jgg     2015 35 (6):  1046-1048    ISSN: 0412-1961  CN: 21-1139/TG A Unified Model for Cartesian Coordinate Transformations in  Two- and Three-dimensional Space 1 College of Geomatics Engineering, Nanjing Tech University, 30 South-Puzhu Road, Nanjing 211816, China 2 College of Ocean and Civil Engineering, Dalian Ocean University, 52 Heishijiao Street, Dalian 116023, China Received: 2014-09-25  Revised: null  Online: 2015-12-01 Supporting info