[OpenLayers-Users] displacement of google satellite data
compared to google streetmap
joncoign
jncoign at Knology.net
Tue May 5 15:20:25 EDT 2009
I have also seen some really odd behavior out of the Google layers if there
is a DIV anywhere around the map with position:static. I am planning to do
some more research into this, but as a quick workaround I have had to put
the map outside of the popups layout and then dynamically position it on top
of the content area on a higher z value to work around this.
Jo Cook wrote:
>
> Hi Andreas,
>
> Yes, adding this code in a simple page with a fixed size map div worked
> fine, no displacement. I will experiment more with the mapfish setup, and
> bring this up on the mapfish list if I can't figure it out.
>
> Thanks for your help
>
> Jo
> ----- Original Message -----
> From: "Andreas Hocevar (via Nabble)"
> <ml-user+67559-1830404419 at n2.nabble.com>
> To: "Jo Cook" <j.cook at oxfordarch.co.uk>
> Sent: Friday, 24 April, 2009 21:35:30 GMT +00:00 GMT Britain, Ireland,
> Portugal
> Subject: Re: [OpenLayers-Users] displacement of google satellite data
> compared to google streetmap
>
> Jo Cook wrote:
>> Hi Andreas,
>>
>> I've tried your new patch for bug 1797 but it doesn't do anything for me.
>> I
>> don't know if it's because I'm not seeing this problem when I resize the
>> map, but when I simply switch layers. I'm not using a vector layer over
>> the
>> top, just a WMS (non baselayer), so I haven't seen the issues with popup
>> alignment.
>>
>
> So it seems your issue is a different one. Maybe you have some weird css
> on the page where you place the map? Try to use the code you posted
> below in an empty html page without css and just a map div.
>
> Other than that, does the workaround to specify the map div's width and
> height in pixels work for you?
>
> Regards,
> Andreas.
>
>
>> Andreas Hocevar-2 wrote:
>>
>>> Hi,
>>>
>>> this is a known issue, unfortunately without a good solution at the
>>> moment:
>>> http://trac.openlayers.org/ticket/1797
>>> http://trac.openlayers.org/ticket/2055
>>>
>>> A workaround is to specify the map div's width and height in pixels.
>>>
>>> Regards,
>>> Andreas.
>>>
>>> Joanne Cook wrote:
>>>
>>>> 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
>>>>
>>>>
>>>>
>>> --
>>> Andreas Hocevar
>>> OpenGeo - http://opengeo.org/
>>> Expert service straight from the developers.
>>>
>>> _______________________________________________
>>> Users mailing list
>>> Users at ...
>>> http://openlayers.org/mailman/listinfo/users
>>>
>>>
>>>
>>
>>
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>
> --
> -----------------------------------------------------
> Joanne Cook
> Senior IT Support and Development
> Oxford Archaeology (North)
> 01524 880212
> http://thehumanjourney.net
>
>
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