IMAPP - International MODIS/AIRS Processing Package has been developed by the University of Wisconsin SSEC group.

IMAPP - allows any ground station capable of receiving direct broadcast from Terra (and Aqua when it is launched) to produce calibrated and geo-located MODIS radiances. IMAPP is derived from the current operational MODIS processing software developed at NASA GSFC, and is modified to be compatible with direct broadcast data. Please see the following website for specific details for running IMAPP on various UNIX platforms: http://cimss.ssec.wisc.edu/~gumley/IMAPP/IMAPP.html.

SeaSpace Corporation has developed a script file – pgs_modis_calib – that employs IMAPP to process MODIS direct broadcast PDS files to calibrated radiances and convert them to earth-located TeraScan Data Format (TDF) datasets as follows:

pgs_modis_calib output is a TeraScan data format (TDF) file that contains 36 calibrated and earth-located MODIS channels (see channel details). The output TDF file will be automatically renamed to the format t1.yyddd.hhmm.RADIANCE_tdf. The script requires the correct setup of the HDF libraries, level1a, geolocation, and calibration executables and ancillary data files. These files are install-specific and any changes made to the directory/file locations also need to be made in the script. For proper earth location, $SATDATA needs to be defined correctly, and orbital elements must be updated daily.

The primary directories for the IMAPP software install are:

Overpasses of arbitrary size may be processed. A typical 10-minute MODIS PDS file takes 80 minutes to generate calibrated radiances. SeaSpace has successfully tested IMAPP on LINUX and SunOS UNIX platforms.

SEE ALSO:

• MODIS_overview

• Creating calibrated MODIS datasets

• IMAPP processing example

Last Update: $Date: 2002/05/07 23:21:22 $