$Id: README.mgd77,v 1.18 2011/03/04 06:47:15 guru Exp $ README file for GMT supplemental mgd77 programs. Distributed under the GNU Public License (see file ../LICENSE.TXT) AUTHORS: Paul Wessel and Michael Chandler DATE: 01-MAY-2009 VERSION: 1.5 INSTALL INFO: The mgd77 directory should install under GMT/src These programs are intended for use with the marine geophysical data files known as MGD77 files. These data files are NOT supplied with GMT; they are the MGD-77 standard exchange format files provided by the National Geophysical Data Center*. The programs greatly extends the functionality of the mgg supplement but uses the actual MGD77 data files. We also introduce a new format for such data using the netCDF library. Unlike the original MGD77 files, the netCDF-based versions (called mgd77+ files) can hold additional columns supplied by the user. The following is a list of the programs and a short description of what they do: mgd77convert A utility to create .mgd77+ files from MGD77 files mgd77list A data extractor for .mgd77[+] files mgd77info An information extractor for .mgd77[+] files mgd77path Gets the full pathnames for .mgd77[+] files mgd77magref A utility to evaluate geomagnetic reference fields mgd77manage A utility to manage extra columns in .mgd77+ files mgd77sniffer A utility for quality control of MGD77 files mgd77track A track plotter for .mgd77[+] files man-files for all the above programs can be found in the manl subdirectory. An overview of the package can be found in: Wessel, P., and M. T. Chandler (2007), The mgd77 supplement to the Generic Mapping Tools, Computers & Geosciences, 33(1), 62-75. Note that the functionality provided by the mgg supplement's gmt2bin, binlegs and getlegs have now been generalized to any track data by the tools in the x2sys package. The support file mgd77_paths.txt is put in the GMT/share/mgd77 subdirectory directory. To install these programs, simply type make install To install the manpages, type make install-man * Available on CD-ROM from NGDC (www.ngdc.noaa.gov).
