I have an application with a map-client using OpenLayers. I want to use Mapnik-data as background-layer, as provided with the class OpenLayers.Layer.OSM.Mapnik. For that I have to switch to the projection EPSG:900913. But I also want to display some layers, that I can only request in EPSG:4326. Can I combine both layers with the different projections in one map with OpenLayers and how can I do that?
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A:
If your layers are vector (WFS, KML, GeoRSS etc.) then you can reproject them with OpenLayers in the browser.
http://docs.openlayers.org/library/spherical_mercator.html#working-with-projected-coordinates
If your layers are raster (images / WMS services etc.) then they cannot be reprojected:
http://docs.openlayers.org/library/spherical_mercator.html#creating-spherical-mercator-raster-images
You'd have to do this via the WMS service itself (through MapServer / ArcGIS / GeoServer).
geographika
2010-02-08 20:49:33