gml:Triangle

gml:Triangle represents a triangle as a surface patch with an outer boundary consisting of a linear ring. Note that this is a polygon (subtype) with no inner boundaries. The number of points in the linear ring shall be four.
The ring (element exterior) shall be a gml:LinearRing and shall form a triangle, the first and the last position shall be coincident.
interpolation is fixed to "planar", i.e. an interpolation shall return points on a single plane. The boundary of the patch shall be contained within that plane.

Element information

Content

• gml:exterior [1..1]A boundary of a surface consists of a number of rings. In the normal 2D case, one of these rings is distinguished as being the exterior boundary. In a general manifold this is not always possible, in which case all boundaries shall be listed as interior boundaries, and the exterior will be empty.

Attributes

Used in

• Type gml:SurfacePatchArrayPropertyType (Elements gml:polygonPatches, gml:trianglePatches, gml:patches)

Substitution hierarchy

• gml:AbstractSurfacePatch
  • can be substituted with gml:Triangle

Sample instance

<gml:Triangle>
   <gml:exterior>
      <gml:LinearRing>
         <gml:pos>1.0 1.0</gml:pos>
      </gml:LinearRing>
   </gml:exterior>
</gml:Triangle>