Suomi National Polar-orbiting Partnership (NPP) Polar2grid Reprojection Software Version 1.2 Release
28 August 2014
Update to the CSPP software release that enables Suomi NPP users to create:
What's new in version 1.2:
- High Resolution VIIRS GeoTIFF files for all Sensor Data Record (SDR) bands, including the Day/Night Band, and
- Gridded VIIRS NetCDF-3 files for a selection of SDR bands suitable for display in the Advanced Weather Interactive Processing System (AWIPS I and II), the US National Weather Service (NWS) Visualization and Analysis Tool.
The software uses standard CSPP or IDPS Sensor Data Records (SDRs) as input, and allows the user a selection of projections or grids to use for the remapping.
The default GeoTIFF projection is the WGS 84/Platte Carrée coordinate system. The execution takes place using simple bash shell scripts, with the user specifying a directory containing the SDR files, or the files themselves. If more than one contiguous granule is provided, it will create an aggregated image or NetCDF file.
- VIIRS 24 bit True Color GeoTIFF creation is now a one step process, with the Corrected REFLectances (CREFLs) created
as part of the crefl2gtiff.sh execution.
- A bug was corrected in the CREFL software that caused strange results in bright sections of true color images. This effect is described in a CSPP Polar2Grid Forum topic.
- VIIRS reprojections can now use either non-terrain corrected (GIMGO, GMODO) or terrain corrected geolocation files (GITCO, GMTCO) as inputs.
- AWIPS NetCDF files are now created using a spherical earth versus an ellipsoid earth transformation. This has improved the MODIS and VIIRS AWIPS product registration.
- Proj4 grid entries used by the polar2grid software now use latitude/longitude degrees as reference coordinates instead of radians. If you are using grids previously defined by the grid_helper.sh script, you will have to define the grids again.
- Fixed problem with 250m MODIS file interpolations from 1km geolocation files that contained missing values.
Software, execution scripts and documentation are included with the release.
This version of the software is being co-released as part of the International MODIS/AIRS Processing Package (IMAPP).