GMT information
GMT (Generic Mapping Tools)
GMT (Generic Mapping Tools) is a powerful data mapping tool package on UNIX system. It is developped by Wessel and Smith (EOS, v.72, p.441-446, 1991) and freeware! Current version is 3.0 (1995/08).
You can get a brief introduction of GMT 3.0 by authors on AGU, EOS electric supplement.New Version of the Generic Mapping Tools Releasedon Aug 15, 1995.
Japanese version of this page is here.
GMT has various strong points,
- High quality ("camera-ready") PostScript output.
- Fit to process geophysical data.
- Support various geographical map projections.
- Support 3D plot with mesh, surface plot.
- Powerful gridding functions.
- Grid, image data manupilation.
- Support 24bit color.
- Contains resolution selectable coastline data.
- Portable among various UNIX systems.
- NetCDF binary data support.
To demonstrate the power of GMT, check the example figures of Tutorial and Cookbook of GMT v.3.
- Example 01 Lower Order Geoid
Contour map
- Example 02 Hawaiian Topo and Geoid
Imaging
- Example 03 Ship and Satellite Gravity
Spectral estimation and x-y plot
- Example 04 Hawaiian Ridge Topography
3-D perspective (mesh plot)
- Example 05 Surface given by function
3-D perspective (surface plot)
- Example 06 Two types of histograms
Histogram plot
- Example 07 Seismicity of MAR
Location map
- Example 08 3D histogram
3-D histogram
- Example 09 Geosat data profile
Time-series plot along tracks
- Example 10 AGU Membership Distribution
Geographical bar graph
- Example 11 Color cube
3-D color cube
- Example 12 Delaunay Triangulation
Optimal triangulation
- Example 13 z(x,y)=x*exp(-x2-y2)
Vector field plot
- Example 14 Contouring of Random data
Data gridding and trend surface
These example figures were output as PostScript files. They were converted into sunraster format file with ps2ras command of GMT. Further, sunraster files were converted GIF format files with the commands of pbmplus package.
Original demo of GMT
Movie
- plate.mpg Movie of earth view with plate boundary
MPEG version (151 kB)
- plate.qt Movie of earth view with plate boundary
QuickTime version (391 kB)
- Rotating Earth with plate boundaries. Movie of earth view with plate boundary. Look with the Java enhanced browser as Netscape Navigator 2.x.
Bathymetric data around Japan
Bathymetric data around Japan and some sample images are available at guide of bathymetric data.
The grid file was compiled by M. Komazawa, K. Kisimoto (GSJ) and A. Nishizawa (JHD).
World gravity anomaly data by Sandwell and Smith
World gravity anomaly data with a sample image are available at guide of world gravity data.
World plate boundaries, magnetic lineations, fracture zones
World plate boundaries, magnetic lineations, and fracture zones can be plotted with GMT and the data files which were compiled by NOAA. Read plates page.
Don't you want to use GMT? If you are at the site where GMT is installed, start to use it with GMT Technical Reference and Cookbook in gmt/docs directory. If you are not at such site, try to get GMT and install on your machine.
GMT package is available from following anonymous FTP site.
FTP for GMT at SOEST, University of Hawaii.
GSJ Home Page.
Revised on 1995/12/05
This page is prepared by Manabu Tanahashi, tana@gsj.go.jp
