Exploring the stability of parameters of cameras internal orientation in an uinmanned aerial system and their inpatc on positional accuracy of products

摘要

Unmanned aerial systems are increasingly used in geodesy and thus more and more advanced. The wish to achieve higher accuracy of photogrammetric products, which result from complex bundle block adjustments and multi-image matching, raises the question of stability of parameters of the digital camera’s internal orientation in the aerial vehicle and their impact on the final product. The Bramor rTK aerial vehicle by the company C-ASTRAL and the Agisoft PhotoScan photo processing software were used for the purpose of this thesis. A geodetic network consisting of 20 stabilised points was established at the Petrol petrol station in Vipava to provide a calibration field. The network was condensed with a polar method to obtain more control points. To determine the stability of parameters of the camera’s internal orientation, we conducted flights above the calibration field on three occasions. On every occasion, we carried out two flights, each at a different altitude, following the same flight plan. The acquired pictures were loaded to the Agisoft PhotoScan software, where internal and external camera orientation parameters were calculated through bundle block adjustments. The changing internal orientation parameters were analysed based on tests performed on different test blocks. The impact of the said parameters on the accuracy of photogrammetric products, i.e. orthophotos and point clouds, were assessed in line with control point discrepancies that were measured on the products using the Autocad Civil 3D software. Moreover, the discrepancies of the products on control points using different numbers of Ground Control Points were also observed.