Hello,
I am using GeoWebCache(GWC) as part of a GeoServer installation. I have a
layer that consists of parcels (polygon)... I cannot get GWC layer/tiles
(EPSG:4326) to align correctly with the parcels from the Geoserver WMS
service or Bing Maps etc. -- It seems that the parcels served from GWC
shift to the north and west by several feet. I am able to get WMS service
from GeoServer to align correctly with other serices that are projected in
EPSG:4326 (e.g. Bing ) but not GWC. No matter what I do, it seems that
layers/tile served from GWC shifts .. My parcels are projected as EPSG:3424
on the GeoServer.
Here are some code snippets...
var map, formats, event_xy;
var wfsurl = "http://noah:8080/geoserver/wfs";;
var url = "http://noah:8080/geoserver/wms";;
var cacheurl = "http://noah:8080/geoserver/gwc/service/wms";; // cached url
vvar bounds = new OpenLayers.Bounds(
-74.553, 40.037,
-74.438, 40.129
);
var options = {
//controls: [],
maxExtent: bounds,
maxResolution: 0.00044921875,
resolutions: [0.703125, 0.3515625, 0.17578125,
0.087890625, 0.0439453125, 0.02197265625, 0.010986328125, 0.0054931640625,
0.00274658203125, 0.001373291015625, 6.866455078125E-4, 3.4332275390625E-4,
1.71661376953125E-4, 8.58306884765625E-5, 4.291534423828125E-5,
2.1457672119140625E-5, 1.0728836059570312E-5, 5.364418029785156E-6,
2.682209014892578E-6, 1.341104507446289E-6, 6.705522537231445E-7,
3.3527612686157227E-7],
projection: "EPSG:4326",
units: "degrees"
};
map = new OpenLayers.Map(options);
var road = new OpenLayers.Layer.Bing({
key: apiKey,
type: "Road"
//metadataParams: {mapVersion: "v1"}
});
var aerial = new OpenLayers.Layer.Bing({
key: apiKey,
type: "Aerial"
});
var hybrid = new OpenLayers.Layer.Bing({
key: apiKey,
type: "AerialWithLabels",
name: "Bing Aerial With Labels"
});
var parcel = new OpenLayers.Layer.WMS(
"Parcels", cacheurl,
{
LAYERS: 'xxx:parcel',
STYLES: '',
format: format,
tiled: true,
transparent: true,
tilesOrigin : map.maxExtent.left + ',' + map.maxExtent.bottom
},
{
buffer: 0,
displayOutsideMaxExtent: true,
isBaseLayer: false,
visibility: false
}
);
var rparcel = new OpenLayers.Layer.WMS(
"Raw:Parcels", url,
{
LAYERS: 'xxx:parcel',
STYLES: '',
format: format,
tiled: true,
transparent: true,
tilesOrigin : map.maxExtent.left + ',' + map.maxExtent.bottom
},
{
buffer: 0,
displayOutsideMaxExtent: true,
isBaseLayer: false,
visibility: false
}
);
map.addLayers([road, aerial, hybrid, rparcel, parcel]);
Any Ideas? Also, how can I find where GeoServer and GeoWebCache keeps the
definitions for EPSG:4326 --I would like to check the datum...
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