1. Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, the Key Laboratory for Land Satellite Remote Sensing Applications of Ministry of Natural Resources, the Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, and the the School of Geography and Ocean Science, Nanjing University, Nanjing, China
2. School of Geographic and Biologic Information, Nanjing university of Posts and Telecommunications, Nanjing, China