Hi List,
I have a map that I thought was all correctly set up to use spherical mercator,
and all my data (which is all projected in 900913) is correctly displaying on
either open streetmap or google streets data. However, when I add a google
satellite or hybrid layer, the initial load of the map shows the satellite
layer displaced several hundred miles to the west. If I switch to the google
streets layer without any zooming or panning, the displacement disappears. If I
then switch back to the google satellite layer, again with no zooming or
panning, it appears in the correct place. Throughout all of this, my data layer
has no displacement. Furthermore, since all of this is set within mapfish, with
extjs used for side panels, if I minimise the side panel while the displacement
is occurring it also removes the displacement. I'm using the svn versions of
openlayers and mapfish.
This is the code relating to setting up the map and layers:
function createMap() {
var options = {
projection: new OpenLayers.Projection("EPSG:900913"),
displayProjection: new OpenLayers.Projection("EPSG:27700"),
units: "m",
maxResolution: 156543.0339,
maxExtent: new OpenLayers.Bounds(-20037508.34, -20037508.34,
20037508.34, 20037508.34)
};
return new OpenLayers.Map('olmap',options);
} //end createmap
function addlayers(map){
// define wms
layer = new OpenLayers.Layer.WMS("OA Sites WMS",
"http://geoserver.thehumanjourney.net:80/geoserver/wms?";,
{layers: 'oadigi:oasites', transparent: true,
format: 'image/png', buffer:0},
{isBaseLayer: false});
// create Google Mercator layers
var gmap = new OpenLayers.Layer.Google(
"Google Streets",
{'sphericalMercator': true}
);
var gsat = new OpenLayers.Layer.Google(
"Google Satellite",
{type: G_SATELLITE_MAP, 'sphericalMercator': true,
numZoomLevels: 22}
);
var ghyb = new OpenLayers.Layer.Google(
"Google Hybrid",
{type: G_HYBRID_MAP, 'sphericalMercator': true}
);
// define pseudo-layer for highlighting selected features
select = new OpenLayers.Layer.Vector("Selection",
{protocol: new mapfish.Protocol.TriggerEventDecorator(protocol),
strategies: [new mapfish.Strategy.ProtocolListener({append:
true})],
styleMap: new
OpenLayers.Style(OpenLayers.Feature.Vector.style["select"]),
displayInLayerSwitcher: false});
// add layers
map.addLayers([layer, select, gmap, gsat, ghyb]);
} //end addlayers
function setMapCenter() {
//define a new projection object so map can be centred using latlong
var proj = new OpenLayers.Projection("EPSG:4326");
var point = new OpenLayers.LonLat(-2.9, 53.6);
this.setCenter(point.transform(proj, this.getProjectionObject()), 6);
} //end setMapCenter
I hope that's enough information for someone as it's hard for me to get this
map accessible to the outside world yet.
Many thanks
Jo
--
-----------------------------------------------------
Joanne Cook
Senior IT Support and Development
Oxford Archaeology (North)
01524 880212
http://thehumanjourney.net
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