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Enhancements to this SPA include support for NOAA-20 (JPSS-1) VIIRS data processing. The NOAA-20 algorithm is an engineering version.
The Visible Infrared Imaging Radiometer Suite (VIIRS) Vegetation Index (VI) Science Processing Algorithm (VEGINDEX_SPA) takes as inputs VIIRS I1 and I2 band Sensor Data Record (SDR) products; the VIIRS I-band Terrain-Corrected Geolocation product; and the VIIRS Surface Reflectance Intermediate Product (IP) and produces the mission-compliant VIIRS Vegetation Index EDR product. The SPA supports both the SNPP and NOAA-20 (also called JPSS-1) missions; it can process VIIRS inputs from either spacecraft. The SPA functions in two modes: Standalone, or as an IPOPP plug-in (IPOPP v2.6 or later required).
Follow the instructions below to install the SPA in a standalone configuration. SPAs may also be installed dynamically into an IPOPP framework; instructions for this type of installation are contained in the IPOPP User's Guide. Download the VEGINDEX_1.5.08.04_SPA_1.4.tar.gz and VEGINDEX_1.5.08.04_SPA_1.4_testdata.tar.gz (optional) files into the same directory.
Decompress and un-archive the VEGINDEX_1.5.08.04_SPA_1.4.tar.gz and VEGINDEX_1.5.08.04_SPA_1.4_testdata.tar.gz (optional) files:
$ tar -xzf VEGINDEX_1.5.08.04_SPA_1.4.tar.gz
$ tar -xzf VEGINDEX_1.5.08.04_SPA_1.4_testdata.tar.gz
See the User's Guide (PDF) included with the software package for more details. Installing into an IPOPP Framework:
This SPA can also be installed dynamically into an IPOPP framework to automate production of VEGINDEX_SPA data products. The SPA installation process will install SPA station(s) into IPOPP. An SPA station is an IPOPP agent that provides the mechanism necessary for running an SPA automatically within the IPOPP framework. Once this SPA is installed, users must enable the station(s) corresponding to the SPA. Instructions for installing an SPA and enabling its stations are contained in the IPOPP User’s Guide (available on the DRL Web Portal). The SPA stations for this SPA are listed in Appendix A of the User's Guide (PDF) included with this software package.
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 User's Guide (PDF) included with the software package for more details.