Submitted on: 31 August 2005.
Revised on: 11 October 2005.
Accepted on: 02 December 2005.
___________________ISPRS JOURNAL OF PHOTOGRAMMETRY AND REMOTE SENSING
http://reply.papertrans.cn/2/147/14664/14664-32.png
http://reply.papertrans.cn/2/147/14664/14664-33.png
http://reply.papertrans.cn/2/147/14664/14664-34.png
http://reply.papertrans.cn/2/147/14664/14664-35.png
http://reply.papertrans.cn/2/147/14664/14664-36.png