Abstract
At present, the classical height systems in S o uth America are realized by first order leveling networks, which refer to the mean sea level determined at local tide gauges. The sea surface variations and the neglect of the gravity effects in the height processing generate discrepancies between the different height systems. The connection of the leveling networks of Colombia, Ecuador and Venezuela performed on the occasion of the SIRGAS 2000 GPS campaign shows considerable discrepancies in the heights (exceeding 30 cm) of the three national classical reference systems. Since the principal requirement of a unified vertical reference system is a common reference surface, the gravimetric geoid/quasigeoid computation for Colombia (GEOCOL2001) was extended to the mentioned area. The resulting height anomalies are compared with the existing spirit leveling data and GPS heights. The discrepancies are -20 cm between Colombia and Ecuador, and they range from -53 cm to +49 cm along the Colombian-Venezuelan border.
Presently at Institut für Planetare Geodäsie, Technische Universität Dresden
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Sanchez, L. (2002). A Reference Surface for the Unified Height System in the Northern Part of South America. In: Ádám, J., Schwarz, KP. (eds) Vistas for Geodesy in the New Millennium. International Association of Geodesy Symposia, vol 125. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-04709-5_15
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DOI: https://doi.org/10.1007/978-3-662-04709-5_15
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