NAME
mgd77togmt - Convert an MGD-77 ascii file to a binary gmt
file
SYNOPSIS
mgd77togmt [ -Llist ] [ mgd77file ] -Flegid -Ystart_year [
-Ainformation ] [ -Itime_increment ] [ -V ]
DESCRIPTION
mgd77togmt reads an ASCII MGD-77 format file [or standard
input] and creates a binary gmt file. The 16 header records
specified in the MGD-77 documentation may or may not be
present. If two-way travel times are available, mgd77togmt
will convert those to corrected depths using the Carter
tables. Both old and new (Y2K-compiant) MGD-77 files are
supported.
-L Name of file with several records of the format
mgd77file legid start_year. For multiple files, use
this option rather than the -F -Y combination. -F Leg
id that will be used in file name (legid.gmt).
-Y The year of the first data point in the file
OPTIONS
No space between the option flag and the associated argu-
ments.
-A Set an optional 10 character information string to be
stored in the header [Default is blank].
-I Used for files where time is missing. The increment is
used to calculate fake times.
-V Selects verbose mode, which will send progress reports
to stderr [Default runs "silently"].
EXAMPLES
To create a gmt file from the ASCII file c2104.mgd77, try
mgd77togmt c2104.mgd77 -Y1977 -Fc2104
To create new gmt files from all the mgd77-file listed in
list.d, try
mgd77togmt -Llist.d -V
SEE ALSO
dat2gmt, gmt
REFERENCES
Wessel, P., and W. H. F. Smith, 1999, The Generic Mapping
Tools (GMT) version 3.2 Technical Reference & Cookbook,
SOEST/NOAA.
Wessel, P., and W. H. F. Smith, 1998, New, Improved Version
of Generic Mapping Tools Released, EOS Trans., AGU, 79 (47),
p. 579.
Wessel, P., and W. H. F. Smith, 1995, New Version of the
Generic Mapping Tools Released, EOS Trans., AGU, 76 (33), p.
329.
Wessel, P., and W. H. F. Smith, 1995, New Version of the
Generic Mapping Tools Released,
http://www.agu.org/eos_elec/95154e.html, Copyright 1995 by
the American Geophysical Union.
Wessel, P., and W. H. F. Smith, 1991, Free Software Helps
Map and Display Data, EOS Trans., AGU, 72 (41), p. 441.
MGD77 Task Group, 1977, The Marine Geophysical Data Exchange
Format - 'MGD77', Key to Geophysical Records documentation
No. 10, National Geophysical and Solar-Terrestrial Data
Center, Boulder, CO.
Carter, D. J. T., Echo Sounding Correction Tables: Formerly
Matthews' Tables, 150 pp, Hydrographic Department, Ministry
of Defense, Taunton, Somerset, England, 1980.