[OpenLayers-Dev] projection through urn syntax

[bartvde at osgis.nl]

It's already there, I did not look properly:

http://proj4js.org/lib/proj4js-combined.js

Best regards,
Bart

> Makes sense when you put it like that.
>
> It would help a lot if there would be an online version of proj4js, which
> one could include in the respective OpenLayers examples and tests. Or do
> we want to duplicate this in OpenLayers svn (I guess not)?
>
> Best regards,
> Bart
>
>> Le Lundi 4 Mai 2009 14:02, bartvde at osgis.nl a écrit :
>>> The only question left is do we want to depend on proj4js for this?
>>>
>>> Reading urn type projections will require proj4js, is that an
>>> acceptable
>>> dependency for OpenLayers?
>>
>> If we look at the WMS 1.3.0 specs (for instance), the CRS can be URI
>> (EPSG:4326), URN (urn:ogc:def:crs:EPSG:6.6:4326) or URL
>> (http://epsg.org/#4326). The process of reading a projection attribute
>> in
>> OL
>> is to convert the string definition into an OL.Projection object.
>>
>> If OL relies upon PROJ4JS, it sounds ok to let PROJ4JS parses the
>> string.
>> Either the reader knows and it is ok, or the reader does know and the
>> error
>> is handed over back to OL.Projection constructor.
>>
>> If OL parses the string, it will have to know which one is supported by
>> the
>> underlaying reader. The later can evolve and support more and then
>> OL.Projection will have to be changed.
>>
>> So, I prefer the CRS reader understanding or not the string definition
>> and
>> OL.Projection just acting as a proxy.
>>
>> Sincerely,
>>
>> didier
>>
>>>
>>> Best regards,
>>> Bart
>>>
>>> > Hi Didier,
>>> >
>>> > great! I had not seen that.
>>> >
>>> > So I can just pass a urn string to the OpenLayers.Projection object
>>> > constructor.
>>> >
>>> > Best regards,
>>> > Bart
>>> >
>>> >> Le Lundi 4 Mai 2009 13:25, bartvde at osgis.nl a écrit :
>>> >>> Hi list,
>>> >>>
>>> >>> Currently Proj4js and OpenLayers use EPSG:XXXX as the syntax for
>>> >>> projections, whereas OWSContext uses the urn syntax, for example:
>>> >>>
>>> >>> urn:ogc:def:crs:EPSG:6.6:4326
>>> >>>
>>> >>> So in my OWSContext Format I use a small utility function which
>>> >>> transforms
>>> >>> this into EPSG:4326.
>>> >>>
>>> >>> The urn syntax can also be present in GML3 files.
>>> >>>
>>> >>> Question:
>>> >>> -would this belong in OpenLayers' Projection.js or in Proj4js?
>>> >>
>>> >> I have added URN in Proj4js. At least, it is in the trunk (See
>>> >> http://trac.osgeo.org/proj4js/ticket/17)
>>> >>
>>> >> didier
>>> >>
>>> >>> Best regards,
>>> >>> Bart
>>> >>>
>>> >>> _______________________________________________
>>> >>> Dev mailing list
>>> >>> Dev at openlayers.org
>>> >>> http://openlayers.org/mailman/listinfo/dev
>>> >>
>>> >> --
>>> >> Didier RICHARD, chef du pôle technique Géoportail pour l'IGN
>>> >> Institut Geographique National           tel: +33/0 1.43.98.83.23
>>> >> 2/4 Avenue Pasteur                       fax: +33/0 1.43.98.80.88
>>> >> F-94165 St-Mande Cedex                e-mail: Didier.Richard at ign.fr
>>
>> --
>> Didier RICHARD, chef du pôle technique Géoportail pour l'IGN
>> Institut Geographique National           tel: +33/0 1.43.98.83.23
>> 2/4 Avenue Pasteur                       fax: +33/0 1.43.98.80.88
>> F-94165 St-Mande Cedex                e-mail: Didier.Richard at ign.fr
>>
>>
>
>
>