MODAPS PCR 2005-01-26
| PCR Number | |
|---|---|
| Date | 2005-01-26 |
| Initiator | Bo-Cai Gao |
| Abstract | Corrected error in converting digital numbers to angular quantities in cirrus detection algorithm. |
| Problem Statement | Changes are made to remove bad lines in the MOD06CD data products and to correct an error in converting digital numbers to angular quantities. |
| Description of Change | Changes to FUNCTION GetGeo_MOD06CD are made so that a correct scaling factor of 0.01 is used during reading of angular quantities. Changes are made to several subroutines and functions so that the algorithm can now properly deal with bad scan lines and partially missing lines. The solar zenith angle processing threshold is now set at 85 degrees. Only pixels with solar zenith angles less than the threshold value are processed. |
| Products Affected | MOD06_L2 |
| Software Affected | PGE06 |
| Processing String to Receive the Change | Terra Reprocessing, Aqua Reprocessing |
| Downstream Product Effects | The downstream Level 3 cirrus reflectance data products will be improved by the removal of bad data lines apparent in global imagery. The Atmosphere L2 Joint Product (MODATML2) contains a subsampled copy of the cirrus reflectance product which represents an enhancement to MODATML2. |
| Data Granules to be Used for Science Testing | Use Atmosphere 18-day science test data set. |
| Justification | Will improve the global cirrus climatology, particularly over high latitude regions. |
| Effective Date for Implementation of Change | Start of C5 Terra and Aqua Reprocessing. |
| Status |
