NAME

       gmt  -  The  Generic Mapping Tools data processing and display software
       package


INTRODUCTION

       GMT is a collection of public-domain Unix  tools  that  allows  you  to
       manipulate x,y and x,y,z data sets (filtering, trend fitting, gridding,
       projecting, etc.)  and produce PostScript  illustrations  ranging  from
       simple  x-y  plots,  via contour maps, to artificially illuminated sur-
       faces and 3-d perspective views in black/white or 24bit color.  Linear,
       log10,  and power scaling is supported in additon to 25 common map pro-
       jections.  The processing and display  routines  within  GMT  are  com-
       pletely general and will handle any (x,y) or (x,y,z) data as input.


SYNOPSIS

       GMT is also a wrapper script that can start any of the programs:

       GMT module module-options

       where  module  is  the  name of a GMT program and the options are those
       that pertain to that particular program.


GMT OVERVIEW

            The following is a summary of all the programs supplied  with  GMT
       and  a  very  short  description of their purpose. Detailed information
       about each program can be found in the separate manual pages.

            blockmean      L2 (x,y,z) data filter/decimator
            blockmedian         L1 (x,y,z) data filter/decimator
            blockmode      Mode (x,y,z) data filter/decimator
            filter1d            Filter 1-D data sets (time series)
            fitcircle           Finds the best-fitting great circle to  a  set
       of points
            gmtconvert          Convert between ASCII and binary 1-D tables
            gmtdefaults         List the current default settings
            gmtmath             Mathematical operations on data tables
            gmtset              Set individual default parameters
            gmtselect      Extract data subsets based on spatial criteria
            grdfilter           Filter 2-D data sets in the space domain
            grd2cpt             Make a color palette table from a grdfile
            grd2xyz             Conversion from 2-D gridded file to table data
            grdclip             Limit the z-range in gridded data
            grdcontour          Contouring of 2-D gridded data
            grdcut              Cut a sub-region from a grd file
            grdedit             Modify header information  in  a  2-D  gridded
       file
            grdfft              Operate on grdfiles in the frequency domain
            grdgradient         Compute directional gradient from grdfiles
            grdhisteq      Histogram equalization for grdfiles
            grdimage       Produce images from 2-D gridded data
            grdinfo             Get information about grd files
            grdlandmask         Create mask grdfile from shoreline data base
            grdmask             Reset nodes outside a clip path to a constant
            grdmath             Mathematical operations on grdfiles
            grdpaste            Paste together grdfiles along a common edge
            grdproject          Project  gridded  data  onto  a new coordinate
       system
            grdreformat         Converting between different grdfile formats
            grdsample      Resample a 2-D gridded data set onto a new grid
            grdtrend            Fits polynomial trends to grdfiles
            grdtrack            Sampling of 2-D data set along 1-D track
            grdvector      Plot vector fields from grdfiles
            grdview             3-D perspective imaging of 2-D gridded data
            grdvolume      Volume calculations from 2-D gridded data
            makecpt             Make GMT color palette tables
            mapproject          Forward or inverse map  projections  of  table
       data
            minmax              Find extreme values in data tables
            nearneighbor        Nearest-neighbor gridding scheme
            project             Project data onto lines/great circles
            psbasemap      Create a basemap plot
            psclip              Use polygon files to define clipping paths
            pscoast             Plot coastlines and filled continents on maps
            pscontour      Contour xyz-data by triangulation
            pshistogram         Plot a histogram
            psimage             Plot images (Sun rasterfiles) on maps
            psmask              Create overlay to mask out regions on maps
            psrose              Plot sector or rose diagrams
            psscale             Plot grayscale or colorscale on maps
            pstext              Plot textstrings on maps
            pswiggle       Draw time-series along track on maps
            psxy           Plot symbols, polygons, and lines on maps
            psxyz               Plot symbols, polygons, and lines in 3-D
            sample1d       Resampling of 1-D table data sets
            spectrum1d          Compute  various spectral estimates from time-
       series
            splitxyz            Split xyz-files into several segments
            surface             A continuous curvature gridding algorithm
            trend1d             Fits polynomial or Fourier trends to y =  f(x)
       data
            trend2d             Fits polynomial trends to z = f(x,y) data
            triangulate         Perform  optimal  Delaunay  triangulation  and
       gridding
            xyz2grd             Convert equidistant xyz data to a 2-D grd file


SEE ALSO

       Look  up the individual man pages for details.  By default, these pages
       are in $GMTHOME/man/manl,  depending  on  your  installation  settings.
       Information is also available on the GMT home page gmt.soest.hawaii.edu
       or locally under $GMTHOME/www/gmt/gmt_services.html


REFERENCES

       Wessel, P., and W. H. F. Smith, 2004, The Generic Mapping  Tools  (GMT)
       version 3.4.5 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  Map-
       ping Tools Released, EOS Trans., AGU, 76 (33), p. 329.
       Wessel,  P.,  and W. H. F. Smith, 1995, New Version of the Generic Map-
       ping 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 Dis-
       play Data, EOS Trans., AGU, 72 (41), p. 441.



VERSION                              DATE                               GMT(l)

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