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mass point Irregularly distributed sample points, each with an x,y location and a z value, which are used as the basic elements to build a tin. Each mass point has important, yet equal, significance in terms defining the tin surface.
A TIN comprises a triangular network of vertices, known as mass points, with associated coordinates in three dimensions connected by edges to form a triangular tessellation.
Multipoint feature classes of 3D mass points created from a data source such as lidar or sonar
3D point and line feature classes created on photogrammetric workstations using stereo imagery ...
 See also: Surface, Raster, Analysis, GIS, Vector
  
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