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Lookup NU author(s): Dr Robert Tenzer
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Heights in Canada are defined in the system of orthometric heights, according to a method proposed by Helmert in 1890. However, much development in the theory of heights has been done since then, leading to a more rigorous definition of orthometric heights. The new definition takes into account the effects of terrain roughness, laterally varying anomalous topographical density, and the NT geoid-generated gravity disturbance, which are not considered in the Helmert method. This paper presents a calculation of corrections to Helmert orthometric heights, to update them to the more rigorous definition. The corrections for each effect, as well as a total correction comprising all three effects, are evaluated for a Canadian test area which includes several types of terrain. The correction is found to reach decimetres in some mountainous areas.
Author(s): Kingdon R, Vanicek P, Santos M, Ellmann A, Tenzer R
Publication type: Article
Publication status: Published
Print publication date: 01/01/2005
ISSN (print): 1195-1036
Publisher: Canadian Institute of Geomatics