Polar2grid Reprojection Software Version 2.0 Release 12 October 2015
The IMAPP Polar2Grid Software was created to enable Polar Orbiter Satellite Imager users (MODIS,VIIRS and AVHRR),
including the US National Weather Service (NWS), the capability to easily create high quality reprojected imagery.
NASA has funded this effort to create an open-source, modular application system. This bundled solution automates
tools for converting satellite data such as Aqua and Terra MODIS into a variety of output formats, including GeoTIFFs,
AWIPS compatible NetCDF files, NinJo forecasting workstation compatible TIFF images, as well as binary and HDF5 files.
In addition to traditional visible and infrared imagery, the software provides the capability to create sharpened
true color, sharpened false color, and user-defined RGB images.
What is new in Version 2.0:
Polar2Grid Version 2.0 is a significant revision of the original software. Because of the expansion of
input and output products supported, execution is now more complex; commands that you may have used in
previous versions may require modifications. Wherever possible, we have tried to maintain consistency
of execution across all front and back end data sets.
Features of Polar2Grid
- KMZ, HDF5 and binary output formats can be created.
- A new dynamic VIIRS Day/Night Band enhancement option, provided by Dr. Curtis Seaman of the Cooperative Institute for Research in the Atmosphere (CIRA), is now available.
- MODIS corrected reflectance software execution is now included as part of true color and false color image creation.
- Output file naming conventions have changed to reflect the vast number of data and products that are supported.
- MODIS L1B file naming conventions can be either IMAPP or NASA archive.
- MODIS and VIIRS 24 bit false color image creation is now supported.
- Users must now provide the input Level 1b matching geolocation files in the file argument list.
- Because of the improvement in efficiency of the software, the --num-procs optional argument has been removed.
- Support for AVHRR Level 1b from NOAA-18, NOAA-19, Metop-A and Metop-B satellites is now included.
- The software is modular, robust and efficient.
- Supported satellite imagers include MODIS, VIIRS and AVHRR.
- Execution is performed through simple bash shell scripts, wrapping python underlying modules. For example,
to create GeoTIFF files of Aqua MODIS IR Band 27 and Visible Band 1 using the default Platte Carrée (Google Earth) projection, you can execute a command like this:
modis2gtiff.sh -p bt27 vis01 -f /modis/data/t1.15285.1735.1000m.hdf /modis/data/t1.15285.1735.geo.hdf
- True color and False color reprojections can be created using a single command.
- Users can define their own grids. A grid definition helper script is included with the package.
- Proj4 grid definitions can be used.
- More complete technical documentation is available at the Polar2Grid website.
- The Polar2Grid open source software code repository is also available through github at: http://github.com/davidh-ssec/polar2grid.
Standard IMAPP or NASA Archive HDF4 files can be used as input. Users have a selection of projections or grids to use for the remapping. The default GeoTIFF projection is the WGS 84/Platte Carrée coordinate system.
Software, execution scripts and documentation are included with the release.
This software is being co-released as part of the Community Satellite Processing Package (CSPP).