CGRG Bibliography of Canadian Geomorphology
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Author : Cowan, L.E.
Date : 1995.
Title : Surface roughness measurement of an inter-tidal zone using close range non-metric photogrammetry
Publication : Unpublished thesis. University of New Brunswick
Issue :
Page(s) : 104 p.
Abstract
Geomorphology studies the processes which act on the Earths' surface altering its topology. Traditionally, measurements had been taken with survey instrumentation. It is proposed here that close range|photogrammetry offers an alternative method to surface measurements. Here a digital terrain model was produced as a surface roughness indicator. A non-metric photogrammetric system was designed and implemented in this project to assess the potential accuracy and usability of the system to measure a beach area of 5 metres by 5 metres. Non-metric cameras were used in preference to the traditional metric cameras as they offered the|advantages of reduced cost, ease of use in terms of weight, size, and familiarity, and superior resolutions. Their accuracy, however, can only be compared to that of metric cameras if the large lens and film|distortions are removed through modeling.||In this project a height tolerance band for data collection was set at 1.5cm. The resulting elevation accuracy was 10.85mm. With a reduced band|the elevation accuracy of the system could be increased to 7mm. This result proves that the used of non-metric close range photogrammetry|should be considered in geomorphological applications, and the use of metric cameras in todays operations may be unnecessary expense.
Bibliography of Canadian Geomorphology