Affiliation: | 1.Institute of Surveying and Mapping, Information Engineering University, Zhengzhou 450052, China;Naval Institute of Hydrographic Surveying and Charting, Tianjin 300061, China2.Naval Institute of Hydrographic Surveying and Charting, Tianjin 300061, China3.Institute of Surveying and Mapping, Information Engineering University, Zhengzhou 450052, China |