1. School of Geomatics and Urban Spatial Informatics Beijing University of Civil Engineering and Architecture Beijing 102616 China
2. Key Laboratory of Modern Urban Surveying and Mapping National Administration of Surveying Beijing 102616 China
3. Beijing Shenxin Reach Technology Co.,Ltd Beijing 102444 China
4. China Academy of Building Research Beijing 100013 China
5. CABR Testing Center Co.,Ltd Beijing 100013 China