Evaluation of the Direct UTM Coordinates Transformation Method Based on the Standard 7-Parameters Transformation  

作　　者：Mohammed Anwer Jassim Darin Mohammed Tofiq Mohammed 

机构地区：[1]Geomatics Engineering Department,College of Engineering,Salahaddin University-Erbil,44 Iraqi Kurdistan Region,Iraq

出　　处：《Journal of Civil Engineering and Architecture》2022年第8期413-419,共7页土木工程与建筑（英文版）

摘　　要：GNSS(global navigation satellite system)observations produce the geodetic position including latitude,longitude,and altitude(or ellipsoidal height)concerning the global reference datum WGS84(Word Geodetic System 1984),which usually should be converted to another local datum to get the desired position meaning in a physical sense,coordinates of points in the local datum are usually calculated by the seven-parameter transformation method.This paper aims to validate the methods of position transformation between WGS84 and the Iraqi local datum Karbala 1979 using the UTM(universal transverse Mercator)projected coordinates directly.The proposed algorithm was tested for 10 ground control points in Erbil city and many selected points in other different cities over all Iraqi territory.The control points are measured by the CHCNAV i73 GNSS receiver.For the evaluation procedure,the RMSE(root mean square error)of the transformed coordinates is calculated with an average value of±10.715 m as an estimated uncertainty of the direct UTM coordinates transformation method over Erbil city territory,and more than±12 m over different places over Iraqi territory.

关 键 词：Direct UTM coordinates transformation global datum WGS84 local Iraqi datum Karbala 1979 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]