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 perspec-
tive views in black/white or 24bit color. Linear, log10,
and power scaling is supported in additon to 22 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 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
for 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
sets
grdcontour Contouring of 2-D gridded data sets
grdcut Cut a sub-region from a grd file
grdedit Modify header information in a 2-D
gridded file
grdfft Perform operations 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
sets
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 sets 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 sets
grdvolume Volume calculations from 2-D gridded
data sets
makecpt Make GMT color palette tables
mapproject Transformation of coordinate sys-
tems for table data
minmax Find extreme values in data tables
nearneighbor Nearest-neighbor gridding scheme
project Project data onto lines/great cir-
cles
psbasemap Create a basemap plot
psclip Use polygon files to define clip-
ping paths
pscoast Plot coastlines and filled con-
tinents 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 seg-
ments
surface A continuous curvature gridding
algorithm
trend1d Fits polynomial or Fourier trends
to y = f(x) series
trend2d Fits polynomial trends to z =
f(x,y) series
triangulate Perform optimal Delaunay triangula-
tion and gridding
xyz2grd Convert an equidistant xyz file to
a 2-D grd file
SEE ALSO
Look(l), up(l), the(l), individual(l), man(l), pages(l),
for(l), details.(l) Information is also avaiable on the GMT
World Wide Web home page
(http://www.soest.hawaii.edu/gmt)
REFERENCES
Wessel, P., and W. H. F. Smith, 1999, The Generic Mapping
Tools (GMT) version 3.2 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.