land:Faces

The collection of faces that defined the surface.

The faces are defined by either 3 (TIN) or 4 (grid) points, as indicated by the "surfType" attribute

For the north/east/elev values, each point of the face references a "P"point element point in the SurfPnts collection.

Element information

Content

• Sequence [1..1]
  1. land:F [1..*]    A surface face. It contains a space delimited list of "id" references for 3 (TIN) or 4 (grid) surface "P" points. The 3 or 4 numbers represent the vertices on the face. Each number is a reference to the ID value of a surface point "P" for the face coordinates. Attribute "i" is optional, where a value of "1" indicating the face is part of the triangulation but is invisible. Attribute "n" is optional, space delimited face index values indicating the adjacent face index for each face edge, where a value of "0" (an invalid face index value) indicates the edge has NO neighboring face. The face index value is implied and defined from 1 to n number of F elements in a a single Faces collection. Example: Where 2 is the neighboring face index for the edge 10 to 20, 0 means no neighbor between 20 and 30 and 3 is the neighbor index for 30 to 10.
  2. land:Feature [0..*]    Used to include additional information that is not explicitly defined by the LandXML schema, Feature may contain one or more Property, DocFileRef or nested Feature elements. NOTE: to allow any valid content, the explicit definitions for Property, DocFileRef and Feature have been commented out, but are still expected in common use.Each Property element defines one piece of data.

Attributes

Used in

• Anonymous type of element land:Definition

Sample instance

<land:Faces>
   <land:F>Any text, intermingled with:1 1</land:F>
   <land:Feature>
      <!--any element-->
   </land:Feature>
</land:Faces>