1. Institute of Forest Resource Information Techniques, Chinese Academy of Forestry,No. 2 Dongxiaofu, Haidian District, Beijing 100091, China. Key Laboratory of Forestry Remote Sensing and Information System, NFGA, No. 2 Dongxiaofu, Haidian District, Beijing
2. CHINA
3. Institute of Loess Plateau, Shanxi University, Taiyuan 030006, China