June 2005
Intermediate to advanced
568 pages
24h 7m
English
Content preview from Mapping Hacks
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Chapter 3, Mapping Your World
#28 Experiment with Different Cartographic Projections
HACK
Because of its origins in scientific publishing, GMT’s primary output format
is PostScript, which is great if you plan to make hardcopies of your maps—
because, as a vector format, PostScript can be scaled to any size—but a little
unwieldy otherwise. Ghostview (a.k.a. gv) is the ideal way to view Post-
Script on Linux, and GSview is a solid, free PostScript viewer for Windows
and OS X. You can find out more about these viewers at http://www.cs.wisc.
edu/~ghost/. You should also be able to load and edit PostScript in most
modern image editors, including the GIMP, in order to export your maps to
other formats, like PNG or JPEG.
If you want to jump right in and start making these maps on
your own, without first installing GMT, try visiting the Online
Map Creation site at http://www.aquarius.geomar.de/omc/.
There, you’ll find a very nice, simplified web-based frontend
to GMT, which will allow you to experiment with some sim-
ple projections, and probably whet your appetite to do more!
Cylindrical Projections
Frequently used cylindrical projections include Mercator, Transverse Merca-
tor, and Peters projections.
The Mercator projection. The one projection that nearly everyone is familiar
with, the Mercator, is a classic example of a cylindrical projection, which
maps the surface of the planet onto that of a cylinder, ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.