[wfs-dev] SRS of LatLongBoundingBox

David McCullough dmccullough at questerra.com
Wed Sep 1 21:55:21 EST 2004


Thanks for the clarification. 

This also means that the CITE test data that I mentioned in an earlier
post is correct then.

-----Original Message-----
From: Panagiotis (Peter) A. Vretanos [mailto:pvretano at cubewerx.com]
Sent: Wednesday, September 01, 2004 7:35 PM
To: David McCullough
Subject: Re: [wfs-dev] SRS of LatLongBoundingBox


The text of the WFS specification is correct.

I made a mistake calling it LatLongBoundingBox and did not realize the 
inconsistency until after the specification was published and more 
importantly after a number of implementation where already done!

In the mean time, further confusion has arisen since some 
implementations advertise EPSG:4326 to make the LatLongBoundingBox 
seemingly consistent when in fact the feature data is in a projected 
coordinate system.

More confusion still arises from the fact that the WMS has a 
LatLongBoundingBox that is, correctly, supposed to be in EPSG:4326 and a

seperate element (BoundingBox) that can be in a specified SRS.

An unfortunate state of affairs that should be rectified with the 
release of V1.1 of the WFS specification.

It relies on the OGC Common Implementation Specification (04-016r4 I 
think) which outlines in great detail how to specify bounding boxes in 
XML documents.


David McCullough wrote:
> This question concerns the optional <LatLongBoundingBox>[s] that may
> returned in the <FeatureType> elements of a GetCapabilities response.
> I'm having some confusion about what SRS the coordinates should be
> relative to. 
> The WFS-capabilities.xsd schema file says that a <LatLongBoundingBox>
> should indicate the edges of the enclosing rectangle in the SRS of the
> associated feature. That seems clear, but then why is the element
> LatLongBoundingBox? That seems to me to imply that the coordinates are
> geodetic, regardless of the associated feature's SRS. Which is
> Thanks.
> -Dave
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> wfs-dev at opengis.org
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Panagiotis (Peter) A. Vretanos          CubeWerx Inc.
Big Kahuna (Senior Database Developer)  http://www.cubewerx.com
Tel. 416-701-1985  Fax. 416-701-9870    pvretano at cubewerx.com

"To you it's a mess; to me it's a wilderness of free association!"

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