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SeaDAS Unix Utility Programs

SeaDAS includes a variety of Unix utility programs (binaries and shell scripts) available via the Unix command-line. These utilities can be especially helpful when used in conjunction with other commands for automating data processing and manipulation. (Often the best way to automate data processing is by writing a master Unix shell script that makes use of a mixture of SeaDAS Unix processing commands, SeaDAS IDL commands, native IDL commands, and perhaps some of the SeaDAS Unix utilities in the table below.)

As of SeaDAS 5.2 certain utilities have been renamed and these changes are summarized here and are also noted in the following table.

Unix binary or shell script Description
addsecs Generates new date string with specified number of seconds added or subracted
date2jd Converts "mmdd yyyy" string to day of year
jd2date Converts day of year string to "mmdd yyyy"
l0chunk_modis  (was write_5min_gran) Creates multiple L0 MODIS granules of specified length from input granule
l0info_seawifs  (was SWl0info) Prints summary information for L0 SeaWiFS file
l0merge_seawifs Merges multiple L0 SeaWiFS files into one output file
l0regen_seawifs  (was l1atol0) SeaWiFS L1A to L0 file regeneration
l1brsgen  (was msl1brsgen) Produces a PPM- or HDF-formatted RGB image from a L1A (or L1B MODIS) file
l2brsgen Produces a PPM- or HDF-formatted L2 product image from a L2 file
l1info  (was msl1info) Prints summary information for any L1 file
l1mapgen  (was msl1tcpcbox) Produces a PPM-formatted RGB image rendered in a Plate Carrée projection
l2mapgen Produces a PPM-formatted L2 product image rendered in a Plate Carrée projection
lonlat2pixline  (was msscanpixlimits) Converts lat/lon coordinates to pixel/line coordinates for L1 or L2 files
modis_timestamp Prints time string of the first scanline for the input MODIS L1A or L1B file
modis_update_luts.csh Checks for/retrieves/activates new MODIS L1B calibration LUTs
modis_update_utcpole_leapsec.csh Downloads current utcpole.dat and leapsec.dat files for MODIS geolocation processing
ms_met.csh Auto-ancillary meteorological data determination/retrieval for use with l2gen Unix binary
ms_ozone.csh Auto-ancillary ozone data determination/retrieval for use with the l2gen Unix binary
ms_oisst.csh Auto-ancillary SST data determination/retrieval for use with the l2gen Unix binary
ncdump Prints HDF data and metadata in ASCII format (e.g. 'ncdump -h file.hdf' prints header info)
seawifs_update_elements_orbit.csh Downloads current elements.dat and orbit_table.dat files for SeaWiFS l1agen processing


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Updated: 27 March 2008
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