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Enhancements to this SPA include the addition of:
1. Command line parameters that allow users to specify:
2. Command line parameters that allow users to enable the following features:
3. Meaningful HDF dimension names to HDF output files.
4. Global metadata to the output file.
5. Range checking to various user-specified parameters.
The CREFL_SPA processes MODIS Aqua and Terra Level 1B DB data to create the MODIS Level 2 Corrected Reflectance product. The algorithm performs a simple atmospheric correction with MODIS visible, near-infrared, and short-wave infrared bands (bands 1 through 16). The algorithm allows users to specify the bands to be used in the making of the output product, using a comma-separated list of bands 1-16. It corrects for molecular (Rayleigh) scattering and gaseous absorption (water vapor and ozone) using climatological values for gas contents. It requires no real-time input of ancillary data. The algorithm performs no aerosol correction. The Corrected Reflectance products created by CREFL_SPA are very similar to the MODIS Land Surface Reflectance product (MOD09) in clear atmospheric conditions, since the algorithms used to derive both are based on the 6S Radiative Transfer Model. The products show differences in the presence of aerosols, however, because the MODIS Land Surface Reflectance product uses a more complex atmospheric correction algorithm that includes a correction for aerosols. The CREFL_SPA functions in two modes: Standalone, or as an IPOPP plug-in.
Download the CREFL_1.7.1_SPA_1.1.tar.gz and CREFL_1.7.1_SPA_1.1_testdata.tar.gz (optional) files into the same directory.
Decompress and un-archive the CREFL_1.7.1_SPA_1.1.tar.gz and CREFL_1.7.1_SPA_1.1_testdata.tar.gz (optional) files:
$ tar -xzf CREFL_1.7.1_SPA_1.1.tar.gz
$ tar -xzf CREFL_1.7.1_SPA_1.1_testdata.tar.gz
See the PDF document included within the software package for more details.
In order to run the package using your own input data, you can either use the 'run' scripts within the wrapper subdirectories, or modify the test scripts within the testscripts subdirectory. See the PDF document included within the software package for more details.