[OSM-dev] Plotting data on an equirectangular map, distorted for sphere projection

Christopher Stevens chris at christopherstevens.cc
Wed Jul 17 13:41:21 UTC 2013


Hello gurus,
I'm thinking that I may need to find some alternative data visualization
software to make this work, but I love mapnik and thought it would be good
to start here first.

I'm hoping to create a basic themed map of different types of data and plot
it on a full-Earth image (I can figure this part out, starter examples
cover this as well). The challenge is that I'm then projecting this on Science
On a Sphere<http://www.spacefoundation.org/visit/northrop-grumman-science-center-featuring-science-sphere/science-sphere%C2%AE>,
which requires equirectangular images that distort more towards the poles.
Here's a quick example of something I made in a 3D program to show latitude
and longitude lines (note how the lines and labels get fuzzy and stretched
near the poles).

http://www.flickr.com/photos/8139783@N08/9305646391/

Is there a way to add this type of distortion in mapnik? I'm guessing not
as mapnik is optimized for other uses (but who knows). I'm guessing that it
would "work" as is, but labels would get distorted (there are
work-arounds), and lines would get very thin near the poles.

Thanks for the feedback in advance. Let me know if I can answer any
questions.

Best regards,

Chris
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