LP360 Adaptive TIN Ground Filter Parameters

LP360’s Adaptive TIN Ground Filter is designed to classify a ground surface from point data. There are multiple parameters within the filter, especially when using the Advanced Options. The following chart is a summary and general guidelines for setting the parameters.

Seed Sample Distance Grid size for initial seed surface. Smaller is more aggressive, higher fidelity, but more false ground points in initial surface.
Advanced Option: Angular Threshold (degrees) Maximum value at which a point will be added to the ground surface. Higher is more aggressive; typical is 4 – 10°.
Advanced Option: Maximum 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.
Advanced Option: Direction/Edge Control Turn on/off the algorithm for adding points along the edges of the triangles You generally want this unchecked. Check this option when you do not want objects such as railroad cross-ties and street curbs included in the Destination class.
Iteration Control Hard stop; no more points are added to surface after this point The process also stops automatically when no new points are added to the surface.

Higher is more aggressive; typical is 4-10.

Classify Only Seed Points to get a feel for the initial surface being generated from the chosen Seed Sample Distance.

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