MODAPS PCR VNP 19-001
| PCR Number | VNP 19-001 |
|---|---|
| Date | 2019-12-17 |
| Initiator | Louis Giglio |
| Abstract | PGE510 v2.0.1, PGE510 v2.0.2. New version of PGE510 was delivered with the following changes: 1. Enable it to work with NASA L1B inputs in HDF5/netCDF4 format. 2. Include the land water mask (LWM) from the geolocation (VNP03/VJ103) products instead of the cloud mask, as was being done in AS 5000. 3. Put in a fix to ignore RSB bands during the night time processing 4. Put in a fix to include the inland water bodies as part of LWM that was ignored in #2. PGE510 V2.0.1 was delivered with fixes #1-2, whereas another version V2.0.2 was delivered to account for #3-4. |
| Problem Statement | 1. Generate SNPP VIIRS 375m Active Fire product at LANCE NRT using the NASA L1B to mitigate the frequent false fire generated by the current SNPP AF algorithm that uses IDPS heritage L1 SDR as input. 2. Generate J1 VIIRS 375m Active Fire products at LANCE NRT using the NASA L1B from J1 VIIRS. |
| Description of Change | This new version of PGE510 will use: 1. NASA VIIRS L1B in HDF5/netCDF4 format in place of the IDPS heritage L1 SDR as input L1 data 2. The land water mask (LWM) from the NASA VIIRS geolocation products instead of the IDPS heritage land cloud mask. The V2.0.2 version also include fix to 3. ignore RSB bands during the night time processing 4. include the inland water bodies as part of LWM that was ignored in the version 2.0.1 |
| Products Affected | S-NPP and J1 375 active fire products in NRT, VNP14IMG_NRT and VJ114IMG_NRT respectively. |
| Software Affected | PGE510 v2.0.1 for J1; PGE510 V2.0.2 for S-NPP |
| Processing String to Receive the Change | NRT |
| Downstream Product Effects | None |
| Data Granules to be Used for Science Testing | Science tests have been carried out for both S-NPP and J1, using PGE510 (V2.0.1 and V2.0.2) and all results have been assessed by LDOPE and intimated to the science team. |
| Justification | 1. Need to have an operational V2 J1 active fire product, VJ114IMG_NRT. There has been no VJ114IMG_NRT product prior to this PCR. 2. Need to update the current S-NPP VNP14IMG_NRT, that is based on S-NPP C1 processing, using the IDPS SDRs. This update to C2 PGE510, using NASA L1B as inputs, will also help in alleviating a lot of false fire issues, that were previously seen with IDPS SDR. |
| Effective Date for Implementation of Change | PGE510 V2.0.1 was put in nrt3 for J1 on 12/4/2019. PGE510 V2.0.2 was put in nrt4 for S-NPP on 12/4/2019. |
| Status | Sadashiva Devadiga approved 12/19/2019. Chris Justice approved 01/09/2020. Gang Ye approved on 01/09/2020. |
