Sunburned Surveyor wrote: Hi,
> I'm working on one of the OJ 1.2 bugs I selected for squishing and I > had a quick question. > > Is the GML reader in OpenJUMP supposed to read features represented by > a LinearRing? I thought a LinearRing was only used as an exterior or > interior boundary of a polygon. A user filed a bug report because a > feature geometry wasn't created from a LinearRing using JUMP's > GMLReader. But I'm thikning that this isn't a bug, but an improper > understanding of how feature geometries are represented in GML. A > feature should be represented by a polygon, not a linear ring. > > If GMLReader is supposed to construct a feature goemetry (polygon?) > from a linear ring, then I'll fix the bug. If GMLReader is not > supposed to do this, because it isn't the proper way to represent a > feature, then I will close the bug. I think in GML2 this is allowed: http://schemas.opengis.net/gml/2.1.2/geometry.xsd One can always wonder why anyone would want it, but some people apparently have use cases for everything... The problem that is inherent here is, if you read the linear ring in as a polygon, what happens when exporting as GML again? Will it be exported as polygon or as linear ring? Is every linear ring also a polygon? I suppose not, as there are almost no restrictions on the form of a linear ring, but many (such as orientation of the rings, self intersections etc.) on polygons. I'm unsure on how to solve this problem though, the better you want to solve it, the more work it is obviously. Best regards, Andreas -- l a t / l o n GmbH Aennchenstrasse 19 53177 Bonn, Germany phone ++49 +228 18496-12 fax ++49 +228 1849629 http://www.lat-lon.de http://www.deegree.org
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