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Abstract
A common problem faced by most countries is the estimation of precise transformation parameters between their national geodetic datum, and the World Geodetic System 1984 (WGS84) global datum, used by the Global Positioning System (GPS). In this study, a coordinate transformation package has been developed for this purpose, under UNIX environment, using the C programming language. It is capable of estimating the seven transformation parameters between any two geodetic datums, and transforming geodetic coordinates from one geodetic datum to another. The software offers the option to transform the coordinates of a single point interactively, or to transform the coordinates of any number of points, listed in an input file. It is primarily designed to perform the seven parameter Helmert transformation from WGS84 / EURopean REference Frame (EUREF) to EOV (Hungarian National Frame), in Cartesian coordinates. It uses a database of geodetic points, for which the Cartesian coordinates are known in both the systems. The program uses the principle of least square adjustment, to estimate the transformation parameters. This work has been carried out at the FOMI Satellite Geodetic Observatory, Penc, Hungary. However, the software can also transform coordinates between any other geodetic datums, provided that the necessary database of points is available. The details of the software, and results obtained using test data, are presented in this paper. This software has also been used for the estimation of transformation parameters in the Bhuj region, and the results of this transformation have been presented in this paper.