'Periodica Polytechnica Budapest University of Technology and Economics'
Abstract
The methodological analysis of the author was motivated the fact that his team could
apply its GPS techniques directly by using an existing geoid map (GAZSÓ, TARASZOVA,
1984). Regarding the Hungarian particularities, he analysed the sensitivity of the de-
termination of elevations above sea level by applying GPS methods to the knowledge of
geoid heights. He pointed out the possibility that a 7-parameter transformation of spatial
coordinates can provide automatically a linear elevation fitting. To make a global approx-
imation to the geoid in Hungary, he derived a third-degree formula with two variables by
means of Chebyshev approximation
