[fdo-dev] FGF polygon

Haris Kurtagic haris at sl-king.com
Wed Oct 25 10:04:52 EDT 2006

Thanks for answear.
I hoped it would be a rule.
I asked this question beacuse in fdo provider I am getting polygon whith
outer ring which is not counter-clockwise
This request comes from MG when it queries for selection of feature.
I didn't quite unterstood why enforcing such rule would cause


From: Gavin Cramer [mailto:gavin.cramer at autodesk.com] 
Sent: Wednesday, October 25, 2006 3:58 PM
To: dev at fdo.osgeo.org
Subject: RE: [fdo-dev] FGF polygon

Hello, Haris.
Nominally, we would refer to the OGC abstract specifications, which has
outer rings as counter-clockwise and inner rings as clockwise for the
upward-facing surface.  Most data sources (that care) use this rule.
However, handling of FGF generally does not enforce such a rule, in
order to avoid incompatibility with any data sources that may vary.  Any
enforcement would have to take place in the FDO Provider for a specific
data source.


From: Haris Kurtagic [mailto:haris at sl-king.com] 
Sent: Wednesday, October 25, 2006 7:24 AM
To: dev at fdo.osgeo.org
Subject: [fdo-dev] FGF polygon

Is order of points defined in FGF polygon?
Does outer line string is always in counter/clockwise and inner in ...
Is there any rule on which we can count on? 
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