behaves as a breakline except that countour lines generated for the surface can be smoothed where they cross soft breaks
encloses a voided area of the TIN surface. the boundary LineStrings of the Polygon behave as breaklines in that triangles in the Patches attribute of the TIN value must be adjusted so that void boundary becomes an edge of two or more triangles. However, for drape voids, the elevation of the original TIN surface takes precedence over. The area bounded by TIN elements having a 'break void', 'drape void', 'void' and 'hole' element type are still considered to be part of the TIN surface, rather than a hole bounded by an interior boundary of the surface. This distinction is significant when merging two TIN surfaces.
encloses an area of the TIN surface designated as a hole. the boundary LineStrings of the Polygon behave as breaklines in that triangles in the Patches attribute of the TIN value must be adjusted so that becomes an edge of two or more triangles. Hole boundaries are treated like drape void boundaries in that the elevation of the original TIN surface The area bounded by TIN elements having a 'break void', 'drape void', 'void' and 'hole' element type are still considered to be part of the TIN surface, rather than a hole bounded by an interior boundary of the surface. This distinction is significant when merging two TIN surfaces.
encloses a voided area of the TIN surface. the boundary LineStrings of the Polygon behave as breaklines in that triangles in the Patches attribute of the TIN value must be adjusted so that void boundary becomes an edge of two or more triangles. The elevation of this break void boundary takes precedence over the elevation of the original. The area bounded by TIN elements having a 'break void', 'drape void', 'void' and 'hole' element type are still considered to be part of the TIN surface, rather than a hole bounded by an interior boundary of the surface. This distinction is significant when merging two TIN surfaces.
represents points on the surface of known elevation from which triangles can be generated
reprrepresents a local ridge or depression in the TIN surface. When a breakline is specified for a TIN value, triangles in the Patches attribute of the TIN value must be adjusted so that no triangle is crossed by the breakline. The elevation along the breakline takes precedence over the elevation of the original TIN surface for the entire length of the breakline. During (re)triangulation, Triangle values in the vicinity of each breakline are adjusted so that, if the Triangle value intersects the LineString breakline value, then either: a) one of the Point values in the ExteriorRing attribute value of the Triangle value is spatially 3D equal to one of the Point values in the Points attribute of the ST_LineString value of the breakline, or b) two of the Point values in the ExteriorRing attribute of the Triangle value are spatially 3D equal to two consecutive Point values in the Points triangle lies along the breakline.
represent areas where the local continuity or regularity of the TIN surface is questionable. indicator of places where the contour lines of a TIN surface are irregular or not continuous. It is implementation-defined whether the Triangle values in the Patches attribute whose boundaries are crossed by a stop line are removed from the Patches attribute collection of Triangle values. If they remain in the collection, it is implementation-defined whether they are enclosed within a 'drape void' type of TinElement.
used to define the boundary in the resulting TIN value the TIN surface value is clipped to the Polygon value. There can be at most only one such element for each TIN value. Interior boundaries may be supported.
encloses a voided area of the TIN surface. the boundary LineStrings of the Polygon behave as breaklines in that triangles in the PrivatePatches attribute of the TIN value must be adjusted boundary becomes an edge of two or more triangles. However, for regular voids, only the elevations of the void boundary vertices take precedence these vertices are treated as points for triangulating. The regular void elevations from the original surface take precedence. The area bounded by TIN elements having a 'break void', 'drape void', 'void' and 'hole' element type are still considered to be part of the TIN surface, rather than a hole bounded by an interior boundary of the surface. This distinction is significant when merging two TIN surfaces.
subtype of PolyhedralSurface composed of contiguous triangle surfaces (Triangle) connected along their common boundary linestrings. This differs from PolyhedralSurface in the restriction on the types of surface patches
represents a collection of related points on the surface of known elevation from which triangles can be generated. A 'group spot' type of TIN element will usually have a non-NULL ElementID or ElementTag to differentiate it from other 'group spot' TIN elements.
additional TIN element types, what type of ST_Geometry each requires, and what behavior is to be expected during triangulation