MODAPS PCR 17-026
| PCR Number | 17-026 |
|---|---|
| Date | 2017-12-14 |
| Initiator | Bill Ridgway |
| Abstract | PGE04 v6.1.6: Updated MOD_PR04DB code to V6.1.5 |
| Problem Statement | PGE04 v6.1.5 Deep Blue retrievals had an issue where QA was set as QA=1 even when there was no valid retrieval (should be QA=0). It was determined that, in rare circumstances, the Deep Blue algorithm flag was not set correctly leading to the Deep Blue uncertainty SDS not being populated for a small number of pixels. Secondly, a QA logic test between Terra and Aqua was determined to be flawed with Aqua inadvertently using slightly different thresholds. |
| Description of Change | Algorithm logic was corrected to address the flaws reported above. |
| Products Affected | MOD_PR04DB (Deep Blue algorithm) |
| Software Affected | PGE04 v6.1.6 |
| Processing String to Receive the Change | Terra and Aqua Forward Reprocessing. Terra and Aqua Reprocessing. NRT |
| Downstream Product Effects | Subset MxDATML2 and all Level 3 products |
| Data Granules to be Used for Science Testing | A one-day Science test (AS1572) was run for Terra and Aqua Day 2008/346 |
| Justification | Deep Blue Uncertainty SDS is important to some users (data assimilation teams, etc). |
| Effective Date for Implementation of Change | Forward Processing: Target date for implementation is 1/1/2018 Re-Processing: No active Terra reprocessing. Use immediately for start of Aqua C6.1 reprocessing NRT Processing: NRT Target date for implementation is 1/1/2018 |
| Status | Major algorithm development completed. Steve Platnick approved 12/18/2017. Michael King approved on 12/18/2017. Gang Ye implemented 01/03/2018. |
