Revision 128896225 of "File:Chennai.png" on enwikiThis map was generated using all open-source software on an open-source unix operating system. The map itself and the marking of the co-ordinates were done using [http://gmt.soest.hawaii.edu GMT] software, and conversion to png format was done using [http://www.imagemagick.org ImageMagick][sic].
Please notice this is different form using graphics arts software tools to create maps or other pictures. In fact, this map was created by issuing only 3 command lines from a unix shell, without even using any GUI -- and GUI was used only to view the final picture before uploading it.
'''GMT''' is a geographic and cartographic set of tools, with extensive capabilities and options.
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