Modules (Classic Mode)

Note

Looking for the modern mode modules like begin and figure? See the equivalent page for modern mode.

This is a list of all GMT “classic mode” core and supplemental modules and their uses, as well as some utility scripts. These modules are fully compatible with GMT 4 and 5. All modules are requested via a call to the gmt program.

Program

• gmt

Core Modules

batch blockmean blockmedian blockmode dimfilter docs filter1d fitcircle gmt2kml gmtbinstats gmtconnect gmtconvert gmtdefaults grdgdal gmtget gmtinfo

gmtlogo gmtmath gmtregress gmtselect gmtset gmtsimplify gmtspatial gmtsplit gmtvector gmtwhich grd2cpt grd2kml grd2xyz grdblend grdclip

grdcontour grdconvert grdcut grdedit grdfft grdfill grdfilter grdgradient grdhisteq grdimage grdinfo grdinterpolate grdlandmask grdmask grdmath

grdmix grdpaste grdproject grdsample grdselect grdtrack grdtrend grdvector grdview grdvolume greenspline kml2gmt makecpt mapproject nearneighbor

project psbasemap psclip pscoast pscontour psconvert psevents pshistogram psimage pslegend psmask psrose psscale pssolar psternary

pstext pswiggle psxy psxyz sample1d spectrum1d sph2grd sphdistance sphinterpolate sphtriangulate surface trend1d trend2d triangulate xyz2grd

Supplemental Modules

earthtide gpsgridder psvelo gshhg img2grd mgd77convert mgd77header mgd77info mgd77list

mgd77magref mgd77manage mgd77path mgd77sniffer mgd77track gmtflexure gmtgravmag3d gravfft gravprisms

grdflexure grdgravmag3d grdredpol grdseamount talwani2d talwani3d pssegy pssegyz segy2grd

pscoupe psmeca pspolar pssac backtracker gmtpmodeler grdpmodeler grdrotater

grdspotter hotspotter originater polespotter rotconverter rotsmoother x2sys_binlist x2sys_cross

x2sys_datalist x2sys_get x2sys_init x2sys_list x2sys_merge x2sys_put x2sys_report x2sys_solve

Utility Scripts

gmt-config

gmt5syntax

gmt_shell_functions.sh

gmtswitch

isogmt

img2google

Plotting

gmtlogo	Plot the GMT logo
grdcontour	Make contour map using a grid
grdimage	Project and plot grids or images
grdvector	Plot vector field from two component grids
grdview	Create 3-D perspective image or surface mesh from a grid
psbasemap	Plot base maps and frames
psclip	Initialize or terminate polygonal clip paths
pscoast	Plot continents, countries, shorelines, rivers, and borders
pscontour	Contour table data by direct triangulation
psevents	Plot event symbols, lines, polygons and labels for one moment in time
pshistogram	Calculate and plot histograms
psimage	Plot raster or EPS images
pslegend	Plot a legend
psmask	Clip or mask map areas with no data table coverage
psrose	Plot a polar histogram (rose, sector, windrose diagrams)
psscale	Plot gray scale or color scale bar
pssolar	Plot day-light terminators and other sunlight parameters
psternary	Plot data on ternary diagrams
pstext	Plot or typeset text
pswiggle	Plot z = f(x,y) anomalies along tracks
psxy	Plot lines, polygons, and symbols in 2-D
psxyz	Plot lines, polygons, and symbols in 3-D

Filtering

blockmean	Block average (x,y,z) data tables by mean estimation
blockmedian	Block average (x,y,z) data tables by median estimation
blockmode	Block average (x,y,z) data tables by mode estimation
dimfilter	Directional filtering of grids in the space domain
filter1d	Time domain filtering of 1-D data tables
grdfilter	Filter a grid in the space (or time) domain

Gridding

greenspline	Interpolate using Green’s functions for splines in 1-3 dimensions
nearneighbor	Grid table data using a "Nearest neighbor" algorithm
sphinterpolate	Spherical gridding in tension of data on a sphere
surface	Grid table data using adjustable tension continuous curvature splines
triangulate	Delaunay triangulation or Voronoi partitioning and gridding of Cartesian data
grdinterpolate	Interpolate a 3-D cube, 2-D grids or 1-D series from a 3-D data cube or stack of 2-D grids

Sampling of 1-D and 2-D data

gmtsimplify	Line reduction using the Douglas-Peucker algorithm
grdsample	Resample a grid onto a new lattice
grdtrack	Sample grids at specified (x,y) locations
sample1d	Resample 1-D table data using splines

Projection and map-transformation

grdproject	Forward and inverse map transformation of grids
mapproject	Forward and inverse map transformations, datum conversions and geodesy
project	Project data onto lines or great circles, or generate tracks

Information retrieval

gmtdefaults	List current GMT default settings
gmtget	Get individual GMT default settings or download data sets
gmtinfo	Get information about data tables
gmtset	Change individual GMT default settings
grdinfo	Extract information from 2-D grids or 3-D cubes
grdselect	Make selections or determine common regions from 2-D grids, images or 3-D cubes

Mathematical operations on tables or grids

gmtmath	Reverse Polish Notation (RPN) calculator for data tables
makecpt	Make GMT color palette tables
spectrum1d	Compute auto- [and cross-] spectra from one [or two] time series
sph2grd	Compute grid from spherical harmonic coefficients
sphdistance	Create Voronoi distance, node, or natural nearest-neighbor grid on a sphere
sphtriangulate	Delaunay or Voronoi construction of spherical data

Convert or extract subsets of data

gmtbinstats	Bin spatial data and determine statistics per bin
gmtconnect	Connect individual lines whose end points match within tolerance
gmtconvert	Convert, paste, or extract columns from data tables
gmtselect	Select data table subsets based on multiple spatial criteria
gmtspatial	Geospatial operations on points, lines and polygons
gmtsplit	Split xyz[dh] data tables into individual segments
gmtvector	Operations on Cartesian vectors in 2-D and 3-D
grd2kml	Create KML image quadtree from single grid
grd2xyz	Convert grid to data table
grdblend	Blend several partially overlapping grids into one larger grid
grdconvert	Convert between different grid formats
grdcut	Extract subregion from a grid or image
grdpaste	Join two grids along their common edge
xyz2grd	Convert data table to a grid

Trends in 1-D and 2-D data

fitcircle	Find mean position and great [or small] circle fit to points on sphere
gmtregress	Linear regression of 1-D data sets
grdtrend	Fit trend surface to grids and compute residuals
trend1d	Fit [weighted] [robust] polynomial/Fourier model for y = f(x) to xy[w] data
trend2d	Fit [weighted] [robust] polynomial for z = f(x,y) to xyz[w] data

Grid operations

grd2cpt	Make linear or histogram-equalized color palette table from grid
grdclip	Clip the range of grid values
grdedit	Modify header or content of a grid
grdfft	Mathematical operations on grids in the spectral domain
grdfill	Interpolate across holes in a grid
grdgradient	Compute directional gradients from a grid
grdhisteq	Perform histogram equalization for a grid
grdlandmask	Create a "wet-dry" mask grid from shoreline data base
grdmask	Create mask grid from polygons or point coverage
grdmath	Reverse Polish Notation (RPN) calculator for grids (element by element)
grdmix	Blending and transforming grids and images
grdvolume	Calculate grid volume and area constrained by a contour

Miscellaneous

batch	Automate batch job processing
docs	Show HTML documentation of specified module
gmt2kml	Convert GMT data table to Google Earth KML file
grdgdal	Execute GDAL raster programs from GMT
gmtwhich	Find full path to specified files
gmtwhich	Find full path to specified files
kml2gmt	Extract GMT table data from Google Earth KML files
psconvert	Convert [E]PS file(s) to other formats using Ghostscript

geodesy

earthtide	Compute grids or time-series of solid Earth tides
gpsgridder	Interpolate GPS strains using Green’s functions for elastic deformation
psvelo	Plot velocity vectors, crosses, anisotropy bars and wedges

GSHHG

gshhg

Extract data tables from binary GSHHG or WDBII data files

IMG

img2grd

Extract a subset from an img file in Mercator or Geographic format

MGD77

mgd77convert	Convert MGD77 data to other formats
mgd77header	Create MGD77 headers from A77 files
mgd77info	Extract information about MGD77 files
mgd77list	Extract data from MGD77 files
mgd77magref	Evaluate the IGRF or CM4 magnetic field models
mgd77manage	Manage the content of MGD77+ files
mgd77path	Return paths to MGD77 cruises and directories
mgd77sniffer	Along-track quality control of MGD77 cruises
mgd77track	Plot track-lines of MGD77 cruises

potential

gmtflexure	Compute flexural deformation of 2-D loads, forces, and bending moments
gmtgravmag3d	Compute the gravity/magnetic anomaly of a 3-D body by the method of Okabe
gravfft	Spectral calculations of gravity, isostasy, admittance, and coherence for grids
gravprisms	Compute geopotential anomalies over 3-D vertical prisms
grdflexure	Compute flexural deformation of 3-D surfaces for various rheologies
grdgravmag3d	Computes the gravity effect of one (or two) grids by the method of Okabe
grdredpol	Compute the Continuous Reduction To the Pole, AKA differential RTP
grdseamount	Create synthetic seamounts (Gaussian, parabolic, polynomial, cone or disc; circular or elliptical)
talwani2d	Compute geopotential anomalies over 2-D bodies by the method of Talwani
talwani3d	Compute geopotential anomalies over 3-D bodies by the method of Talwani

SEGY

pssegyz	Plot a SEGY file in 3-D
pssegy	Plot a SEGY file in 2-D
segy2grd	Converting SEGY data to a grid

seis

pscoupe	Plot cross-sections of focal mechanisms
psmeca	Plot focal mechanisms
pspolar	Plot polarities on the lower hemisphere of the focal sphere
pssac	Plot seismograms in SAC format

spotter

backtracker	Generate forward and backward flowlines and hotspot tracks
gmtpmodeler	Evaluate a plate motion model at given locations
grdpmodeler	Evaluate a plate motion model on a geographic grid
grdrotater	Finite rotation reconstruction of geographic grid
grdspotter	Create CVA grid from a gravity or topography grid
hotspotter	Create CVA grid from seamount locations
originater	Associate seamounts with nearest hotspot point sources
polespotter	Find stage poles given fracture zones and abyssal hills
rotconverter	Manipulate total reconstruction and stage rotations
rotsmoother	Get mean rotations and covariance matrices from set of finite rotations

x2sys

x2sys_binlist	Create bin index listing from track data files
x2sys_cross	Calculate crossovers between track data files
x2sys_datalist	Extract content of track data files
x2sys_get	Get track listing from track index database
x2sys_init	Initialize a new x2sys track database
x2sys_list	Extract subset from crossover data base
x2sys_merge	Merge an updated COEs table (smaller) into the main table (bigger)
x2sys_put	Update track index database from track bin file
x2sys_report	Report statistics from crossover data base
x2sys_solve	Determine least-squares systematic correction from crossovers