June 2005
Intermediate to advanced
568 pages
24h 7m
English
Content preview from Mapping Hacks
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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.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.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.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.
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Chapter 3, Mapping Your World
#28 Experiment with Different Cartographic Projections
HACK
distance equals half a degree of longitude, but, looked at another way, it’s
only a 0.35% difference in measuring a line that stretches halfway across the
world. Using the mean of the semimajor and semiminor radii mitigates the
potential for error somewhat, but, obviously, the amount of time you spend
considering this issue should bear some relation to the actual degree of accu-
racy you’re after.
See Also
• “Plot a Great Circle on a Flat Map” [Hack #30]
• “Work with Different Coordinate Systems” [Hack #26]
• Sinnott, R.W. “Virtues of the Haversine.” Sky and Telescope, Vol. 68,
No. 2, 1984, p. 159.
• See http://mappinghacks.com/projects/distance/ for a discussion of differ-
ent ways to simplify distance calculations.
HACK
#28
Experiment with Different Cartographic
Projections Hack #28
There are lots of ways to depict a round planet on a flat plane, but,
fortunately, there are also versatile tools for exploring the aesthetic
compromises embodied in different cartographic projections.
One of the main challenges of mapping our world is how to represent its
round surface on the flat plane of a map. Most projections involve some pro-
cess of projecting Earth’s spheroid surface directly onto a flat plane, or onto
the surface of another figure which can be “unwrapped” into a flat plane
without warping or tearing, such ...
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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.