Digital terrain modeling : principles and methodology / Zhilin Li, Qing Zhu, and Chris Gold. Li, Zhilin, 1960- Zhu, Qing, 1966- Gold, Chris, 1944- Digital mapping Methodology. GA139 .L5 2005 526 22 LID Includes bibliographical references and index. New York : CRC Press, c2005. c2005. 2005 Text xvi, 323 p. : http://www.loc.gov/catdir/enhancements/fy0646/2004054578-d.html eng