MODAPS PCR 15-011
| PCR Number | 15-011 |
|---|---|
| Date | 2015-04-07 |
| Initiator | Zhuosen Wang |
| Abstract | PGE82 v6.0.2. Exclude reflectance observations flagged as dead detectors from processing by checking for individual band quality flag in the input daily surface reflectance product. Update QA metadata description. |
| Problem Statement | Daily BRDF-Albedo CMG products generated by the on-going C6 reprocessing is contaminated by observations from dead and noisy detectors. |
| Description of Change | Changes to PGE82 to exclude daily intermediate BRDF/Albedo retrievals contaminated by reflectance inputs flagged as dead detectors in generation of the CMG products. |
| Products Affected | MCD43C3, MCD43C4 |
| Software Affected | PGE82 v6.0.2 |
| Processing String to Receive the Change | Terra Reprocessing and Aqua Reprocessing |
| Downstream Product Effects | None. |
| Data Granules to be Used for Science Testing | Process 8-day period starting data day 2001193 generating the BRDF-Albedo product for all land tiles for each of the data day using the 16-day input from the C6 archive.2010-059 |
| Justification | Observations from dead and noisy detectors could have small values in the valid range for reflectance in the input daily surface reflectance product. These observations, if not removed through proper check of quality flags, could be used as good observations thereby contaminating the retrieved BRDF/Albedo. These contaminated retrievals could appear as stripes in the output BRDF/Albedo product. Putting this change for operational processing at an arbitrary data day in the on-going C6 reprocessing could potentially result in temporal inconsistency in the records. Hence re-reprocessing of back dates is requested. |
| Effective Date for Implementation of Change | Completed. |
| Status | Major algorithm development completed. Michael King approved on 04/23/2015. |
