Chris, It would be helpful to explain what you've tried already. Mapnik supports proj4 and proj4 understands quite a few projections. I'm no expert in equirectangular projections but https://en.wikipedia.org/wiki/Equirectangular_projection states that this is basically a term for the well know set of lon/lat based geographic coordinate systems.
So, can you try simply changing your Mapnik Map `srs` value to EPSG:4326 or a specific Equidistant cylindrical projection like http://spatialreference.org/ref/epsg/3786/ The specific Mapnik Map XML syntax can be found by following the link for "Mapnik XML" like: http://spatialreference.org/ref/epsg/3786/mapnik/ Dane On Jul 17, 2013, at 9:41 AM, Christopher Stevens <ch...@christopherstevens.cc> wrote: > 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, 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 > _______________________________________________ > dev mailing list > dev@openstreetmap.org > http://lists.openstreetmap.org/listinfo/dev
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