NAME

       gmt  -  The Generic Mapping Tools data processing and dis­
       play 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 (filter­
       ing, trend fitting, gridding, projecting, etc.)  and  pro­
       duce  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 projections. The processing and
       display routines within GMT  are  completely  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 grd­
       files
               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 coordi­
       nate 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, 2001, The Generic  Mapping
       Tools  (GMT)  version  3.4 Technical Reference & Cookbook,
       SOEST/NOAA.
       Wessel, P., and W. H. F. Smith, 1998, New,  Improved  Ver­
       sion  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: 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.



                            1 Mar 2002                     GMT(l)

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