[MapProxy] Spherical Mercator Projection

Oliver Tonnhofer tonnhofer at omniscale.de
Wed Aug 1 08:59:38 PDT 2012

On 01.08.2012, at 09:02, Frank Broniewski wrote:
> I have trouble overlaying my own data from a Mapnik source with OpenStreetMap tiles. I need/want to use the official EPSG 3857 instead of 900913 for my data [1]. From here [2] I read that 3857 is just an alias to 900913, so the data should overlay cleanly. But unfortunately I have a shift between my data and the OSM tiles.
> So how do I need to configure my grids so that they overlay nicely with the OSM tiles? 

You can't use the TMS service when you want to overlay the tile with OpenStreetMap since OSM doesn't offer a real TMS. See http://mapproxy.org/docs/nightly/services.html#openlayers and http://mapproxy.org/docs/nightly/services.html#google-maps

> and other variations. I also have the problem that the map center is jumping around when zooming in. That means when you zoom in, on a city for example, that after the zooming process the city is shifted onto another position than the zoom position. I am uncertain if this is a Mapproxy misconfiguration or if it is on the OpenLayers side, but I used the same configuration options on both sides. I still wonder if the coverages I use are a cause for this. If only the rendering times would be faster testing wouldn't be such a pain ..

Maybe you still have cached tiles that where created with a different grid?


Oliver Tonnhofer    | Omniscale GmbH & Co KG    | http://omniscale.de
http://mapproxy.org | https://github.com/olt | @oltonn

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