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<div align="left">Olivier</div>
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<div align="left">in #568 you write:</div>
<div align="left">"As a consequence closed surface (so volume) have a 0 perimeter value return"</div>
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<div align="left">Is it so. Isn't it nessecary to be able to describe a closed survace without handling it as a volum or polyhedron?</div>
<div align="left">I mean like a closed linestring. Sometimes you just want a closed linestring not a polygon.</div>
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<div align="left">I thought this was to opff topic in #568 so I put it in a separate post.</div>
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<div align="left">Does the spec say anything about this?</div>
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<div align="left">The difference shows for example when we measure distance from a closed survace/volum to a point inside it. If it is a volum the distance is 0 if it is just a closed surface there is a distance to calculate to the closest facet.</div>
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<div align="left">/Nicklas</div>
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