TerraScan’s Ground Routine is designed to classify a ground surface from point data. There are multiple parameters within the filter. The following chart is a summary and general guidelines for setting the parameters.
|Max Building Size||Grid size for initial seed surface||Smaller is more aggressive, higher fidelity, but more false ground points in initial surface|
|Terrain Angle||Max terrain angle||Maximum slope plus 10 – 15°; 88° in areas of near vertical features (cliffs, retaining walls)|
|Iteration Angle||Maximum value at which a point will be added to the ground surface||Higher is more aggressive; typical is 4 – 10°|
|Iteration Distance||Maximum height above surface at which a point will be added to the ground surface||Higher is more aggressive; typical is 0.5 – 1.5 m|
|Reduce Iteration Angle||Soft stop; adds less points in areas with greater point density||½ of desired grid spacing|
|Stop Triangulation||Hard stop; ensures no triangles with an edge smaller than the specified value||¼ of desired grid spacing|