Classify Ground

Source classes

The classes that will be involved in the ground classification. Points of other classes are not subject to reclassification. The list opened by button , displays all classes of the current point cloud.

Ground class

The destination class, which should be assigned to recognized points of the ground. The destination class should coincide with none of the source classes, otherwise the command will stop ahead of time with an error message in the command line.

Cell size

Set the length of square cells which will split the area of point cloud (clouds). The smaller value is, the more precisely relief elements are displayed. Value should be more than 0.

Maximum window size

Size of artificial objects (buildings, cars, etc.) which doesn’t belong to ground. Objects are removed out of classification. Value should be larger than cell size.

It is necessary to find the widest low object and measure a half of its shorter side, increasing the resulting value by 20 percent. For each cloud the parameter should be set manually in the units of drawing. Correctly measured parameter Maximum window size is always larger than the Cell size parameter.

Terrain angle, degrees

Maximum angle of slope in degrees relative to XY plane in WCS. It can be measured at some characteristic area. Points on surfaces that exceed this angle will not be classified as ground surface points. Should be in the range from 0 to 90.

Iteration angle, degrees to plane

Maximum angle of deviation of local irregularities from the main direction of the ground surface.

Maximum distance

Maximum distance above the ground surface, above which points will not participate in the classification process and, therefore, will not be classified as ground points. The distance is specified in the units of drawing.

Save ground model

In addition to ground surface classification, the command allows you to automatically construct its triangulation model as a mesh object. Select Yes to keep generated TIN in the drawing after the end of the command.

Unlike the TIN created with the Create TIN, command, this mesh is created with optimized edges. TIN can be optimized later with the Mesh Simplification command.

Classify vegetation

Classification of points (vegetation) by height above ground level. Set Yes for the Classify vegetation option, additional parameters will appear.

These parameters are similar to the parameters of the Vegetation by Height command and described in the description of this command.

Class

Destination class for the low, medium or high vegetation.

Height

Height level for the low, medium or high vegetation in drawing units.

Apply changes? <Yes> or [Yes/No/Save/saveDefault] <Yes>:

Yes – the command will be performed taking into account changes in the settings made by the user in the current session of the command work.

No – the command will be performed with the settings displayed immediately after running the command.

Save – saving settings to a document.

saveDefault – saving settings to the registry.