[wfs-dev] Axis Ordering in GML

[Paul Ramsey]

Quick clarification:

   Not legal in GML3 or in GML2 (WFS 1.0) or both?

It is GML2 I am concerned about. I have results from three WFS servers 
so far (Mapserver, Cubewerx, Intergraph) and all are returning 4326 
data in easting/northing order. A de facto implementation standard 
seems to be emerging. I want to hear what implementors have done for 
WFS 1.0, if possible!

Thanks,

Paul

On 19-May-05, at 6:33 PM, <Simon.Cox at csiro.au> wrote:

> No - it is not legal.
> The main reason is the one you identify - as will all other coordinate
> reference system definitions, EPSG 4326 does specify the axis order, 
> and
> as with all traditional geographic systems, the axis order is
> latitude-longitude.
> Furthermore, I think 4326 specifies DMSH as the encoding, though this
> aspect might have been relaxed.
> It is in fact not a GML issue, but is an EPSG issue.
> GML inherits the rules provided by the organisation that are providing
> the definition of the CRS.
>
> Two other issues:
> 1. "EPSG:4326" is not a valid URI. In Document 05-010 OGC has defined a
> URN scheme that is defined to refer to thing that you are trying to
> point to. In this case it would be urn:ogc:def:crs:EPSG:6.3:4326
> 2. the gml:coordinates element is deprecated in GML 3.0 and beyond. Use
> gml:pos instead, with spaces between the components instead of comma.
>
> Simon
>
>> -----Original Message-----
>> From: wfs-dev-bounces+simon.cox=csiro.au at opengeospatial.org
>> [mailto:wfs-dev-bounces+simon.cox=csiro.au at opengeospatial.org]
>>  On Behalf Of Paul Ramsey
>> Sent: Thursday, 19 May 2005 11:50 PM
>> To: wfs-dev at mail.opengeospatial.org
>> Subject: [wfs-dev] Axis Ordering in GML
>>
>> Question for the group. Is the GML below legal?
>>
>> <gml:Point
>> srsName="EPSG:4326"><gml:coordinates>-172.335,18.53916667</gml
>> :coordinates></gml:Point>
>>
>> I have built a GML point that references EPSG:4326 but has
>> the easting before the northing.
>>
>> If I check your WFS 1.0 servers, will I find them returning
>> GML in easting/northing order or northing/easting order for
>> EPSG:4326? This is both a theory and practice problem. In
>> theory, what should happen, and in practice, what are people doing?
>>
>> Paul
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