1. School of Geomatics and Urban Spatial Information, Beijing University of Civil Engineering and Architecture, the Beijing Key Laboratory of Urban Spatial Information Engineering, the Key Laboratory for Urban Geomatics of National Administration of Surveying, Mapping and Geoinformation, Beijing, China
2. School of Geomatics and Urban Spatial Information, Beijing University of Civil Engineering and Architecture, Beijing, China
3. Beijing Institute of Surveying and Mapping, Beijing, China