FIG Peer Review Journal


The Calculation and the Programming of the Geoid Undulations by Using the Orthogonal Polinoms (2918)

Fuat Basciftci and Cevat Inal (Turkey)
Mr. Fuat Basciftci
University of Selcuk
Selcuk University, Kadinhani Vocational School of
Higher Education Mapping-Cadastre Programme
Corresponding author Mr. Fuat Basciftci (email: fuatbasciftci[at], tel.: +90 332 8340306)

[ abstract ] [ paper ] [ handouts ]

Published on the web 2008-03-21
Received 2008-01-31 / Accepted 2008-03-14
This paper is one of selection of papers published for the FIG Working Week 2008 in Stockholm, Sweden and has undergone the FIG Peer Review Process.

FIG Working Week 2008
ISBN 978-87-90907-67-9 ISSN 2307-4086


The use of GPS in all kinds of engineering applications for determining precise coordinates, especially in the last ten years, has made fundamental changes in Turkey as in the other countries. 3-D precise coordinates, easily obtained by GPS, are widely used in such applications as large scale map production and Geographical Information System. The latitude and longitude obtained by GPS are used directly as they are or after suitable transformations, but ellipsoidal heights can not be used in applications. For the transformation from ellipsoidal heights to orthometric heights, which are used in applications, geoid heights must be known with required accuracy. In this study a programme which is prepared in DELPHI language named TRANSFORMATOR to determine the undulation of the geoid for it’s based point by using orthogonal polinoms.By this programme the undulation of the geoid of the remaining points in the area could be computed by the usage of the X,Y coordinates and the undulation of the geoid.
Keywords: GNSS/GPS; Engineering survey; Ellipsoidal height, Orthometric height, geoid