On Thursday 03 Jan 2008 08:53, you wrote: > On Jan 2, 2008 11:50 PM, Nick Whitelegg <[EMAIL PROTECTED]> wrote: > > 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. > > I had seen that when you posted about it recently. I haven't tried it > out yet, but I have more confidence in the usefulness of your scripts > than of mine, but I couldn't get the older version of your scripts to > work for me. > > One of the things I haven't worked out yet is how to render > planet-wide contours in an efficient manner, since the shapefiles > mulitply either in size or number to rather large amounts (for 10m > contours especially) as I start including europe, never mind in the > US. I found there were more than 4GB of contours for the UK, which > made it impossible to combine the results for each SRTM->shp > conversion into one large shp file. > > Cheers, > Andy
The srtm2shp actually generates one big shapefile, it does it by tiles (by default 0.1 x 0.1 latlon or 10000x10000 mercator units) and then merges each shapefile together. It takes a fair while to do the whole of the UK (a few hours IIRC) but the resulting shapefile, when indexed using Artem's shapeindex utility, is manageable to use - I currently use one big UK shapefile on Freemap, it's a little on the slow side in mountainous areas (i.e. Lake District, Snowdonia, Scottish Highlands) but not too bad. Nick _______________________________________________ dev mailing list dev@openstreetmap.org http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/dev
