MODAPS PCR 19-022
| PCR Number | 19-022 |
|---|---|
| Date | 2020-01-31 |
| Initiator | Sudipta Sarkar |
| Abstract | 1. All land PGEs updated to reflect collection specific metadata changes and correct SDS attributes scale, offset, fill value, unit and valid range 2. L2 PGEs updated to read and process C61 version of the L1B and geolocation product. 3. Snow PGEs updated to reduce ice/now commission errors and developed a new Cloud Gap filled daily L3 product (MxD10A1F) 4. Fix known issues in DSR/PAR (MCD18) process, generate the product at 1km resolution and generate new CMG products 5. Update the JPL-LST process (MxD21) to use GEOS data in place of MERRA2 as ancillary, and develop new process to generated daily, 8-day and monthly CMG products. 6. Update the VCF intermediate 16-day composite process to fix a known bug in the LWM which is also put in C6 forward processing starting Jan 2019 7. Update VI code to fix known product issues and improve product quality. The change was put in C6 forward processing starting day 2017254 8. Update BRDF PGE to take into account the dead detector in band 5, while estimating the narrow to broad band coefficients 9. L2 Surface Reflectance updated to use a new approach to flag the aerosol quantiy in the L2 swath product. 10. L3 CMG daily snow process updated to fix error in flagging of the inland water bodies. |
| Problem Statement | Generate improved version of the C6 MODIS land products through Collection 61 reprocessing using the C61 version of L1 products as input and land product specific changes recommended by the MODIS land science team. |
| Description of Change | Update land C6 PGEs with C61 specific changes 1. All land PGEs updated to reflect collection specific metadata changes and correct SDS attributes scale, offset, fill value, unit and valid range 2. L2 PGEs updated to read and process C61 version of the L1B and geolocation product. 3. Snow PGEs updated to reduce ice/now commission errors and developed a new Cloud Gap filled daily L3 product (MxD10A1F) 4. Fix known issues in DSR/PAR (MCD18) process, generate the product at 1km resolution and generate new CMG products 5. Update the JPL-LST process (MxD21) to use GEOS data in place of MERRA2 as ancillary, and develop new process to generated daily, 8-day and monthly CMG products. 6. Update the VCF intermediate 16-day composite process to fix a known bug in the LWM which is also put in C6 forward processing starting Jan 2019 7. Update VI code to fix known product issues and improve product quality. The change was put in C6 forward processing starting day 2017254. 8. Update BRDF PGE to take into account the dead detector in band 5, while estimating the narrow to broad band coefficients 9. L2 Surface Reflectance updated to use a new approach to flag the aerosol quantiy in the L2 swath product. 10. L3 CMG daily snow process updated to fix error in flagging of the inland water bodies. |
| Products Affected | All products |
| Software Affected | All software |
| Processing String to Receive the Change | Terra and Aqua Forward Processing. Terra and Aqua Forward Reprocessing. |
| Downstream Product Effects | All products |
| Data Granules to be Used for Science Testing | Series of sciene test run generating global data from winter and summer period. |
| Justification | The land products are being reprocessed through this minor reprocessing campaign (Collection 61) mainly to address known issues and inconsistencies in the C6 L1B products revealed by the MODIS Calibration Science Team (MCST) after the completion of the C6 reprocessing. This reprocessing will also include improvements to some of the land products from code change to address known issues in the operational C6 products and make additional new land products not generated in the C6 reprocessing. Some of the C61 calibration changes and the land product specific changes were put in operation in the C6 forward processing. The C61 reprocessing when completed is expected to provide user with temporally consistent set of land product suite from the full mission period of Terra and Aqua |
| Effective Date for Implementation of Change | Significant, but completed |
| Status | Major algorithm development completed. Sadashiva Devadiga approved on 10/16/2019, updated 01/31/2020. Chis Justice approved 01/31//2020. Gang Ye approved on 02/03/2020. |
