[OpenLayers-Users] Problem when switching WMS layers on and off with Google Base Layer

[Christopher Schmidt]

On Thu, Jan 29, 2009 at 04:18:34PM -0500, Robert Hicks wrote:
> Hello all,
> I am having an issue when I have some WMS Layers over top of a Google base
> map. Basically what happens is when I toggle to layers on and off in the
> layer switcher the next time the layer appears it is shifted down relative
> to the Google map. It does not do this with the basic OpenLayers base map
> from http://labs.metacarta.com/wms/vmap0.

Use spherical mercator.

http://docs.openlayers.org/library/spherical_mercator
http://openlayers.org/dev/examples/spherical-mercator.html

-- Chris

> Here are my layer definitions:
> 
> var parcels = new OpenLayers.Layer.WMS(
>                 "Parcels", geoserverDomain,
>                 {
>                     //width: '800',
>                     srs: 'EPSG:4326',
>                     layers: 'mylayer_parcels',
>                     //height: '341',
>                     styles: '',
>      format: 'image/png',
>      transparent: 'true',
>      attribution: "A  Service"
>                 }
>             );
>             var munic = new OpenLayers.Layer.WMS(
>                 "Municipality", geoserverDomain,
>                 {
>                     //width: '800',
>                     srs: 'EPSG:4326',
>                     layers: 'mylayer_munic',
>                     //height: '341',
>                     styles: '',
>                     format: 'image/png',
>      transparent: 'true',
>      attribution: "A  Service"
>                 }
>             );
>             var roadcenterlines = new OpenLayers.Layer.WMS(
>                 "Road Center Lines", geoserverDomain,
>                 {
>                     //width: '800',
>                     srs: 'EPSG:4326',
>                     layers: 'mylayer_roadcenterlines_ft',
>                     //height: '341',
>                     styles: '',
>                     format: 'image/png',
>      transparent: 'true',
>      attribution: "A  Service"
>                 }
>             );
>             var raster = new OpenLayers.Layer.WMS(
>                 "Defiance County Raster", geoserverDomain,
>                 {
>                     //width: '800',
>                     srs: 'EPSG:4326',
>                     layers: 'gv:county',
>                     //height: '341',
>                     styles: '',
>                     format: 'image/png',
>      transparent: 'true',
>      attribution: "A  Service"
>                 }
>             );
>             var vector = new OpenLayers.Layer.Vector(
>        "GlobalView",
>              {
>              attribution:"A  Service",
>              displayInLayerSwitcher: false
>              }
>             );
>             map.addLayers([wms, raster, parcels, munic, roadcenterlines,
> vector]);
>             // setup controls and initial zooms
>             map.addControl(new OpenLayers.Control.PanZoomBar());
>             map.addControl(new OpenLayers.Control.Navigation());
>             map.addControl(new OpenLayers.Control.Scale($('scale')));
>     map.addControl(new OpenLayers.Control.MousePosition({element:
> $('location')}));
>             map.addControl(new OpenLayers.Control.LayerSwitcher());
>             map.addControl(new OpenLayers.Control.Attribution());
>             map.setCenter(new
> OpenLayers.LonLat(-84.52,41.35),11,false,false);
> 
> Has anyone encountered this?

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-- 
Christopher Schmidt
MetaCarta