The Nation Geodetic Reference System which presents a consistent location standard used in creating a map or developing national land is defined and managed by the law in a nation. Each nation had used its own geodetic system created by astronomical surveying until recently, when Geodetic Reference System (World Geodetic Reference System) has been developed and used to progress in space and satellite geodetic technologies.
Korea also amended its geodetic law in December 2010, converting its national geodetic system whose reference an oval figure is Bessel ellipsoid into the World Geodetic Reference System which uses GRS80 ellipsoid as reference ellipsoid. Accordingly, the National Geography Information Institute improved law and systems related to the change for the effective conversion from its national geodetic system into the World Geodetic Reference System.
In addition National geographic information institute of the result of various studies is drawn th the World Geodetic Reference System for switching technology-met some of the institutional foundation Despite of accordance with for malities, National geographic information institute, Ministry of Land, Transport and Maritime Affairs and some local government of the World Geodetic Reference System and local government has or has not spread in public institutions.
Therefore, in order to promote the switch to the World Geodetic Reference System, it is required to analyze current technical and institutional problems and obstacles of the switch to the World Geodetic Reference System and to present the resolutions and to establish policy to achieve them.
The purpose of this study is to obtain seven parameter of coordinates transformation on cadastral control points in Jinju area. For this purpose, GPS surveying was accomplished using Trimble R7 receivers and Topcon Legacy receivers on the geodetic network which consist of twenty eight cadastral points and triangulation points in Jinju.
After data processing as like baseline analysis and network adjustment, final geographical coordinates referred to Bessel 1841 and GRS80 ellipsoid could be obtained.
Finally, seven parameter of coordinates transformation from local datum to global geodetic reference system of cadastal control points in Jinju area could be obtained by use of Molodensky - Badekas mathematical model of seven parameter is like below. The value of datum shift △x, △y, △z is -114.622m, 475.965m, 675.020m and the value of rotation parameter x, y, z aixs is -1.162m, 2.347m, 1.592m, respectively and the value scale factor is 1.000ppm.