Peter, Thanks for the helpful info! It's much appreciated (and I just realized I posted to OSM list instead of mapnik, helpful anyway!).
I'll look deeper into post-render distortion. Kind regards, Chris On Wed, Jul 17, 2013 at 8:40 AM, Peter Körner <osm-li...@mazdermind.de>wrote: > 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 > dev@openstreetmap.org > http://lists.openstreetmap.org/listinfo/dev > -- Christopher Stevens 303.929.7863 cell www.christopherstevens.cc
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