Hello lists, Sometime last year I was inspired by http://www.srtm.com and I even contacted developer to see if we can use SRTM derived relief maps in OSM. I don't remember all details but reply was somewhat ambiguous: yes OSM can use pre-rendered tiles from the site above, source code (in Java ) is a bit messy, cause my crazy mate coded something ... Anyway, while srtm.com tiles look good on its own, colour scheme is not suitable for overlaying with OSM data IMHO. So I thought it would be fairly straight forward to implement something from scratch.
Here is what I'm thinking about - a c++ command line app, which given bounding box in geographic coordinate system (WGS84) would read compressed raw SRTM files and output 'nice' looking maps (tiles) in specified projection (I only care about Mercator and OS NatGrid but others will work as well). Here is more detailed feature list: 1. highly configurable 2. all steps needed to produce final relief map included (relief, blending , warping etc) 3. read raw compressed SRTM directly 4. easy to add new algorithms 5. using GIL from Adobe for accessing pixels and implementing algos. 6. mapnik and OSM ready 7. perhaps it can be used for outputting contours as well (?) I've coded a prototype based on excellent posting on http:// perrygeo.net/wordpress/?p=7 and I'm looking for a good color scheme that would work for the whole planet, any pointers? Here is some test outputs: http://artem.dev.openstreetmap.org/files/relief_osgb.png http://artem.dev.openstreetmap.org/files/srtm_relief.png (red pixels are voids and I'm yet to fill them, did someone mentioned some good algorithms a few months ago?) The kind of reliefs I think might work well for OSM are gmap terrain or perhaps Yahoo style. Any ideas or comments? Cartographers? Thanks in advance Artem _______________________________________________ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk
