The Application and Comparison of Digital Ground Photogrammetry Technology for Bridge Safety Monitoring

Abstract

For needs of transportation, it is more and more obvious of the bridge unsafe, and the study of bridge safety monitor will become more important at the area of civil engineering. In this paper we discuss the methods of digital ground photogrammetry for bridge safety monitoring and the application of those, we took digital cameras and 3-D laser scanners as the tools for close-range photogrammetry, and adopted 3D Time Baseline Parallax combined with Kalman Variance Filters as the theories for monitoring dynamic deformation, then developed software to deal with data, which can draw curves of dynamic deformation automatically, we can monitor the deformation regularity by these curves effectively, then we can monitor and analysis the safety of bridges by this way. The method we designed is very simple and economical, and we also did a lot of experiments to verify availability of this system, and we happy to say that the system has the characteristics of high automation degree, large data collection capacity and strong system reliability, etc. It will be practical value at the area of civil engineering.

Real-Time Monitoring Deformation of Building Using Photography Dynamic Monitoring System

“…Because coordinates of control points are barycentric coordinates, ∑ ∑ = 0 and the parallax coefficient in the direction as Equation (16) shows:…”

“…The photogrammetry technique falls into the second group and leverages rays of light that are reflected from a structure [9]. Some scholars have successfully applied photogrammetry technology to the deformation monitoring of engineering structures such as steel structures [15], bridges structures [16], regulating sluice structures [17], and shuttle steel shelves [18]. The DLT (direct linear transformation) method and the MP (motion parallax) method are two conventional methods used to obtain the deformation of the monitoring points.…”

A New Camera Calibration Method Based on Orientation Points in Digital Close-Range Industrial Photogrammetry

“…Currently, it is widely applied in manufacturing, aerospace, urban planning, etc. [1][2][3].As one of the key steps of photogrammetry technology, camera calibration directly affects the final measurement results [4,5]. Existing calibration methods (such as Zhang Zhengyou calibration method) mainly based on the checkerboard mode [6,7].…”