MODAPS PCR 06-023
| PCR Number | 06-023 |
|---|---|
| Date | 2006-12-14 |
| Initiator | Jicheng Liu |
| Abstract | Fix bug that causes too much constraint on retrieved BRDF parameters if one goes negative. |
| Problem Statement | A bug was caught that may cause too much constraint on retrieved BRDF parameters if one of the fully retrieved parameter goes negative. This case happens very rarely (usually under 3 percent). |
| Description of Change | 1. Fixed the bug. 2. Changed the code to do the magnitude inversion if only isotropic parameter is retrieved from the full inversion. 3. Commented out the definitions of unnecessary grid dimensions in metadata. |
| Products Affected | L3 16-day BRDF (MCD43) |
| Software Affected | PGE23 |
| Processing String to Receive the Change | Terra Reprocessing |
| Downstream Product Effects | None. |
| Data Granules to be Used for Science Testing | |
| Justification | The algorithm will have a better performance in the cases that have negativeretrieved BRDF parameters from the full retrievals. Also, if only isotropic parameter is retrieved from the full inversion, the algorithm will do a magnitude inversion instead and a lower quality flag will be assigned. |
| Effective Date for Implementation of Change | Data day 2000-312 for C5 Terra Reprocessing. |
| Status | PI approved. Sadashiva Devadiga approved for Land, Vincent Salomonsom approved on 12/20/06. |
