1. Key Laboratory of Agricultural Remote Sensing, Ministry of Agriculture/Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, China
2. Key Laboratory of Cultivated Land Use, Ministry of Agriculture and Rural Affairs, P. R. China, Chinese Academy of Agricultural Engineering, Beijing, China
3. Laboratoire des sciences de l'ingénieur, de l'informatique et de l'imagerie, University de Strasbourg, Illkirch, France