[Tilecache] mapnik + tilecache + openlayers

[Christopher Schmidt]

On Tue, May 19, 2009 at 11:14:07AM -0700, kryptonite wrote:
> 
> Well sorry I got you all confused. Well, I was able to run the sample from
> http://trac.mapnik.org/wiki/XMLGettingStarted like you had mentioned
> earlier. I got the script to run, have the xml and got the png files too.
> Now the part where I am stuck basically is having to show the map using
> openlayers. The tiles are just pink and there are no tiles in the cache
> whose path in my case is C:\tmp\tilecache. The layer folder which I
> indicated is the folder that should be created in the cache- it holds all
> the tiles - , the name of the folder being the layer specified in the
> tilecache.cfg file. 

http://trac.openlayers.org/wiki/TroubleshootingTips#Pinktiles

Also, your tilecache config, if you haven't included it, and probably
your map and layer config in the OL javascript, though that shouldn't be
neccesary.

-- Chris
> 
> 
> 
> Dane Springmeyer wrote:
> > 
> > 
> > On May 18, 2009, at 1:02 PM, kryptonite wrote:
> > 
> >>
> >> Hi,
> >>   I have been trying for the past few days to get a simple map to  
> >> display
> >> with mapnik+tilecache+openlayers. I have installed mapnik , and got  
> >> the
> >> default rundemo.py running , map.xml being one that was generated.  
> >> the image
> >> files were generated too like the documentation on mapnik says.
> > 
> > Great, keep in mind however that those shapefiles that come with the  
> > 'rundemo.py' are in a fairly unique lambert projection. It may be  
> > easier to try to start with the XML from
> > http://trac.mapnik.org/wiki/XMLGettingStarted 
> >   that works with a world borders shapefile in EPSG 4326.
> > 
> > 
> >> I have also
> >> successfully displayed a map using openlayers and tilecache but this  
> >> time
> >> was with mapserver.
> >>   But coming to the main problem which is using
> >> tilecache+openlayers+mapnik. Now all i did in the tilecache.cfg was  
> >> include
> >> a layer like this:
> >>
> >> [testlayer]
> >> type=Mapnik
> >> mapfile=C:\mapnik_0_6_0\demo\python\map.xml
> >> bbox=-8024477.28459,5445190.38849,-7381388.20071,5662941.44855
> >> maxResolution=2545.4906698
> >> extent_type=loose
> >> srs=EPSG:900913
> >>
> > 
> > One problem here is that the TileCache Mapnik layer does not respect  
> > the 'srs' parameter. We need to add this support in the future. In the  
> > meantime you need to specify the projection with the 'projection'  
> > parameter and the epsg 900913 proj4 literal as the value:
> > 
> > [test]
> > type=Mapnik
> > mapfile=/path/to/mapfile.xml
> > projection= +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 +nadgrids=@null +no_defs +over
> > # bbox for global extent of epsg 900913
> > bbox=-20037508.34, -20037508.34, 20037508.34, 20037508.34
> > 
> > Also, how are you coming up with the maxRes and bbox?
> > 
> > Dane
> > 
> > 
> > _______________________________________________
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> > Tilecache at openlayers.org
> > http://openlayers.org/mailman/listinfo/tilecache
> > 
> > 
> 
> -- 
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> 
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-- 
Christopher Schmidt
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