作者单位:CHEN Jian-ping,YAN Qiong,SHANG Bei-chuan,WU Zhao(Institute of Land Resources and High Techniques,China University of Geosciences(Beijing),Beijing 100083,China;Beijing Key Laboratory of Development and Research for Land Resources Information,Beijing 100083,China)陈建平,严琼,尚北川,武曌(中国地质大学(北京)国土资源与高新技术研究中心,北京 100083;北京市国土资源信息研究开发重点实验室,北京 100083)