[postgis-users] Dimension of PolyhedralSurface

[Andrea Peri]

Hi,
I notice the add of the Polyhedral Surface to GML.
It is very interesting.

But I have a little question:
see-ing the code I notice the srsDimension of posList is ="2".
I will think the correct value was "3".
Certainly the value of coordinate used are of a 2D dimension.
But I don't understand why a Polyhedral surface must have a definition on a
2D universe.
Or it is the 2D envelope of a Polyhedral Surface ?


<gml:PolyhedralSurface srsName="EPSG:4326">
  <gml:polygonPatches>
    <gml:PolygonPatch>
      <gml:exterior>
        <gml:LinearRing>
          <gml:posList srsDimension="2">0 1 2 3 4 5 0 1</gml:posList>
        </gml:LinearRing>
      </gml:exterior>
    </gml:PolygonPatch>
    <gml:PolygonPatch>
      <gml:exterior>
        <gml:LinearRing>
          <gml:posList srsDimension="2">6 7 8 9 10 11 6 7</gml:posList>
        </gml:LinearRing>
      </gml:exterior>
    </gml:PolygonPatch>
  </gml:polygonPatches>
</gml:PolyhedralSurface>

-- 
-----------------
Andrea Peri
. . . . . . . . .
qwerty àèìòù
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