MODAPS PCR 19-003
| PCR Number | 19-003 |
|---|---|
| Date | 2019-03-11 |
| Initiator | Sudipta Sarkar |
| Abstract | PGE138 v6.1.1 -- PGE revised to correct the issue of file size mismatch and omission errors. |
| Problem Statement | The C6 PGE138 that is used to flag granules from IAM and DMU maneuver days, was failing to execute over certain granules because of error in setting common extent with respect to the historical reference granules. It was also failing to detect certain corrupt granules because of an error in one of the statistical tests. |
| Description of Change | Updated PGE138 with a fix to the issue of wrong file extent by checking and ignoring all reference files that do not satisfy a minimum size threshold check. Added a more robust Welch-t statistical test to correct the omission errors. |
| Products Affected | MOD021KM_NRT |
| Software Affected | PGE138 v6.1.1 |
| Processing String to Receive the Change | Terra and Aqua Forward Processing. |
| Downstream Product Effects | None |
| Data Granules to be Used for Science Testing | Unit test was run with test cases from NRT to verify the fix. |
| Justification | PGE138 6.0.2 version of the code would fail for certain granules because of size mismatch while attempting to tag affected granules. The revised PGE addresses both these issues and adds more robust statistical metric for comparison. |
| Effective Date for Implementation of Change | 2019067 (03/08/2019) |
| Status | Major algorithm development completed. Sadashiva Devadiga approved 03/31/2019. Gang Ye approved on 03/31/2019. |
