Simple, powerful and inexpensive CAD software for surveying. You can do triangulation, isolines, color-filled contour maps, sections, intersections, volume, editing XYZ files and much more. You can represent 4D points cloud and process hundreds of thousands of points or triangles, even on less powerful PCs. You don't need another CAD system. RTOPO has its own CAD system. RCAD graphic core, distributed together with RTOPO, provides OpenGL real-time orbit, pan, zoom, shading, lighting and motion path animation. It does not contain hydrology.