MODAPS PCR 15-002
| PCR Number | 15-002 |
|---|---|
| Date | 2015-01-16 |
| Initiator | Sadashiva Devadiga |
| Abstract | PGE43 v5.2.2. Correct the logical shift operation used in the process to extract the row column offset. A latent bug related to the wrong data type for receiving the result of bit shift operation was crashing the code when run on 64 bit systems. The fix corrected this issue and it was tested at LDOPE. |
| Problem Statement | PGE failed to run successfully because of a latent software bug that resulted in retrieval of incorrect row column offset. |
| Description of Change | Fix the logical operations involving bit shifts so the correct row column offsets are extracted from the pointer file data sets. |
| Products Affected | MOD10A1 - L3 daily Snow Cover |
| Software Affected | PGE43 v5.2.2 |
| Processing String to Receive the Change | Terra and Aqua Reprocesssing |
| Downstream Product Effects | None. |
| Data Granules to be Used for Science Testing | Science test run at LDOPE and fix was verified. This is not a science change and hence no downstream impact assessment required.2010-059 |
| Justification | This fix required for smooth operation of the process at MODAPS and avoid any occasional error in snow product and downstream albedo product though the impact is insignificant. |
| Effective Date for Implementation of Change | 2015-01-16 |
| Status | Major algorithm development and testing completed. Sadashiva Devadiga approved on 01/17/2015. Michael King approved on 02/24/2015. |
