[OpenLayers-Users] Re: WMS over Google Maps when panning tiles not in synch

[Alessandro Ferrucci]

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