I connect Geowebcache to a remote WMS service through their Getcapability request by adding the url in geowebcache-servlet.xml document. Geowebcache demo page displays the list of wms layers from the remote wms server. When I click on the png link for the EPSG:900913 format , to display the map, only displays the image place holders instead of map tiles. This displays map for the png link for EPSG:4326 formaT. When I issue a Getmap request to the remote wms service directly from my browser, for EPSG:4326 works well but for EPSG:900913 it shows error “SRS Code 'EPSG:900913' is not supported (not found in SRS xml settings)”. When I check their Getcapability document I could not find EPSG:900913 in the SRS list, but EPSG:4326 is available. Since I want display the map in google map api v2 , think i need EPSG900913 format to get this work. I think geowebcache generate an automatic re-projection in EPSG:900913 format for googlemap api. This link is not working for me, I think that could be the reason this is not displying in google map api.
could someone tell me a solution for this ? why the reprojection not working ?
Here is the link for EPSG:4326 format , this will start disply at a scale 1:272K range 10th zoom
This is the link for EPSG:900913 format which is not working for me.
This is the link for the Geowebcache demo page
I think there is a way to define independent layers and projections in geowebcache.xml document. Not sure how to do this to suit for my situation ?
Best Answer
GWC doesn't do reprojection, so you need to download GeoServer 2.1 and set up your remote WMS as a cascading WMS, GeoServer will then reproject your remote WMS from 4326 to what ever projection you need. Then use the built in GWC to serve out tiles from the cascaded layer.
This blog post http://geo-solutions.blogspot.com/2010/10/wms-cascading-in-latest-geoserver.html describes how to set up your remote WMS. After that it behaves exactly as if you have a local layer.