I am trying to create a google earth like wep application. My problem is that I can't get to render a full view of the earth.
The zoom_all() function generates the following error :
RuntimeError: could not zoom to combined layer extents using zoom_all because proj4 could not back project any layer extents into the map srs (set map 'maximum-extent' to override layer extents) And if I define an envelope, I can only manage to have a cropped view of the earth with
mapnik.Envelope(-4500000, -4500000, 4500000, 4500000) or a blank image with
mapnik.Envelope(-4600000, -4600000, 4600000, 4600000) EDIT : I also tried specifying maximum-extent in the xml file but the result was the same as specifying the envelope in the python script.
What am I doing wrong ? Any hint will be appreciated :)
My configuration is :
- WGS84 shapefile coastlines-split-4326.zip (http://openstreetmapdata.com/data/coastlines)
- mapnik 2.2.0-pre
- archlinux
This is the python script that renders the image :
#!/usr/bin/python2 import mapnik image = 'world-xml.png' map_config = 'world.xml' m = mapnik.Map(1000, 1000) mapnik.load_map(m, map_config) bbox = mapnik.Envelope(-4500000, -4500000, 4500000, 4500000) m.zoom_to_box(bbox) mapnik.render_to_file(m, image) And this is the xml config file :
<Map background-color="#ffffff" srs="+proj=ortho +lat_0=0 +lon_0=0 +ellps=WGS84 +units=m +x_0=0 +y_0=0 +no_defs"> <Style name="projet-carte"> <Rule> <PolygonSymbolizer fill="#ffffff" /> <LineSymbolizer stroke="#000000" stroke-width="0.1" /> </Rule> </Style> <Layer name="world" srs="+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs"> <StyleName>projet-carte</StyleName> <Datasource> <Parameter name="type">shape</Parameter> <Parameter name="file">lines.shp</Parameter> </Datasource> </Layer> </Map> 
