MODAPS PCR 21-016
| PCR Number | 21-016 |
|---|---|
| Date | 2021-03-29 |
| Initiator | Sudipta Sarkar |
| Abstract | PGE132 6.1.23 -- Replace the obsolete calling configuration of the CountPGE() function from: CountPGE('${PreviousPGE[$i]}','$startdate','$enddate',{Tile=>undef,Profile=>1}) >= $TileTotal[$i] To CountPGE('${PreviousPGE[$i]}',{Tile=>undef,PGE_StartTime=>'$startdate',PGE_EndTime=>'$enddate',Profile=>1}) >= $TileTotal[$i] |
| Problem Statement | The operational GIBS L3 Land process for Collection 61 (PGE132 V6.1.23) was showing incomplete coverages for all the Land L3 daily and n-day products on both, NRT and OPS streams, because of a flaw in the PGE132 loader module (LM) that was not checking accurately for the completion status of the upstream PGEs. This happened because of an inadvertent mix-up of the version of "CountPGE()" function in the PGE132 LM. |
| Description of Change | PGE132 V6.1.23 has been updated to use the correct flavor of the "CountPGE()" function, where the arguments are passed correctly to ensure that PGE code does not start running, while the inputs are still coming in. |
| Products Affected | MODIS C6 Land L3 GIBS products |
| Software Affected | PGE132 6.1.23 |
| Processing String to Receive the Change | Terra and Aqua Forward Processing. Terra and Aqua Reprocessing. NRT |
| Downstream Product Effects | None. |
| Data Granules to be Used for Science Testing | The changes for this PGE were tested on nrt4 and also through a dedicated test run on the OPS/STD stream, in AS 1836 and all affected products were successfully confirmed. |
| Justification | The PGE132, operating in the OPS and NRT streams, for C61, were producing incomplete GIBS Land L3 images for several products, as it was not correctly checking on the status of all required inputs and upstream PGEs. An older obsolete version of a function, intended to check the upstream status, was causing this. The correct version of this function was put in and successfully tested in this latest version (V6.1.23). |
| Effective Date for Implementation of Change | As soon as possible from NRT (nrt3/4) and from C61 forward production on OPS. |
| Status | Major algorithm development completed. Sadashiva Devadiga approved on 3/30/2021. Gang Ye approved on 3/30/2021. |
