Italy **State Key Laboratory of Information Engineering / Kong Polytechnic University / Hong Kong §Zhengzhou Institute of Surveying / Wuhan University / Institute of Geodesy / /
Environmental Technology Department / Italy **State Key Laboratory of Information Engineering / Advanced Research Centre for Spatial Information Technology / Hong Kong §Zhengzhou Institute of Surveying and Mapping / Chinese Academy of Science / Department of Land Surveying and Geo-Informatics / Polytechnic University / Hong Kong / Institute of Geodesy and Geophysics / Wuhan University / Wuhan / / /