Group planar surfaces
Not Lite
Planar surfaces grouping command assigns a group number to points fitting to the same plane.
This grouping method can be used, e.g., to identify points representing building components like walls and roof patches.
The group assignment relies on the distance from ground value and normal vector information. Both must be computed for the points before the command is started. Use Compute distance command for loaded points or Compute distance macro action with setting Distance: To ground class in order to compute the distance value. Use Compute normal vectors command for loaded points or Compute normal vectors macro action in order to compute normal vector directions.
SETTING |
EFFECT |
|---|---|
Class |
Point class(es) included in the search for groups. |
|
Opens the Select classes dialog which contains the list of active classes in TerraScan. You can select multiple source classes from the list that are then used in the Class field. |
Current groups |
Determines how current group numbers of points are handled: •Clear - existing group numbers are deleted before assigning new numbers resetting the old grouping. •Keep - existing group numbers are kept continuing the previous grouping. |
Use color |
If on, color values assigned to the points are used for grouping. The Weight of color values is determined by the given percentage value. |
Tolerance |
Determines how much points may differ from a plane. Point that are within the given vertical distance from a plane are grouped. This is active only if Group planar surfaces is switched on. |
Min area |
Minimum area of a planar surface for grouping points. This is active only if Group planar surfaces is switched on. |
Min height |
Minimum height above ground of a planar surface for grouping points. This is active only if Group planar surfaces is switched on. |
Planar surface extraction is typically more strict in group creation than By tree logic and By density automatic grouping actions. Thus, this routine is typically run before the others, when combining multiple grouping routines in a macro.
