1. Key Laboratory of Virtual Geographic Environment (Ministry of Education of PRC), the State Key Laboratory Cultivation Base of Geographical Environment Evolution (Jiangsu Province), and the Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing Normal University, Nanjing, China
2. School of Transportation and Geomatics Engineering, Shenyang Jianzhu University, Shenyang, China
3. Department of Land Surveying and Geo-Informatics, The Hong Kong Polytechnic University, Hong Kong, China