Hi Martin I tried that but it still had a memory errory.
In my map xml i pointed to the VRT and then in my python I had the following #!/usr/bin/env python import mapnik mapfile = 'map.xml' map_output = 'map.tif' m = mapnik.Map(132000, 248000) mapnik.load_map(m, mapfile) bbox = mapnik.Box2d(mapnik.Coord(0, 0), mapnik.Coord(700000, 1300000)) m.zoom_to_box(bbox) mapnik.render_to_file(m, map_output) Should I be changing the map size or the box? thanks On 21 February 2012 15:42, Martin Koppenhoefer <[email protected]>wrote: > Am 21. Februar 2012 16:07 schrieb tim martin <[email protected]>: > > Hi > > > > I have been recommended to use Mapnik to combine two geotiffs, one > > topogrpahic and one hillshade. > > > > I have managed to do this using an XML mapfile and a short python script, > > just like in the tutorials. > > > > However, I need to create a geotiff output of 132000 by 248000 pixels, > even > > going above 6000 by 6000 i get an out of memory error. > > > > So the other way I think I could do it is run the geotiff+hillshade on > the > > smaller original geotiffs which are 4000 by 4000 each. > > > > However there are 2000 of them so how can I program mapnik to step > through > > each one rather than write 2000 entries in my map.xml file > > > have a look at vrt (virtual raster tables) from GDAL. > > cheers, > Martin >
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