added_FillValue attribute, value -999.9, valid_max attribute, value 90, and valid_min attribute, value -90; lon dataset added _FillValue attribute, value -999.9, valid_max attribute, value 180, and valid_min attribute, value -180; |
| Problem Statement | C2 Daily gridded DNB/CM, VNP46A1, VJ146A1, and extended test J2 product, VJ246A1, were flagged for needing some metadata attributes revised based on LDOPE feedback. |
| Description of Change | Revised NPP_PRDNBdaily/DNBdaily_main.c in C2 version of PGE554 to revise: Moon_Phase_Angle set valid_min attribute value to 0; DNB_At_Sensor_Radiance set scale_factor attribute value to 1; QF_Cloud_Mask Units attribute value set to "flag, no units" and bit13 change to "lunar eclipse detected, bits 11-13: 1=Yes; 0=No"; QF_DNB and QF_VIIRS_M* set of datasets, Units attribute value set to "flag, no units"; UTC_Time added valid_max attribute, value 24; lat dataset added_FillValue attribute, value -999.9, valid_max attribute, value 90, and valid_min attribute, value -90; lon dataset added _FillValue attribute, value -999.9, valid_max attribute, value 180, and valid_min attribute, value -180; |
| Products Affected | VNP46A1, VJ146A1 and VJ246A1 |
| Software Affected | PGE554 2.0.14 |
| Processing String to Receive the Change | S-NPP Forward Processing. J1 Foward Processing. J2 Forward Processing. J2 Reprocessing. NRT |
| Downstream Product Effects | All VIIRS land products. |
| Data Granules to be Used for Science Testing | A science test was conducted of PGE554 2.0.14-0 and results reviewed by LDOPE and the LBAN science team. |
| Justification | Correction requested by LDOPE after review of data found the discrepancies for assorted dataset attributes. |
| Effective Date for Implementation of Change | PGE554 2.0.14 was put into use for C2 NPP and JPSS1, and JPSS2 extended test archive as well as the NRT3/4 machines for start use 11/19/24. No reprocessing is to be done with this version of PGE554 in any collection. |
| Status | Major algorithm development completed. Sadashiva Devadiga approved 11/22/2024. Sudipta Sakar implemented 11/20/2024. |
