|
|
|
3D Coordinate Measurments of Dam by Close Range Photogrammetry
Alireza Shirkhani
K.N.Toosi University Of Technology,
Email: alireza.shirkhani@yahoo.com
Masoud Varshosaz
Department of photogrammetry & Remote sensing, K.N Toosi Unoversity of Technology
Email: varshosazm@kntu.ac.ir
Mohammad Saadat seresht
Center of Ecellence for Geomatics Engineeing and Disaster Management, Tehran University
Email: msaadat@ut.ac.ir
Recent years have been an increase in the use of digital close range photogrammetry in various engineering projects.by using high resoulution cameras along with a proper network design, camera calibration and bundle adjustment, measurments of high accuracy can be achieved. In this paper the application of photogrammetry in 3D coordinate measurements of large dams is studied.for this a larg concrete dam (245.7m by 62.8m), named Marun,which is located in south of iran was considered as the case study
A number of targets were fixed to dam body and imaged using high resolution (8 mega pixel) digital camera.various tests were carried out to evalutae the capability of photogrammetry in 3D measurments of the target points.
the results indicated that within the experimental configurationsEan accuracy of 1.88 mm could be achieved.The study however, showed that due to comlex and difficult conditions surrounding such dams,it is not always possible to use photogrammetry alone in dam 3D point measurements.Photogrammetry can,therefor be used at least in combination with surveying techniques especially when a fast and not necessarily too accurate analysis is requaired
|
|
|