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Applying the Close Range Photogrammetry to Study the Effect of Control Point Location on Rut Depth Measurements


Dr. Tarek A. H. El-Damaty[1] , Prof. A.M. Ibrahim[2]
Page No. 22-37


Abstract

The science of photogrammetry deals with extracting quantitative and qualitative data
(coordinates, lengths, and shapes) on the earth's surface using photographs. This technique has the
advantage of saving the resources. If the site is photographed by a pair of overlapped photographs,
and the image coordinates of points in the overlapped area are measured, then these coordinates
can be used to calculate the ground coordinates.This paper investigates the use of cat's eye points
as control points for rut depth measurements. Four highway sites were selected; each site was
prepared and videotaped by stereo-pair cameras mounted on the back of vehicle travelling at
speeds of 20, 40, 60, and 80 km/h. The study concluded that, the cat's eye points can be used as
control points in close range photogrammetry.
Keywords: close range photogrammetry, control points, rut depth, measurements.


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