[Tilecache] Tilecache projection problem w/ Google Maps and Geoserver WMS

[jordanderson]

Hi all,

I'm able to get Tilecache up-and-running a WMS layer from Geoserver. It's
working great on its own. I'd also like to get it working with an existing
OpenLayers application I've built that includes a Google Maps layer and some
other vector layers. The OpenLayers map is EPSG:900913; the WMS layer is
EPSG:4623.

The integration of the two layers works fine if I'm not using Tilecache.
(For example, if I create the nycmap OpenLayers layer with gsServer using
the code below, it works fine.) When I use Tilecache -- using tcServer in
the code below -- Tilecache doesn't render any tiles. Not even pink tiles,
just empty PNGs.

I checked the access.log and the entries look like this:
"GET
/tilecache/tilecache.py?LAYERS=nycmap&TILED=true&FORMAT=image%2Fpng8&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&STYLES=&EXCEPTIONS=application%2Fvnd.ogc.se_inimage&SRS=EPSG%3A900913&BBOX=-8208725.000931252,4951096.705981249,-8198941.061312502,4960880.6455999985&WIDTH=256&HEIGHT=256
HTTP/1.1"

Note that the SRS it requested was EPSG:900913 and the bbox reflects that
SRS. That seems to be the problem...

If I set tcServer =
"http://myserver.com/tilecache/tilecache.py?EPSG%3A4623", I can force it to
use the correct SRS, but the BBOX still reflects EPSG:900913.

I'm sure there's one little thing I'm missing, so please let me know if you
notice anything I'm obviously doing wrong. Thanks!

Jordan 

-----------------

OpenLayers code:

var options = {
  maxExtent: new OpenLayers.Bounds(-20037508,-136554022,20037508,136554022),
  maxResolution: 156543.0339,
  projection: "EPSG:900913",
  units: "m",
  controls: [],
  numZoomLevels: 18
};

map = new OpenLayers.Map('mapDiv', options);

var gmap = new OpenLayers.Layer.Google(
  "Google street map",
  {'sphericalMercator': true, 'minZoomLevel': 11, 'numZoomLevels': 7}
);

var tcServer = "http://myserver.com/tilecache/tilecache.py?"; // This
doesn't work...
var gsServer =  "http://myserver.com:8080/geoserver/wms"; // This does
work...

var nycmap = new OpenLayers.Layer.WMS(
  "NYC Map",
  tcServer,
  {layers: 'nycmap', tiled: 'true', format: 'image/png8'}
);

map.addLayers([gmap, nycmap]);

Tilecache configuration:

[nycmap]
type=WMSLayer
layers=nycmap
url=http://myserver.com:8080/geoserver/wms?
mime_type=image/png8
extension=png
srs=EPSG:4623
bbox=-180.0,-90.0,180.0,90.0
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