[OpenLayers-Users] map bounds or projection problem?

[eoinyp]

Thanks Arnd,
I made some progress, but Im not quite there yet.
Adding in the navigation control made a small difference. It works well when
I have 2 layers (no google)
see: http://www.eoinmaca.com/maps/OpenLayers/twolayers.htm
However the bounds of the area shown is still constrained. There is data
there for all US states so I think it is the line:
var bounds = new OpenLayers.Bounds(
19012.0201171875, 768402.5875,
345695.3353515625, 968859.1625); 
that constrains the display of information. I just dont know how to figure
out what the correct bounds should be! 
Again, this problem is compounded with the addition of the third layer
see: http://www.eoinmaca.com/maps/OpenLayers/threelayers.htm
I cannot zoom in on the area where the layers are overlaid on the google
map, It always brings me to north Africa! :(

Thanks for the help on the epsg. When I have only 2 layers I used
EPSG:26986, the local projection,
and when I add the google layer, I define the map projection to be
EPSG:900913, google spherical mercator.

Really puzzeled as to why it always zooms in on North africa and doesnt let
me pan to the Northeren USA.
Thanks again,

Eoinyp



Arnd Wippermann wrote:
> 
> Hi Eoinyp,
> 
> You have no navigation control added to your map.
> 
> map.addControl(new OpenLayers.Control.Navigation());
> 
> If you want use EPSG:26986, http://spatialreference.org/ref/epsg/26986/
> shows the standard extent for that projection.
> 
> You can't mix layers with different projections in one map. You declare a
> projection for your map and the layers will requested for this projection.
> OpenLayers can't reproject raster layers.
> 
> In mymap2.html you should choose sphericalMercator (EPSG:900913) for the
> projection of the map. As you have choosen for the google layer. See the
> OL
> examples for the bounds of EPSG:900913 and resolution.
> 
> You try to compound a map with three different projections. I think, the
> map
> projection is set to sphericalMercator by the google layer.
> 
> Regards,
> Arnd
> 
> -----Ursprüngliche Nachricht-----
> Von: users-bounces at openlayers.org [mailto:users-bounces at openlayers.org] Im
> Auftrag von eoinyp
> Gesendet: Dienstag, 25. August 2009 14:05
> An: users at openlayers.org
> Betreff: [OpenLayers-Users] map bounds or projection problem?
> 
> 
> Hi list,
> I am just getting started with openlayers and geoserver.
> I have two simple wms layers being served by geoserver: a layer of US
> states, and a layer of town boundaries in Massachusetts. Each of the
> layers
> display fine on their own. Showing the full extent of the mapped area.
> When
> I put them both together however, only a section of the States layer is
> shown, while the full Mass layer is shown. It is not possible to pan and
> see
> the rest of the States layer. 
> I am not entirely sure what the problem is, so im not sure how to fix it!
> The map with the states and the Mass towns layers here:
> http://www.eoinmaca.com/maps/OpenLayers/mymap3.htm
> I think it is a problem with the extent of the bounds of the  layers
> defined. What should it be set to?
> currently it is:  
> 
> var bounds = new OpenLayers.Bounds(
> 19012.0201171875, 768402.5875,
> 345695.3353515625, 968859.1625);
> 
> The layers have different EPSGs - is this a problem?
> 
> The problem is compounded when I add in a googleEarth baselayer. It shows
> the full extent of the google layer, but when I zoom in I cant pan to the
> Mass area. The pan functionality seems to be constrained to a small area.
> The map with the google base layer is available here:
> http://www.eoinmaca.com/maps/OpenLayers/mymap2.htm
> 
> 
> If the bounds is the problem, is there a simple way of figuring out what
> the
> bounds of my map need to be?
> 
> Many thanks,
> 
> Eoinyp
> 
> 
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