Nave, Jerry W.; Ali, Tarig A.
March 2012
Technology Interface International Journal;Spring/Summer2012, Vol. 12 Issue 2, p23
Academic Journal
Localization is performed to fit the observed GPS positions to the local datum at the survey site. Mathematically, localization is a coordinate transformation between the GPS and local systems. When RTK techniques are used for topographic mapping, localization is crucial as it adjusts observed GPS ellipsoid elevations to the local vertical datum, thus accounting for geoid undulations. Localization uses a set of coordinates of points in both WGS-84 and the local coordinate system. Commonly, the number of points that can be used in localization depends on the size of project area and the type of the adopted GPS hardware and/or software. These points should be well distributed in the project area. One measure of the quality of localization is the maximum values of horizontal and vertical residuals, which depend on the accuracy of the GPS-derived coordinates of the points. In this paper, the authors present the requirements for robust localization and addresses some related issues.


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