Tellurometer Ground Swing on Geodetic Lines
Résumé
This paper presents a study of ground swing on tellurometer measurements of primary triangulation lines. Mainly discussed are the lines, comprising 8 % of the total, that have ground swings larger than 90 centimetres. The large ground swings are caused by reflections from steel observing towers, and from natural reflecting surfaces such as ice, water and land. The validity of theoretically computed ground-swing errors is discussed, as is the value of eccentric measurements, whose purpose it is to reduce ground swing and mean ground-swing errors. Estimates of actual ground-swing errors are made on the basis of comparisons between observed and adjusted lengths.Téléchargements
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Anders, F.J. and Byrnes, M.R.(1991). “Accuracy of shoreline change rates as determined from maps and aerial photographs”, Shore and Beach, 59, pp. 17-26.
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Foley, J.D., van Dam, A., Feiner, S. K. and Hughes, J.F. (1990), Computer Graphics – Principles and Practice, 2nd ed., Addison-Wesley, Reading, MA.
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Smith, A. (1988). Colour photomapping. Report NRC-01-512. National Research Centre. Ottawa, Canada.
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desJardins, M. (2005). How to succeed in postgraduate study, Applied Ecology Research Group, University of Canberra, viewed 26 April 2009, http://aerg.canberra.edu.au/jardins.t.htm.
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