History of precise levelling in Canada and the North American vertical datum readjustment

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dc.contributor.advisorAnderson, Edward G.
dc.contributor.authorGareau, Rene M.
dc.coverage.spatial2000001092en
dc.date.accessioned2005-07-21T19:37:08Z
dc.date.available2005-07-21T19:37:08Z
dc.date.issued1986
dc.descriptionBibliography: p. 194-203.en
dc.description.abstractIn 1977, the Canadian Geodetic Survey in cooperation with the United States National Geodetic Survey started on the readjustment of North American geodeticvertica networks on a redefined datum. This project has been assigned the title of 1988 North American Vertical Datum (NAVD88). This colossal task requires studies of (NAVD88) technical problems associated with the type and the amount of data involved. It also requires the automation of the levelling data. This thesis is in two parts. The first part is a synthesis of the precise levelling work in Canada since its beginning, in 1883, until today. Precise levelling was started in 1883 by the Department of Public Works (1883-1930), followed by the Geodetic Survey in (1906-present) and then by Topographical Survey in (1912-1925). The second part deals with the errors associated with the levelling work. It describes the errors and their effect on the levelling data. Numerical tests show that the precision of levelling, for first order in southern Canada, has improved from a standard deviation of the mean of 1.36 mm to 0.63 mm/km and the percentage of relevels has been reduced from 17. 4 to 5. 3 in recent years. But there are still the systematic errors which required further investigations. The author believes that such basic information will help to improve the quality of the NAVD88 adjustment. It is hoped that the recommendations will be the springboard to fruitful research related to this project. This information should also be a great asset in the automation of the levelling data especially with regard to the type of data to be automated and analyzed.
dc.format.extentxiii, 216 leaves : ill., maps ; 30 cm.en
dc.identifier.citationGareau, R. M. (1986). History of precise levelling in Canada and the North American vertical datum readjustment (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/13809en_US
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/13809
dc.identifier.isbn0315326492en
dc.identifier.lccTA 607 G35 1987en
dc.identifier.urihttp://hdl.handle.net/1880/21604
dc.language.isoeng
dc.publisher.institutionUniversity of Calgaryen
dc.publisher.placeCalgaryen
dc.rightsUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.
dc.subject.lccTA 607 G35 1987en
dc.subject.lcshLeveling - Canada - History
dc.subject.lcshSurveying - Canada
dc.titleHistory of precise levelling in Canada and the North American vertical datum readjustment
dc.typemaster thesis
thesis.degree.disciplineCivil Engineering
thesis.degree.grantorUniversity of Calgary
thesis.degree.nameMaster of Science (MSc)
ucalgary.item.requestcopytrue
ucalgary.thesis.accessionTheses Collection 58.002:Box 582 215772185
ucalgary.thesis.notesoffsiteen
ucalgary.thesis.uarcreleaseyen
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