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# 3.1 GMT summary

The following is a summary of all the programs supplied with GMT and a very short description of their purpose. For more details, see the individual UNIX manual pages or the online web documentation. For a listing sorted by program purpose, see Section 3.2.

    blockmean 		 L (x,y,z) table data filter/decimator

    blockmedian 		 L (x,y,z) table data filter/decimator

    blockmode 		 Mode estimate (x,y,z) table data filter/decimator

    filter1d 		 Filter 1-D table data sets (time series)

    fitcircle 		 Finds the best-fitting great or small circle for a set of points

    gmt2rgb 		 Convert Sun raster or grid file to red, green, blue component grids

    gmtconvert 		 Convert data tables from one format to another

    gmtdefaults 		 List the current default settings

    gmtmath 		 Mathematical operations on table data

    gmtselect 		 Select subsets of table data based on multiple spatial criteria

    gmtset 		 Change selected parameters in current .gmtdefaults4 file

    grd2cpt 		 Make color palette table from a grid files

    grd2xyz 		 Conversion from 2-D grid file to table data

    grdblend 		 Blend several partially over-lapping grid files onto one grid

    grdclip 		 Limit the z-range in gridded data sets

    grdcontour 		 Contouring of 2-D gridded data sets

    grdcut 		 Cut a sub-region from a grid file

    grdedit 		 Modify header information in a 2-D grid file

    grdfft 		 Perform operations on grid files in the frequency domain

    grdfilter 		 Filter 2-D gridded data sets in the space domain

    grdgradient 		 Compute directional gradient from grid files

    grdhisteq 		 Histogram equalization for grid files

    grdimage 		 Produce images from 2-D gridded data sets

    grdinfo 		 Get information about grid files

    grdlandmask 		 Create masking grid files from shoreline data base

    grdmask 		 Reset grid nodes in/outside a clip path to constants

    grdmath 		 Mathematical operations on grid files

    grdpaste 		 Paste together grid files along a common edge

    grdproject 		 Project gridded data sets onto a new coordinate system

    grdreformat 		 Converts grid files into other grid formats

    grdsample 		 Resample a 2-D gridded data set onto a new grid

    grdtrack 		 Sampling of 2-D gridded data set along 1-D track

    grdtrend 		 Fits polynomial trends to grid files

    grdvector 		 Plotting of 2-D gridded vector fields

    grdview 		 3-D perspective imaging of 2-D gridded data sets

    grdvolume 		 Calculate volumes under a surface within specified contour

    greenspline 		 Interpolation using Green's functions for splines in 1-3 dimensions

    makecpt 		 Make color palette tables

    mapproject 		 Transformation of coordinate systems for table data

    minmax 		 Report extreme values in table data files

    nearneighbor 		 Nearest-neighbor gridding scheme

    project 		 Project table data onto lines or great circles

    ps2raster 		 Crop and convert PostScript files to raster images, EPS, and PDF

    psbasemap 		 Create a basemap plot

    psclip 		 Use polygon files to define clipping paths

    pscoast 		 Plot (and fill) coastlines, borders, and rivers on maps

    pscontour 		 Contour or image raw table data by triangulation

    pshistogram 		 Plot a histogram

    psimage 		 Plot Sun raster files on a map

    pslegend 		 Plot a legend on a map

    psmask 		 Create overlay to mask out regions on maps

    psrose 		 Plot sector or rose diagrams

    psscale 		 Plot gray scale or color scale on maps

    pstext 		 Plot text strings on maps

    pswiggle 		 Draw table data 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  series

    trend2d 		 Fits polynomial trends to  series

    triangulate 		 Perform optimal Delauney triangulation and gridding

    xyz2grd 		 Convert an equidistant table xyz file to a 2-D grid file

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