I would like some detail in regards to how the Pix4D classification process identifies and sorts features into their respective point cloud class. For example, does the classification process use only color to identify brush and grass for the High vegetation class? Does it only use height to separate perceived building features from the rest of the point cloud for the building class? Finally, does it use flat, asphalt colored features at ground level in order to identify road surface features? I read that color and geometry does help the classification process figure out what class point features will be classified as, but is there something else being done behind the scenes to help create the point features classes?