On Wednesday 02 Jan 2008 22:31, Andy Allan wrote: > On Jan 2, 2008 9:55 PM, Artem Pavlenko <[EMAIL PROTECTED]> wrote: > > 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? > > WANT. > > :-) > > I'd like on the cycle map to show relief at low zoom, and something > approaching the "Color ramps" from that linked blog post at high zoom > (relief is generally impossible to make out when you get zoomed in too > far). The thing I've been wanting and getting nowhere towards is both > of those concepts with contours too (for a bit of precision), so if > this tool of yours can do contours, relief and colour ramps then I > could fiddle with the colours till the cows come home. Which is all I > want to do really, since I've pretty much sucked at getting contours > done myself* > > Cheers, > Andy
Hello Andy, There is the srtm2shp utility available in SVN which outputs a shapefile of contours, it outputs in Mercator - is that any good? It doesn't deal with SRTM voids yet. Nick _______________________________________________ dev mailing list [email protected] http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/dev
