What are the limitations (memory or otherwise) when using point clouds to make a terrain? I have been furnished with 5000'-square tiles of LIDAR data that when all combined to cover my subject area contain approximately 208 million points and 64 tiles. I have not been able to add all of the tiles to a single terrain. Is there a way to do this? I have briefly looked into MicroStation, GEOPAK SS4, PointTools, and Descartes.