[mapguide-users] Fusion and Open layers Coordinate systems

[Mike Adair]

It's a shame MapGuide doesn't use EPSG codes  :-)

OpenLayers applications typically would use Proj4js to do client side 
transformations which is based on PROJ.4 which can use EPSG codes and/or 
custom initialization parameters.  I haven't heard of anyone converting 
CS-Map to Javascript.

Mike

Scott hameister wrote:
> It's a shame OpenLayers doesn't use mentor/CS-Map...I thought I read
> somewhere that it was going to? Anyone? 
>
> -----Original Message-----
> From: mapguide-users-bounces at lists.osgeo.org
> [mailto:mapguide-users-bounces at lists.osgeo.org] On Behalf Of Jason Birch
> Sent: Wednesday, October 07, 2009 11:28 AM
> To: MapGuide Users Mail List
> Subject: Re: [mapguide-users] Fusion and Open layers Coordinate systems
>
> I know this is neither here nor there, but I believe there are many
> valid projections that do not have EPSG codes. Defaulting to LL when
> many "non-standard" CS are liner-units-based may not be the best
> approach. Would it not be possible to disable coordinate transforms if
> there is no code available?
>
> Jason
>
> On 2009-10-07, Mike Adair <madair at dmsolutions.ca> wrote:
>   
>> I'm currently working on a patch to retrieve the projection info from
>> the map definition for MapGuide.  The problem is that MG uses WKT and
>> OpenLayers/Fusion uses EPSG codes and MG doesn't always have an EPSG/WKT
>> mapping available.  So I will be implementing this so that if MG returns
>> a valid EPSG code it will use that, otherwise it will take a value from
>> the ApplicationDefinition file, and if there still isn't an EPSG code
>> available then the projection will be set to the OpenLayers default of
>> EPSG:4326.
>>
>> Mike
>>
>>
>>
>> Flipper wrote:
>>     
>>> Im trying my hand at some Open Layers programming. I'm trying to set the
>>> maps
>>> Coordinate system to match Mapguides, So I decided to peek into
>>>       
> Fusion....
>   
>>> One thing for the life of me I can't find is where fusion sets the
>>> OpenLayer
>>> Maps Coordinate system. I know Open layers uses Proj 4, and Mapguide Can
>>> use
>>> both cs-map and Proj4...I know how to get the coordinate system
>>> Description
>>> out of Mapguide...But how do I push it back into OpenLayers Using my
>>> PROJCS
>>> system...
>>> Or worded Much simpler...How/Where does Fusion do this to openLayers...I
>>> want this to work on anymap...so I don't want to hard code a EPSG code
>>> into
>>> it, and several users will have Non PROJ4 coordinate systems, like Local
>>> County Coordinate systems that CS-MAP allows them to use...
>>> ANYONE?
>>>
>>>       
>> --
>>    Michael Adair
>>    Senior Software Architect
>>    DM Solutions Group Inc.
>>
>>    Office: (613) 565-5056 x26
>>    madair at dmsolutions.ca
>>    http://www.dmsolutions.ca
>>    http://research.dmsolutions.ca
>>
>>
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>>
>>     
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>   

-- 
   Michael Adair
   Senior Software Architect
   DM Solutions Group Inc.

   Office: (613) 565-5056 x26
   madair at dmsolutions.ca
   http://www.dmsolutions.ca
   http://research.dmsolutions.ca