[OpenLayers-Users] zooming out when changing base layer

[Erik Uzureau]

I tried loading this locally and none of the tiles load.
Is there a live version you could send a link to?

On 12/11/06, Bart van den Eijnden (OSGIS) <bartvde at osgis.nl> wrote:
> Hi Erik,
>
> but with WMS Untiled, I do not specify an extent nor a resolution for a
> layer.
>
> How does this relate then to WMS Untiled? Is there a way around it?
>
> This is my code:
>
>         function mapinit(){
>             map = new OpenLayers.Map( $('map'), { controls: [],
> 'projection': 'EPSG:28992', 'units':'meters', 'maxExtent': new
> OpenLayers.Bounds(-157973.103596, 300670.145842, 472056.321374,
> 678687.800824) , 'maxResolution':'auto'});            var layer = new
> OpenLayers.Layer.WMS.Untiled( "Topografische kaart Nederland",
>
> "http://intranet.rijkswaterstaat.nl/services/geoservices/basispakket/topografie?",
> {layers: 'AAA126,AAA127,AAA134', 'format':'image/jpeg',
> 'transparent':'true'}, {'ratio':1, isBaseLayer: true} );
>
>             map.addLayers([layer]);            var layer = new
> OpenLayers.Layer.WMS.Untiled( "Luchtfoto's Nederland",
>
> "http://intranet.rijkswaterstaat.nl/services/geoservices/basispakket/luchtfoto?",
> {layers: 'AAA216', 'format':'image/jpeg', 'transparent':'true'}, {'ratio':1,
> isBaseLayer: true} );
>
>             map.addLayers([layer]);            var layer = new
> OpenLayers.Layer.WMS.Untiled( "Nationaal Wegen Bestand Wegen wegvakken",
>
> "http://intranet.rijkswaterstaat.nl/services/geoservices/basispakket/nationaalwegenbestand?",
> {layers: 'AAA70', 'format':'image/gif', 'transparent':'true'}, {'ratio':1,
> isBaseLayer: false} );
>
>             map.addLayers([layer]);            var layer = new
> OpenLayers.Layer.WMS.Untiled( "Top250namen",
>
> "http://intranet.rijkswaterstaat.nl/services/geoservices/basispakket/topografie?",
> {layers: 'AAA133', 'format':'image/gif', 'transparent':'true'}, {'ratio':1,
> isBaseLayer: false} );
>
>             map.addLayers([layer]);            if (!map.getCenter())
> map.zoomToMaxExtent();
>             map.addControl(new OpenLayers.Control.LayerSwitcher());
>             map.addControl(new OpenLayers.Control.PanZoomBar());
>             map.addControl(new OpenLayers.Control.MouseDefaults());
>         }
>
> Best regards,
> Bart
>
> --
> Bart van den Eijnden
> OSGIS, Open Source GIS
> http://www.osgis.nl
>
>
> --------- Oorspronkelijk bericht --------
> Van: Erik Uzureau <euzuro at gmail.com>
> Naar: Bart van den Eijnden OSGIS <bartvde at osgis.nl>
> Cc: users at openlayers.org
> Onderwerp: Re: [OpenLayers-Users] zooming out when changing base layer
> Datum: 11/12/06 09:16
>
> > When you switch between base layers, OpenLayers tries to find the
> > nearest approximate
> > zoom for the new base layer.
> >
> > So what is happening is that when you switch from baselayer A to baselayer
> B
> >
> > 1) records current extent of map in baselayer A
> > 2) switches to base layer B
> > 3) calls zoomToExtent() on stored extent from base layer A
> >
> > if the resolutions/scales array for your two base layers are not the same,
> > this would explain the behaviour.
> >
> > Note that with the commercial layers (google, yahoo, etc) we have
> specifically
> > hard coded the resolutions array so that it will be more consistent with
> wms
> > layers (due to projection differences).
> >
> > On 12/11/06, Bart van den Eijnden (OSGIS) &lt;bartvde at osgis.nl&gt; wrote:
> > &gt; Hi list,
> > &gt;
> > &gt; I have 2 base layers and several overlays, all are WMS Untiled.
> > &gt;
> > &gt; When I change the base layer, the application zooms out.
> > &gt;
> > &gt; Is this a bug?
> > &gt;
> > &gt; Best regards,
> > &gt; Bart
> > &gt;
> > &gt; --
> > &gt; Bart van den Eijnden
> > &gt; OSGIS, Open Source GIS
> > &gt; http://www.osgis.nl
> > &gt;
> > &gt;
> > &gt;
> > &gt;
> > &gt;
> > &gt; _______________________________________________
> > &gt; Users mailing list
> > &gt; Users at openlayers.org
> > &gt; http://openlayers.org/mailman/listinfo/users
> > &gt;
> >
> >
>
>
>
>