Hey Andy, Thanks for the help. That was sound advice, working backwards from generate_image.py and the osm.xml was quick and easy. Definitely a good approach.
I think the two problems I had were that the datasource is spherical mercator so I changed the srs of the layer but also I think that I needed to use the m.zoom_to_box(bbox)function in the code, otherwise I'm guessing it tries to render a whole world view so my little insignificant streets in London wouldn't even register at pixel level :) Works a charm now it seems. Thanks Andy! Colm On Wed, Jan 13, 2010 at 13:57, Andy Allan <[email protected]> wrote: > On Wed, Jan 13, 2010 at 1:12 PM, Colm McMullan <[email protected]> > wrote: > > > <Map bgcolor="#ffffff" srs="+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 > > +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgri...@null +no_defs -tl > -r"> > > <Style name="line style 2"> > > <Rule> > > <LineSymbolizer> > > <CssParameter > name="stroke">#000000</CssParameter> > > <CssParameter > name="stroke-width">3.0</CssParameter> > > </LineSymbolizer> > > </Rule> > > </Style> > > <Layer name="layer 4" srs="+proj=latlong +ellps=WGS84 +datum=WGS84 > > +no_defs" status="on"> > > <StyleName>line style 2</StyleName> > > <Datasource> > > <Parameter name="type">postgis</Parameter> > > <Parameter name="host">localhost</Parameter> > > <Parameter name="user">postgres</Parameter> > > <Parameter name="dbname">gis</Parameter> > > <Parameter name="estimate_extent">true</Parameter> > > <Parameter name="table">planet_osm_roads</Parameter> > > </Datasource> > > </Layer> > > </Map> > > > > > So I'm a bit stumped, what am I missing? Has anyone got any suggestions? > > My rule of thumb with Mapnik is "it's always a projection problem". > Are you sure that your db is in latlong? By default osm2pgsql is in > spherical mercator. > > If that's not it, I'd suggest starting with the generate_image.py and > the osm.xml from OSM SVN, and get that working with all the defaults > as described on the wiki. You can then step through changes one at a > time (e.g. changing your db to latlong instead of spherical mercator, > using your own style instead of osm.xml and so on. > > Cheers, > Andy >
_______________________________________________ dev mailing list [email protected] http://lists.openstreetmap.org/listinfo/dev
