MODAPS PCR 21-019
| PCR Number | 21-019 |
|---|---|
| Date | 2021-07-13 |
| Initiator | Sudipta Sarkar |
| Abstract | PGE36 6.1.5, PGE37 6.1.5, PGE38 6.1.5 Added the FATAL ERROR output to log files and to exit the A2 processes when "Days_8_sum" from A1 files exceeds the standard number of days of 8 (5 or 6 for the last 8-day of the year). Similarly, output FATAL ERROR to log files and to exit the A3 processes when "Days_ann_sum" from A1 files exceeds 365 or 366. |
| Problem Statement | On a number of occasions, the daily intermediate update files, needed, for the generation of the 8-day and annual products, would overshoot a given 8-day boundary and assimilate more days than 8 (8-day product) or 365/366 (annual product). This would lead to incorrect estimations of parameters in the 8-day products as well as in the annual product. |
| Description of Change | In order to prevent such erroneous estimation of the science parameters, caused by the incorrect, out-of-sequence running of the daily update process, a check was added to the 8-day and the annual processes to throw a fatal error and exit, when the number of days, counted by the daily update process, was found to be more than 8 or 365/366 respectively. |
| Products Affected | Gap-filled and regular C61 MxD17A1H* (daily-intermediate), MxD17A2H* (8-day), and MxD17A3H* (annual) products. |
| Software Affected | PGE36 6.1.5; PGE37 6.1.5; PGE38 6.1.5 |
| Processing String to Receive the Change | Terra and Aqua Forward Processing. Terra and Aqua Reprocessing. |
| Downstream Product Effects | None |
| Data Granules to be Used for Science Testing | Science test was skipped, and unit tests were performed by LDOPE and STIG, as the changes were not pervasive and does not affect the science retrieval. |
| Justification | The included change, to allow the 8-day and the annual process (PGE37/PGE38) to exit with fatal error, was needed to prevent overestimation of different science parameters, because of possible overshooting of the daily update process. |
| Effective Date for Implementation of Change | PGE36/37/38 (V6.1.5) were inducted for C61 re-processing and forward processing, since 05/05/2020 (DOY 2020125). |
| Status | Major algorithm development completed. Sadashiva Devadiga approved on 07/13/2021. Gang Ye approved on 07/14/2021. |
