On 2 Jan 2008, at 23:50, Nick Whitelegg wrote: > 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. >
Yes, srtm2shp is what I was thinking of using. > Nick Artem _______________________________________________ dev mailing list [email protected] http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/dev
