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)

Man(1) output converted with man2html