Accuracy of Earthwork Calculations From Digital Elevation Data
Siyam, Youssuf Mustafa
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https://hdl.handle.net/2142/69897
Description
Title
Accuracy of Earthwork Calculations From Digital Elevation Data
Author(s)
Siyam, Youssuf Mustafa
Issue Date
1981
Department of Study
Civil Engineering
Discipline
Civil Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Civil
Abstract
Recent developments in photogrammetric methods, in general, and orthophoto mapping in particular, have resulted in the increasing availability of digital elevation data. The accuracy of digital elevation data generated from the orthophoto scanning process is usually below the level normally needed for earthwork calculations. However, the density and quantity of the elevation data from this source usually exceeds by many folds the coverage used in the conventional method of field or photogrammetric method of cross-section leveling. An investigation aimed at studying the effects of accuracy, density and distribution of gridded elevation data on the accuracy of earthwork calculations had been conducted.
Results from this investigation had clearly demonstrated that in earthwork calculations, the density and quantity of the data base can compensate for the decrease in data accuracy. More specifically, the elevation data generated from the orthophoto scanning process, can potentially be used to provide accurate volume measurements. Quantitative approach and general prediction formulas were developed to relate the reliability of volume determination with elevation accuracy, data spacing along the cross-section profile, distance between cross-sections, and the type of topography.
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