APCRS-2020-0004
AUTHOR(S):
Krystian Pyka, Paweł Wiącek, Mirosław Guzik
TITLE:
SURVEYING WITH PHOTOGRAMMETRIC UNMANNED AERIAL VEHICLES
ABSTRACT:
The paper presents how to carry out measurements with UAV in order to meet the requirements set for geodetic measurements by Polish technical regulations. First, a review of literature focused on the influence of various factors shaping the accuracy of photogrammetry with UAV was made. Then, on the basis of the author’s experience, a number of recommendations constituting a set of good practices in planning, taking photographs with UAV and their processing and final measurement
were formulated. Key elements of the method, such as image coverage, number and distribution of GCP (ground control point), balanced aerotriangulation alignment, methods for measuring field details, the extent to which orthomosaics and point clouds are used as survey material, were identified. It was found that careful observance of the given rules makes photogrammetry with UAV usable as a method of situation and elevation measurements. At the same time, it was pointed out that special care
should be taken when measuring building contours. In this case, stereo or mono measurement on multiple images was indicated as the appropriate method. Orthomosaic measurement was recommended for field details visible without obscuration on all photographs covering a given fragment, and for details requiring less accuracy than buildings.
KEY WORDS: UAV, bundle adjustment, orthomosaic, stereo, point cloud
DOI: https://doi.org/10.14681/apcrs.2020.0004