[OpenLayers-Users] Re: WMS over Google Maps when panning tiles
not in synch
Alessandro Ferrucci
alessandroferrucci at gmail.com
Tue Jul 26 07:54:42 EDT 2011
Hi Andreas,
I know it doesn't make sense which is why I was wondering how you were
doing that (I was prototyping something using the Google Maps API and
could not figure out how to *NOT* have 45 degrees arial imagery). I
figured out it was through the .setTilt(0) method.
Thank you,
Alessandro Ferrucci
On Tue, Jul 26, 2011 at 6:40 AM, Andreas Hocevar <ahocevar at opengeo.org> wrote:
> Hi,
>
> OpenLayers.Layer.GoogleNG uses the GMaps API on a lower level, and doesn't switch to the 45° aerial view at high zoom levels. It wouldn't make much sense in 2D maps with overlays.
>
> Andreas.
>
> On Jul 25, 2011, at 22:00 , Alessandro Ferrucci wrote:
>
>> Hey Thank you that worked.
>>
>> I have another question. I'm using google maps v3, when I used
>> OpenLayers.Layer.Google with a Hybrid layer there were parts of the
>> country (like Oakland california) where when I zoomed at the lowest
>> level Google would automatically switch to Arial imagery.
>>
>> When I use OpenLayers.Layer.GoogleNG (without switching the google API
>> js link) this does not occur (google returns tiles in standard Hybrid
>> top down view). Do you know if OpenLayers is doing something special
>> to cause this behavrior?
>>
>> thanks
>> Alessandro Ferrucci
>>
>> On Sun, Jul 24, 2011 at 5:00 PM, Andreas Hocevar <ahocevar at opengeo.org> wrote:
>>> If you're using OpenLayers trunk from svn, you can use OpenLayers.Layer.GoogleNG instead of OpenLayers.Layer.Google. All tiles will then move in sync. See http://openlayers.org/dev/examples/google-ng.html for an example.
>>>
>>> Andreas.
>>>
>>> On Jul 24, 2011, at 22:02 , Alessandro Ferrucci wrote:
>>>
>>>> I am trying to verify that I don't see this behavior with google maps
>>>> v2. I switched the google maps script to specify v=2 but I still get
>>>> the delayed tile dragging.
>>>>
>>>> On Sun, Jul 24, 2011 at 3:56 PM, Alessandro Ferrucci
>>>> <alessandroferrucci at gmail.com> wrote:
>>>>> I am experiencing the exact same of what this ticket says:
>>>>>
>>>>> http://trac.osgeo.org/openlayers/ticket/2929
>>>>>
>>>>> does this mean that currently it's an issue in google maps v3?
>>>>>
>>>>> Thanks,
>>>>> Alessandro Ferrucci
>>>>>
>>>>> On Sun, Jul 24, 2011 at 3:50 PM, Alessandro Ferrucci
>>>>> <alessandroferrucci at gmail.com> wrote:
>>>>>> Hello,
>>>>>> I have the following code
>>>>>>
>>>>>> var map;
>>>>>> var projectionWGS84 = new OpenLayers.Projection("EPSG:4326");
>>>>>> var projectionMercator = new OpenLayers.Projection("EPSG:900913");
>>>>>> // Avoid pink error tiles
>>>>>> OpenLayers.IMAGE_RELOAD_ATTEMPTS = 3;
>>>>>> OpenLayers.Util.onImageLoadErrorColor = "transparent";
>>>>>>
>>>>>> function init(){
>>>>>> var options = {
>>>>>> projection: new OpenLayers.Projection("EPSG:900913"),
>>>>>> displayProjection: new OpenLayers.Projection("EPSG:4326"),
>>>>>> units: "m",
>>>>>> maxResolution: 156543.0339,
>>>>>> maxExtent: new OpenLayers.Bounds(-20037508,
>>>>>> -20037508,20037508, 20037508),
>>>>>> restrictedExtent: new
>>>>>> OpenLayers.Bounds(-164.88281,5.09094,-41.39648,52.69636).transform(projectionWGS84,projectionMercator),
>>>>>> controls:[
>>>>>> new OpenLayers.Control.Navigation(),
>>>>>> new OpenLayers.Control.ArgParser(),
>>>>>> new OpenLayers.Control.Attribution(),
>>>>>> new OpenLayers.Control.PanZoomBar({ position:
>>>>>> new OpenLayers.Pixel(2, 15) }),
>>>>>> new OpenLayers.Control.Scale($('scale')),
>>>>>> new OpenLayers.Control.LayerSwitcher(),
>>>>>> new OpenLayers.Control.MousePosition(),
>>>>>> new OpenLayers.Control.Permalink()
>>>>>> ]
>>>>>> };
>>>>>> map = new OpenLayers.Map('map',options);
>>>>>> var googleHibridLayer = new OpenLayers.Layer.Google(
>>>>>> "Google Hibrid", {type: google.maps.MapTypeId.HYBRID,
>>>>>> 'sphericalMercator': true,isBaseLayer: true } );
>>>>>> var googleStreetLayer = new OpenLayers.Layer.Google(
>>>>>> "Google Street", {'sphericalMercator':true} );
>>>>>> var addressLayer = new OpenLayers.Layer.WMS(
>>>>>> "Addresses", "<WMS SERVER HOSTNAME>",
>>>>>> {
>>>>>> LAYERS: 'cira:address',
>>>>>> STYLES: '',
>>>>>> format: 'image/png',
>>>>>> tiled: true,
>>>>>> transparent:true,
>>>>>> tilesOrigin : map.maxExtent.left + ',' +
>>>>>> map.maxExtent.bottom
>>>>>> },
>>>>>> {
>>>>>> buffer: 10,
>>>>>> displayOutsideMaxExtent: true,
>>>>>> isBaseLayer: false
>>>>>> }
>>>>>> );
>>>>>>
>>>>>> map.addLayers([googleStreetLayer,googleHibridLayer,addressLayer]);
>>>>>> var USABounds=new
>>>>>> OpenLayers.Bounds(-124.731,24.956,-66.97,49.372);
>>>>>> USABounds.transform(projectionWGS84,map.getProjectionObject());
>>>>>> map.zoomToExtent(USABounds);
>>>>>> }
>>>>>>
>>>>>> The WMS looks to be overlaying fine, but when I pan the map the tiles
>>>>>> look like they are "shifting plates" meaning they look like they are
>>>>>> moving independently and it looks quite ugly.
>>>>>>
>>>>>> I have tried adding "projection: new
>>>>>> OpenLayers.Projection("EPSG:900913")," as an option to the WMS layer
>>>>>> itself thinking maybe that would fix it but it did not.
>>>>>>
>>>>>> I'm using stable Openlayers 2.10
>>>>>> Any ideas?
>>>>>>
>>>>>> Thank you,
>>>>>> --
>>>>>> Signed,
>>>>>> Alessandro Ferrucci
>>>>>>
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Signed,
>>>>> Alessandro Ferrucci
>>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> Signed,
>>>> Alessandro Ferrucci
>>>> _______________________________________________
>>>> Users mailing list
>>>> Users at lists.osgeo.org
>>>> http://lists.osgeo.org/mailman/listinfo/openlayers-users
>>>
>>> --
>>> Andreas Hocevar
>>> OpenGeo - http://opengeo.org/
>>> Expert service straight from the developers.
>>>
>>>
>>
>>
>>
>> --
>> Signed,
>> Alessandro Ferrucci
>
> --
> Andreas Hocevar
> OpenGeo - http://opengeo.org/
> Expert service straight from the developers.
>
>
--
Signed,
Alessandro Ferrucci
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