[wfs-dev] Axis Ordering in GML

[Simon.Cox at csiro.au]

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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