Hi Am 17.07.2013 15:41, schrieb Christopher Stevens: > 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. Mapnik is capable of rendering data in nearly any possible projection - and it can be done with osm-data, too.
On http://polar.openstreetmap.de/ we do a rendering in EPSG:3031 Antarctic Polar Stereographic projection. Code and documentaztion can be found here: https://github.com/MaZderMind/mapnik-stylesheets-polar However those projections are applied to the geometries *before* rendering out a planar, rectangular image. > 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/ This however looks like an post-render distortion, so I'd guess you'd have to apply some filter to the rendered mapnik images. > 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. I'd bet that it would be better to use sth. like graphicsmagick or a custom program with libpng to do the pixel-transformations after the rendering finished. Peter _______________________________________________ dev mailing list [email protected] http://lists.openstreetmap.org/listinfo/dev
