5Jay Lee. Comparison of existing methods for building triangular irregular network models of terrain from grid digital elevation models[J].International Journal of Geographical Information System, 1991, 5 (3) : 267 - 285.
6Tsai V J D. Delaunay triangulation in TIN creations: An overview and a linear time algorithm[J].International Journal of Geographical Information System, 1993, 7 (6) : 501 - 524.
7Antenucci John, Brown Kay, et al. Geograhic Information System-A Guide to Technology[M] Newyork: Van Norstand Reinhold, 1991.