MODAPS PCR 20-017
| PCR Number | 20-017 |
|---|---|
| Date | 2020-08-11 |
| Initiator | Jim Ray |
| Abstract | PGE11 6.4.9 -- 1. qa_map.h: Changed instances of "aerosol quantity" to "aerosol quantity:level of uncertainty in aerosol correction". 2. versions.h: Updated the PROCESSVERSIONNUMBER to 6.4.9 3. M{OY}D09.fs, M{OY}D09ID{NTS}.fs: Changed instances of "aerosol quantity" to "aerosol quantity:level of uncertainty in aerosol correction" |
| Problem Statement | Explanation for QA flags in the SDS attribute needed to be updated to reflect the code change to flag the aerosol impact in the C61 L2 LSR process (PGE11 (L2 LSR - ref PCR# 19-022). |
| Description of Change | Change the current description of the aerosol QA bit level quantification flags from "aerosol quantity" to "aerosol quantity: level of uncertainty in aerosol correction". |
| Products Affected | MODIS C61 MxD09 suite of products. |
| Software Affected | PGE11 6.4.9 |
| Processing String to Receive the Change | Terra and Aqua Forward Processing. Terra and Aqua Forward Reprocessing. |
| Downstream Product Effects | None |
| Data Granules to be Used for Science Testing | A small science test was carried out in AS 1789, to confirm the intended change and also to confirm that the core science data is essentially the same as what has been obtained in C61 re-processing thus far |
| Justification | SDS attributes for the SDS "Aerosol Quantity" in the L2 surface reflectance product needs to be restated so the bit QA values could be correctly interpreted and used by the product users. This is only an update to SDS attribute and has no impact on the science data. This change to update the explanation for the QA flag is required both in the SDS attribute within the data product and in the user guide |
| Effective Date for Implementation of Change | As soon as possible in the current leading edge of C61 re-processing, as of drafting this PCR (08/11/2020) |
| Status | Major algorithm development completed. Sadashiva Devadiga approved on 08/18/2020. Gang Ye approved on 08/27/2020. |
