MODAPS PCR 17-024
| PCR Number | 17-024 |
|---|---|
| Date | 2017-10-02 |
| Initiator | Zhuosen Wang |
| Abstract | PGE23 v6.0.41. Code change to implement the following functional changes: - Apply new narrow-to-broadband coefficients without band 6 if only band 6 is fill value due to non-functional or noisy detectors and the other bands are valid full or magnitude retrievals. - Set the mandatory QA value to "2" if the other bands are all full inversions and to "3" if one or more of the other bands are magnitude inversions. |
| Problem Statement | MCD43A1 and MCD43A3 products contained striping artifacts in two broadbands - NIR and shortwave - from bad detectors in band 6 of Aqua. |
| Description of Change | New narrow-to-broadband coefficients without band 6 are applied if only band 6 is fill value due to non-functional or noisy detectors and the other bands are valid full or magnitude retrievals. Mandatory QA value of "2" is assigned if the other bands are all full inversions and a value of "3" is assigned if one or more of the other bands are magnitude inversions. |
| Products Affected | MCD43A4 |
| Software Affected | PGE23 v6.0.41 |
| Processing String to Receive the Change | Terra and Aqua Forward Processing. Terra and Aqua Reprocessing. |
| Downstream Product Effects | MCD43C1, MCD43C3 and MCD43D |
| Data Granules to be Used for Science Testing | Run 8-day global test generating the MCD43A1/A2/A3/A4 |
| Justification | Band 6 non-functional or noisy detectors were interpolated in V005 but left as fill value in V006. The broadband NIR and shortwave albedo that use band 6 for narrow-to-broadband conversion could not be derived even when other bands have good retrievals. The new narrow-to-broadband coefficients without band 6 are applied if only band 6 is fill value. The generated broadband NIR and shortwave albedo with and without band 6 narrow-to-broadband coefficients are very close. No spatial striping artifact could be found using the updated PGE. |
| Effective Date for Implementation of Change | Completed. |
| Status | Major algorithm development completed. Sadashiva Devadiga approved on 10/02/2017. Michael King approved 09/28/2017. Gang Ye implemented 10/17/2017. |
