[Tilecache] google maps (900913) and tilecache with openlayers as the client

[Ivan Price]

Thanks to Josh Livni and Guillaume Sueur who both replied to me
off-list and pointed me to the fact that I had set the projection of
the layer(s) (as opposed to the map as a whole) to projection 4326 and
not 900913. The tms_type and spherical_mercator items in the tilecache
config are not neccessary/relevant.

So setting the projection of the layers in OL to be tilecached to
900913 (or removing the reference and letting OL give them the map
default) has got me working.

Thanks everyone !

-i

On 14/09/2008, Ivan Price <gunn.point at gmail.com> wrote:
> Hi there..
>
> I have an openlayers application overlaying some WMS layers (that i am
> serving locally from geoserver) over the top of google maps.
> Everything is running perfectly there using the " 'sphericalMercator':
> true" parameter in the googlemaps layers' config.
>
> What I am trying to do now is point openlayers at my tilecache instead
> of directly to geoserver for my local wms layers. I have previously
> got this working no worries when no google layers were involved.  I
> have read a lot of information about getting tilecache to work when
> using google maps as the client, but is it able to request tiles when
> openlayers is the client (and google is involved) ? I have aligned the
> 'resolutions' parameter between openlayers and tilecache, and used the
> tms_type and spherical_mercator tags in TC but still tilecache
> returns:
>
> An error occurred: Current x value 8004688.542400 is too far from tile
> corner x 7514065.626400
>
> So the problem is aligning openlayers with tilecache.. but i can't see
> what i'm missing. Is what i'm trying to do even possible ? Any
> comments or suggestions would be greatly appreciated.
>
> cheers,
>
> -ivan
>
>
> heres my tilecache config:
>
> [landsat]
> type=WMS
> url=http://localhost:8080/geoserver/wms
> extension=jpeg
> resolutions=156543.033900000,78271.516950000,39135.758475000,19567.879237500,9783.939618750,4891.969809375,2445.984904688,1222.992452344,611.496226172,305.748113086,152.874056543,76.437028271,38.218514136,19.109257068,9.554628534,4.777314267,2.388657133,1.194328567,0.59716428337097171575,0.298582142
> srs=EPSG:900913
> maxResolution=156543.0339
> bbox=-20037508.3427892,-20037508.3427892,20037508.3427892,20037508.3427892
> tms_type=google
> spherical_mercator=true
> layers=xxxxx
>
> openlayers layer config:
>
> 	map = new OpenLayers.Map('map', {
> 			controls: [],
> 			resolutions:
> [156543.033900000,78271.516950000,39135.758475000,19567.879237500,9783.939618750,4891.969809375,2445.984904688,1222.992452344,611.496226172,305.748113086,152.874056543,76.437028271,38.218514136,19.109257068,9.554628534,4.777314267,2.388657133,1.194328567,0.59716428337097171575,0.298582142],
> 			projection: new OpenLayers.Projection("EPSG:900913"),
> 			displayProjection: new OpenLayers.Projection("EPSG:4326"),
> 			units: "m",
> 			maxExtent: new OpenLayers.Bounds(-20037508.34, -20037508.34,
> 20037508.34, 20037508.34)
> 			numZoomLevels: 18,
> 			maxResolution: 156543.0339
> 	});
>
> (cut)
>
> 	var layer_image_landsat = new OpenLayers.Layer.WMS(
> 		"Local Imagery", "/tilecache/tilecache.cgi",
> 		{
> 		        layers: 'landsat',
>                         srs: 'EPSG:4326',
>                         format: 'image/png',
> 			transparent:true
> 		},
> 		{ isBaseLayer: true, singleTile: false, opacity:1}
>            );
>
> (cut)
>