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 surfaces 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 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. These  pages  are  in  /usr/share/man/man1/*.1gmt.gz  on  a
       Debian  system.  Information is also available on the GMT home page gmt.soest.hawaii.edu or locally under
       /usr/share/doc/gmt-doc/gmt_services.html if the gmt-doc package is installed.

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 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: 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 Jan 2004                                             GMT(l)