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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
Journal: Geomatica
Year: 2005
Volume: 59
Issue: 3
Pages: 241-249
Print publication date: 01/01/2005
ISSN (print): 1195-1036
ISSN (electronic):
Publisher: Canadian Institute of Geomatics
URL: http://www.scopus.com/record/display.url?eid=2-s2.0-28444494066&origin=resultslist&sort=plf-f&src=s&st1=Toward+an+improved+orthometric+height+system+for+Canada&sid=8spwDFqGZxHBJ8haXDwS1JT%3a30&sot=b&sdt=b&sl=70&s=TITLE-ABS-KEY%28Toward+an+improved+orthometric+height+system+for+Canada%29&relpos=0&relpos=0&searchTerm=TITLE-ABS-KEY%28Toward%20an%20improved%20orthometric%20height%20system%20for%20Canada%29
