## 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 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 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: 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.

    GMT3.4.6                          1 Jan 2005                            GMT(l)