alpha shapes算法用于三维大量数据的边缘检测，适合于三维激光扫描数据以及机载雷达数据，可以用于建筑物及其他地物的边缘检测。-alpha shapes algorithm for three-dimensional edge detection of large amounts of data, suitable for three-dimensional laser scan data, and airborne radar data, can be used for buildings and other surface features of edge detection.