Geometric Correction and Error Analysis of Close-Range Photogrammetry Without Ground Control Information
Date Issued
2011
Date
2011
Author(s)
Chuang, Pi-Hua
Abstract
Close range photogrammetry(CRP), has become an accepted, powerful and readily available technique for engineers and scientists who wish to utilise images to make accurate 3-D measurements of complex objects. Traditional CRP requires establishment of good ground controls to guarantee high precision. Photos with control points are taken, and exterior orientation parameters(EOPs) of camera exposures are solved by perspective geometry. Then, the position, shape and size of the object in three dimentional space were got by means of intersection.Compared with other surveying tools, traditional surveying need operators carry heavy instruments, but CRP can reduce the inconvenience caused by this. Besides, in disaster management, it is usually hard for people or vehicles to reach the disaster scenes, or we cannot find corresponding satellite images. Thus, we will use non-control point CRP as a basis.
In this paper, we illustrate the procedureal strategy under no ground control point information and compare the process with the normal CRP case. We consider three forms of control information: ground control points, control cameras, and geometric elements. By means of analysing simulated data and real data, we have tested the feasibility of our proposed method. The result shows the EOP precision is not consistent with the existence of control points. But with the control points information, we may get more accurate 3D position with both the same reliable precision. As for the control constraints, they indeed can improve the EOP precision under no control point CRP case, but they increase the precision of object point coordinates with limits.
Subjects
close range photogrammetry
geometric correction
direct geo-referencing
disaster prevention
Type
thesis
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