1. School of Surveying and Geo-Informatics, Shandong Jianzhu University, Jinan, Shandong, China;
2. The Key Laboratory of Digital Simulation in Spatial Design of Architecture and Urban-Rural, Shandong Provincial Education Department, Jinan, Shandong, China
3. Shandong Geographical Institute of Land Spatial Data and Remote Sensing Technology Center, Jinan, Shandong, China
4. School of Geosciences and Info-Physics, Central South University, Changsha, Hunan, China