Context of Remote sensing of the environment : 15th National Symposium on Remote Sensing of China : 19-23 August, 2005, Guiyang City, China, Qingxi Tong, Wei Gao, Huadong Guo, chairs/editors ; organized by Association on Environment Remote Sensing of China ... [et al.] ; sponsored by State Key Laboratory of Remote Sensing Science (China) ... [et al.] ; cooperating organizations, SPIE--the International Society for Optical Engineering ... [et al.] ; hosted by Institute of Remote Sensing Applications, CAS (China) ... [et al.] ; supporting organizations Image Info Co. Ltd. (China) ... [et al.], (electronic book)