blockmean

A filter for block averaging (x,y,z) data using L2 norms.

blockmedian

A filter for block averaging (x,y,z) data using L1 norms.

filter1d

A general time domain filter for multiple column time series data.

fitcircle

Finds the mean position and pole of a best-fit great (or small) circle to points on a sphere.

gmt

An overview of all the programs in the package.

gmtdefaults

Lists the current GMT default parameters.

gmtset

Changes individual default parameters.

grd2cpt

Reads a grdfile and creates a color palette file from the values contained therein.

grd2xyz

Converts a grdfile into an ASCII or binary table.

grdclip

Sets values below or above a chosen level to a constant value.

grdcontour

Contours 2-D gridded data sets.

grdcut

Extracts subregions from grdfiles.

grdedit

Modifies the headers of 2-D grdfiles.

grdfft

Performs mathematical operations in the frequency domain on grdfiles.

grdfilter

Filters grdfiles in the time domain.

grdgradient

Computes directional gradients from 2-D grdfiles.

grdhisteq

Finds the data values that divide a given grdfile into patches of equal area, i.e. performs histogram equalization.

grdimage

Creates grayshade or color images from 2-D grdfiles.

grdinfo

Obtains information about the contents of 2-D grdfiles.

grdlandmask

Decides which nodes in specified grids extracted from shoreline databases are over land and water.

grdmask

Creates masking grdfiles from xy paths.

grdmath

A Reverse Polish Notation calculator for grdfiles with a large number of available operations.

grdpaste

Pastes together two grdfiles along a common edge.

grdproject

Performs forward and inverse map transformations of 2-D grdfiles.

grdreformat

Converts between grdfile formats.

grdsample

Resamples a grdfile onto a new grid.

grdtrack

Samples a 2-D grdfile along a 1-D trackline.

grdtrend

Fits and/or removes a polynomial trend in a grdfile.

grdvector

Creates vector field plots from grdfiles.

grdview

Creates a 3-D perspective grayshade or colored image or mesh from a 2-D grdfile.

makecpt

Creates GMT color palette tables.

mapproject

Performs forward and inverse map transformations of 2-D coordinates.

minmax

Finds extreme values in ASCII tables.

nearneighbor

A nearest neighbor gridding algorithm that assigns an average value to each node that has one or more points within a radius centered on the node.

project

Projects data along a line or great circle, generates profile tracks, and translates coordinates.

psbasemap

Plots PostScript base maps.

psclip

Sets up polygonal clip paths.

pscoast

Plots land masses, water bodies, coastlines, borders and rivers.

pscontour

Contours a regular gridded or irregular data set in (x,y,z) format using direct triangulation.

pshistogram

Bins data and plots histograms.

pslib

A library containing a series of tools that can be used to create PostScript plots.

psmask

Clips or masks areas with no data on a map.

psmegaplot

Creates poster-size PostScript plots from page-size plots.

psrose

Plots windrose diagrams and polar histograms.

psscale

Creates grayscales or colorscales for maps.

pstext

Plots text strings on maps.

pswiggle

Plots anomalies along a track on a map.

psxy

Plots lines, polygons, and symbols on maps.

psxyz

Plots lines, polygons, and symbols in 3-D.

sample1d

Resamples 1-D data sets.

spectrum1d

Computes and auto- and cross-spectra from one or two timeseries.

splitxyz

Divides data consisting of (x,y,z) locations and distance headings into (x,y,z) track segments.

surface

A gridding algorithm using adjustable tension continuous curvature surfaces.

trend1d

Fits a weighted or robust polynomial or Fourier model to ASCII data.

trend2d

Fits a weighted or robust polynomial model to ASCII data.

triangulate

Performs optimal Delaunay triangulation and gridding.

xyz2grd

Converts an ASCII or binary table to grdfile format.

Last checked or updated: July 22, 1998

S. Baum
Dept. of Oceanography
Texas A&M University