GMT(1)

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 addition 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
gmt2rgb    Convert Sun rasterfile or grid to r, g, b grids
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
grdblend    Blend several partially over-lapping grdfiles onto one grid
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 (EPS or Sun raster files) on maps
pslegend    Plot legend 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, 2005, The Generic Mapping Tools (GMT) version 4.1 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://www.agu.org/eos_elec/95154e.html, Copyright 1995 by the 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.