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


       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.


       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.


               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


       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    or    locally    under    /usr/share/doc/gmt-
       doc/gmt_services.html if the gmt-doc package is installed.


       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)