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See #4349 for context.  This PR adds the missing check on left.  Closes #4349.

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README.md

GMT logo

Generic Mapping Tools

Azure CodeCov Coverity Documentation (development version) GitHub release

What is GMT?

GMT is an open source collection of about 90 command-line tools for manipulating geographic and Cartesian data sets (including filtering, trend fitting, gridding, projecting, etc.) and producing high-quality illustrations ranging from simple x–y plots via contour maps to artificially illuminated surfaces and 3D perspective views. The GMT supplements add another 50 more specialized and discipline-specific tools. GMT supports over 30 map projections and transformations and requires support data such as GSHHG coastlines, rivers, and political boundaries and optionally DCW country polygons.

GMT is developed and maintained by the GMT Team, with help from a global set of contributors and support by the National Science Foundation.

The GMT World Domination

Considering its flexibility at no charge, people worldwide are using GMT in their work and at home. Most users of GMT are Earth, ocean or planetary scientists, but there are apparently no limits to the kind of applications that may benefit from GMT. We know GMT is used in medical research, engineering, physics, mathematics, social and biological sciences, and by geographers, fisheries institutes, oil companies, a wide range of government agencies, and last but not least innumerable hobbyists.

Installation

GMT has been installed successfully under UNIX/Linux/macOS on workstations. It also installs under Windows and in UNIX emulators such as Cygwin or on virtual machines. We anticipate few problems if you are installing the package on other platforms.

Note there are three GMT tar archives available (#3 is optional):

  1. gmt-6.x.x.tar.gz: The GMT 6 distribution
  2. gshhg-gmt-2.x.x.tar.gz: All five resolutions of GSHHG coastline data
  3. dcw-gmt-1.x.x.tar.gz: Digital Chart of the World polygon data

For macOS and Windows users there are separate installers available. You can obtain GMT and support data from the GMT main site.

Refer to the install instructions to install GMT, and build instructions to build GMT from the sources.

Citation

If you think it is appropriate, you may consider paying us back by including our latest article in the reference list of your future publications that will benefit from the availability of GMT:

Wessel, P., Luis, J. F., Uieda, L., Scharroo, R., Wobbe, F., Smith, W. H. F., & Tian, D. (2019). The Generic Mapping Tools version 6. Geochemistry, Geophysics, Geosystems, 20, 5556–5564. https://doi.org/10.1029/2019GC008515

Software support

You haven't bought anything so you cannot expect full service. However, if you find a bug in any of the programs, please report it to us by opening an issue rather than trying to fix it yourself so that we, and through us, other users may benefit from your find. Make sure you provide us with enough information so that we can recreate the problem.

For general questions, please post on the GMT Community Forum.

Contributing

Contributions are welcome and appreciated. Please refer to the contributing guidelines for more details.

License

Copyright (c) 1991-2020 by the GMT Team.

GMT is released under the GNU Lesser General Public License version 3 or any later version. See LICENSE.TXT for full details.

Acknowledgment

GMT relies on several other Open Source software libraries and programs for its operation. We gratefully acknowledge the importance to GMT of these products. GMT may be linked with these libraries (* means optional): Network Common Data Form (netCDF), Geospatial Data Abstraction Library (GDAL*), Perl Compatible Regular Expressions (PCRE*), Fastest Fourier Transform in the West (FFTW*), Linear Algebra Package (LAPACK*), Basic Linear Algebra Subprograms (BLAS*), GLIB*, and ZLIB*. GMT may call these executables: GDAL (ogr2ogr, gdal_translate), Ghostscript, FFmpeg, xdg-open, and GraphicsMagick.

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