Janes, Glad it is working!
Note that you can pass a '--bbox' flag to nik2img that expects bounds in lat/long (and will transform them internally to your map srs). Dane On Sep 15, 2010, at 8:43 PM, Janes Huff wrote: > Thank you, Dana! > Don't know wether to laugh or to cry now. <328.png> At least a silly fault of > mine. Now it works. > > CC or Janes > > 2010/9/15 Dane Springmeyer <[email protected]> > > On Sep 15, 2010, at 4:55 PM, Janes Huff wrote: > >> Hi, >> I tried some tests with mapnik using osm data (download brandenburg.osm from >> Geofabrik; cut out a smaller region with osm2pgsql: osm2pgsql --bbox >> 12.6247,52.2599,13.3848,52.5194 -m -d gis brandenburg.osm). All parts >> (postgis, mapnik, ...) seem to work fine. >> >> I created the two files: >> >> a) werder.py (origin code I took from here: >> http://trac.mapnik.org/wiki/XMLGettingStarted): >> >> #!/usr/bin/env python >> # -*- coding: utf-8 -*- >> import mapnik >> mapfile = 'werder.xml' >> map_output = 'werder.png' >> m = mapnik.Map(800, 600) >> mapnik.load_map(m, mapfile) >> bbox = mapnik.Envelope(mapnik.Coord(12.6247,52.2599), >> mapnik.Coord(13.3848,52.5194)) >> m.zoom_to_box(bbox) >> mapnik.render_to_file(m, map_output) >> > Your Map is in mercator so you need to pass mercator coordinates to the > zoom_to_box function. > > Here is an example of reprojecting long/lat coords into spherical mercator: > > http://mapnik-utils.googlecode.com/svn/example_code/google_mercator_projection/world_mercator.py > > You can also just render the werder.xml with nik2img.py which will > automatically zoom to the extents of your data (if set correctly, see below). > >> >> >> b) werder.xml: >> <?xml version="1.0" encoding="utf-8"?> >> <!DOCTYPE Map> >> <Map bgcolor="#ffffff" srs="+proj=merc +lon_0=0 +k=1 +x_0=0 +y_0=0 >> +ellps=WGS84 +datum=WGS84 +units=m +no_defs"> > >> [...snip...] > >> >> <Layer name="strassen" status="on" srs="+proj=merc +lon_0=0 +k=1 +x_0=0 >> +y_0=0 +ellps=WGS84 +datum=WGS84 +units=m +no_defs"> >> <StyleName>strassen</StyleName> >> <Datasource> >> <Parameter name="type">postgis</Parameter> >> <Parameter name="password">my-very-secret-pw</Parameter> >> <Parameter name="host">localhost</Parameter> >> <Parameter name="port">5432</Parameter> >> <Parameter name="user">postgres</Parameter> >> <Parameter name="dbname">gis</Parameter> >> <Parameter name="table">planet_osm_line</Parameter> >> <Parameter name="estimate_extent">false</Parameter> >> <Parameter name="extent">12.6247,52.2599,13.3848,52.5194</Parameter> >> </Datasource> >> </Layer> >> </Map> >> > > Your layer is going to be in spherical mercator () as it was imported with > the -m flag of osm2pgsql, so that means your extent value must also be in > spherical mercator coordinates (not long/lat). An easy solution here is to > let PostGIS calculate the layer's extents automatically (just remove the > 'extent parameter' to trigger this). > > > >> After execution I get no error message and the PNG-file I waited for. Well, >> but it's blank - sorry - it's background color is #fffff (or whatever color >> I setted). But no map features are shown. >> I searched a lot by now, but couldn't figure out the mistake. Could you give >> me a hint, please? >> >> >> Thank you, >> CC >> >> >> >> P.S.: >> >> OS: Kubuntu 10.4 >> Mapnik: 0.7 >> Postgresql: 8.4 >> >> Postgis: 1.5.1 >> osm2pgsql: 0.66.20090526 >> _______________________________________________ >> Mapnik-users mailing list >> [email protected] >> https://lists.berlios.de/mailman/listinfo/mapnik-users > >
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