Photogrammetric Systems for the Analysis of Planar Displacements in Soil
Vonderohe, Alan Paul
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https://hdl.handle.net/2142/66895
Description
Title
Photogrammetric Systems for the Analysis of Planar Displacements in Soil
Author(s)
Vonderohe, Alan Paul
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
Language
eng
Abstract
Engineering testing of soils and soil models often involves the measurement of planar displacements in cross-sectional areas. Photogrammetric techniques provide high-density, global information. This thesis is intended to assist prospective users in the design of photogrammetric systems for this purpose. A mathematical model which accounts for camera orientation and its changes was developed. Included in the model are corrections for refraction by the glass plate through which the soil was photographed and deviations of that glass plate from a plane. A computerized simulator was developed and used to quantify the effects of errors in system parameters. A comparison between the achievable accuracies of metric and non-metric cameras was made. Optimal control requirements for each are stated.
Results from applications in two separate research projects are presented. The accuracy of these results was assessed through the analysis of residuals at check points and through comparisons of direct measurements. Computer graphics were developed for the display of displacement and strain information. Design considerations are stated along with procedures for determining the refractive index and the warping of the cross-section from a plane.
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