1. Z.G. Chen, Pub. Sec. Sci. J. -J. Zhejiang Pol. Coll., 1 (2009), 74-78.
2. J.F. Chen, Introduction to geographic information systess, Tsinghua University Press, Bei Jing( 2003).
3. J.B. He, E.S. Zhong, Acta geograph. sinica, 3 (1993)84-90.
4. W.H. Chen, B. Feng, D.Y. Li, Fishery Econ. Res., 1 (2005) 40-45.
5. X.D. Mu, Geomatics Tech. Equ., 2 (2006), 36-38.