Re: [OpenLayers-Users] Map Aspect Ratio Seems Off (Makes layers wide)

2009-06-22 Thread soatley 

Andreas,

Thank you for that information!  You've solved my problem and even fixed one
of my todo items of getting the MousePosition into UTM!

Thanks
Shawn


Andreas Hocevar-2 wrote:
> 
> Hi,
> 
> On Fri, Jun 19, 2009 at 10:38 PM, soatley wrote:
> 
> Your co-workers are right. Maps in geographic coordinates (EPSG:4326)
> look like that. The further you get away from the equator, the more
> the map will be shrunk in latitudinal direction. This is not a bug,
> but a matter of choosing the appropriate map projection.
> 
>> The GIS staff tell me that our data is projected in UTM 17N NAD83.
> 
> The EPSG code for this projection is probably EPSG:26917. See
> http://spatialreference.org/ref/epsg/26917/
> 
> So the two things to change in your code is that you set the
> projection to EPSG:26917 instead of EPSG:4326, set units to "m"
> (meters), and provide the maxExtent in projected coordinates.
> 
> Regards,
> Andreas.
> 
> 
> 
> 

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Re: [OpenLayers-Users] Map Aspect Ratio Seems Off (Makes layers wide)

2009-06-21 Thread Andreas Hocevar 
Hi,

On Fri, Jun 19, 2009 at 10:38 PM, soatley wrote:
>
> I am having an issue with the aspect ratio of my map and my knowledge of
> projections is not that good, but my GIS co-workers are telling me that is
> probably the cause.  The attached image(
> http://n2.nabble.com/file/n3122010/example.jpg example.jpg ) shows what the
> map should look like (our existing mapping software) and how OL is
> displaying it.

Your co-workers are right. Maps in geographic coordinates (EPSG:4326)
look like that. The further you get away from the equator, the more
the map will be shrunk in latitudinal direction. This is not a bug,
but a matter of choosing the appropriate map projection.

> The GIS staff tell me that our data is projected in UTM 17N NAD83.

The EPSG code for this projection is probably EPSG:26917. See
http://spatialreference.org/ref/epsg/26917/

So the two things to change in your code is that you set the
projection to EPSG:26917 instead of EPSG:4326, set units to "m"
(meters), and provide the maxExtent in projected coordinates.

Regards,
Andreas.

> I hope I have provided enough information for someone to help me.
>
> Thanks!
> Shawn
> --
> View this message in context: 
> http://n2.nabble.com/Map-Aspect-Ratio-Seems-Off-%28Makes-layers-wide%29-tp3122010p3122010.html
> Sent from the OpenLayers Users mailing list archive at Nabble.com.
>
> ___
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> http://openlayers.org/mailman/listinfo/users
>



-- 
Andreas Hocevar
OpenGeo - http://opengeo.org/
Expert service straight from the developers.
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[OpenLayers-Users] Map Aspect Ratio Seems Off (Makes layers wide)

2009-06-19 Thread soatley 

I am having an issue with the aspect ratio of my map and my knowledge of
projections is not that good, but my GIS co-workers are telling me that is
probably the cause.  The attached image(
http://n2.nabble.com/file/n3122010/example.jpg example.jpg ) shows what the
map should look like (our existing mapping software) and how OL is
displaying it.

Here is how I instantiate my map object:

OpenLayers.Layer.cWMS = OpenLayers.Class(OpenLayers.Layer.WMS, {
isClickable: false

});


 options = {
projection: new OpenLayers.Projection("EPSG:4326"),
maxExtent: new OpenLayers.Bounds(-79.287519, 42.920835, -78.956522,
43.156),
tileSize: new OpenLayers.Size(256, 256),
maxResolution: 2 / 256,
numZoomLevels: 15,

controls: [new OpenLayers.Control.LayerSwitcher(),
new OpenLayers.Control.MouseDefaults(),
new OpenLayers.Control.PanZoomBar(),
new OpenLayers.Control.OverviewMap(),
new OpenLayers.Control.KeyboardDefaults(),
new OpenLayers.Control.Navigation(),
new OpenLayers.Control.MousePosition({ div:
$j("#position").get(0) }),
new OpenLayers.Control.LoadingPanel(),
new OpenLayers.Control.ScaleBar()
]
};


map = new OpenLayers.Map('map', options);

var BaseMap = new OpenLayers.Layer.cWMS("Base Map",
["http://wmsServer/wms.png","http://wmsServer2/wms.png";],
{ 
 layers: "BaseW Drawing,Background Colour,RoadCL 
Drawing,Surrounding
Lands Labels",
 format: "image/png",
 transparent: false
},
{ 
 visibility: true,
 isClickable: false
}
);

map.addLayers([BaseMap]);





You can see that I've extended the WMS layer just so that I can add the
'isClickable' property.  The map was skewed before I created that, so that
is not the issue.

The GIS staff tell me that our data is projected in UTM 17N NAD83.  

I hope I have provided enough information for someone to help me.

Thanks!
Shawn
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