June 2005
Intermediate to advanced
568 pages
24h 7m
English
Content preview from Mapping Hacks
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Plot Arbitrary Points on a World Map #29
Chapter 3, Mapping Your World
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135
HACK
offs in size and shape on world maps. In this example, we’ll plot the cities
with .25 cm wide red stars and center the map at 10ºE, in order to avoid
splitting Siberia. We’ll leave further exploration of the following GMT com-
mands as an exercise for the gentle reader, but you can see the map they
produce in Figure 3-28:
$ pscoast -JN10/18c -R-170/190/-90/90 -G64/255/128 -S64/128/255 -A5000 -K > \
cities.ps
$ psxy cities.txt -JN10/18c -R-170/190/-90/90 -Bg30/g15 -Sa.25c -G255/0/0 -O \
>> cities.ps
See Also
• “Work with Different Coordinate Systems” [Hack #26]
• “Plot Arbitrary Points on a World Map” [Hack #29]
• “Digging to China” [Hack #22]
• “Plot Dymaxion Maps in Perl” [Hack #31]
• Generic Mapping Tools home page (http://gmt.soest.hawaii.edu/)
• Online Map Creation site (http://www.aquarius.geomar.de/omc/)
HACK
#29
Plot Arbitrary Points on a World Map Hack #29
Of the dozens of common cartographic projections used to depict the entire
world, the Equidistant Cylindrical projection—also known as the rectangular
projection—is by far the most hackable, making it easy to plot points
wherever you want.
Since our lovely world is round but our maps are not, the would-be map
hacker has a choice to make when selecting a cartographic projection for a
given map. The range of available choices are described in detail in
Figure 3-28. The ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.