Automatic dense point cloud classification finds points from the two classes: Ground and Low Points (that are under the estimated ground level). Manual classification allows to assign classes to the selected points.It's recommended to use default values in Classify Ground Points dialog, but they can be slightly varied depending on the project.Generally the method is the following: at first in every cell the lowest point is selected (Cell Size should be adjusted so that there are guarantied ground points in each cell). Then these points for each cell are triangulated in grid that should not be laying above the ground. Then new points are added to this grid - each of the points being added should match the following criteria:the distance between the point and the "ground surface" should not be bigger than Max.Distance parameter; the angles between the "ground" and the vectors connecting the point and vertices of the corresponding cells are not greater then Max.Angle parameter.Later in the Build Mesh dialog you can choose classes that should be used for mesh generation.
Topic: classify ground poins (Read 9357 times)
