Classify Ground by Selected
Due to the complex and varied terrain of point cloud data, it is often difficult to achieve good classification results using a set of parameters when using Classify Ground Points, especially for the mixed areas (mountains, plains, etc.). This function can reclassify the ground points in the unsatisfactory area.
First load the data in the window. Click Classify > Classify Ground by Selected, the classification toolbar appears at the top of the data window, as shown below.
From left to right: polygon selection, rectangle selection, sphere selection, subtract selection, clear selection, classify by attribute, conicoid Filte, slope filter, TIN filtering, extract median ground points, recover selection, and exit.
Brief: Using method see point cloud selection tool Polygon Selection.
Brief: Using method see point cloud selection tool Rectangle Selection.
Brief: Using method see point cloud selection tool Sphere Selection.
Brief: Using method see point cloud selection tool Subtract Selection.
Brief: Clear selected point cloud area.
Classify by Attribute
Brief: Using method see classification tool Classify by Attribute.
Brief: Using method see classification tool Conicoid Filter.
Brief: Using method see classification tool Slope Filter.
Brief: Using method see classification tool Classify Ground Points.
Extract Median Ground Points
Brief: Using method see classification tool Extract Median Ground Points.
Brief: Restore last selected point cloud area.
Brief: Exit this tool bar.
Note: The ground point classification algorithms provided by the selected area point classification include: Conicoid Filter, Slope Filter, and TIN Filter. Different methods should be chosen according to the terrain. Generally, the effect of TIN filter is the most stable and therefore we recommend this first. In addition, it would be better to handle each file seperately.