Accuracy Analysis of Control Point Distribution for Different Terrain Types on Photogrammetric Block

Abstract

Since the digital orthoimage and orthomosaic maps have come to be used more and more as the fundamental basis for many studies, the demand for such products has been gradually increasing in the recent years. Owing to the fact that they can be produced more rapidly and cheaper than the traditional topographic maps, the orthoimage maps are currently much in demand. The production accuracy of the orthoimage maps, obtained through aerial photographs or satellite images, has been an important research topic. The number and distribution of the ground control points have a significant bearing on the accuracy of aerial triangulation. Therefore, the accuracy of the orthoimage maps, being the end products, is related to the number and distribution of the ground control points within the block. This study has aimed to study the influence of the number and distribution of ground control points and check points on the accuracy of aerial triangulation by using different GNSS/IMU systems. Five different configurations have been designed depending on the distribution of the ground control and check points within rectangular shaped blocks in different combinations and numbers. Such configurations were then tested in different types of terrain such as forest lands, residential and agricultural areas. The objective of the study was to identify the most ideal geodesic structure and the most accurate photogrammetric triangulation adjustment suitable for various different systems based on such terrain classification. The results were evaluated based on the ASPRS accuracy standards.

Synchronisation of Contactless Vibration Monitoring Methods

“…The results of the contactless vibration measurement methods used should be compared with each other, as presented in [15,17]. Recently, many authors [18][19][20][21][22][23][24][25] have dealt with the use and accuracy of GNSS-derived results and ground-based scanners and ground-based radar interferometry [26] in determining the dynamic response and in various types of object monitoring.…”