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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Mohammed Anwer Jassim and Darin Mohammed Tofiq Mohammed
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DOI:10.17265/1934-7359/2022.08.003
Geomatics Engineering Department, College of Engineering, Salahaddin University-Erbil, 44 Iraqi Kurdistan Region, Iraq
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.
Direct UTM coordinates transformation, global datum WGS84, local Iraqi datum Karbala 1979.
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