Institute of Geographical Sciences and Natured Resou;
rces Research;
Chinese Academy of Sciences;
Beijing 100101;
P. R. China;
Department of Remote Sensing;
Birla Institute of Technology;
Ranchi 835215;
India;
Sinomaps Press;
Beijing 100054;
P. R. China;
Institute of Agricultural Resources and Regional Plaaning;
Chinese Academy of Agricultural Sciences;
Beijing 100081;
P. R. China;