Assesment of the Influence of Uav Image Quality on the Orthophoto Production

Abstract

Commission ICWG I/VbKEY WORDS: Photogrammetry, Unmanned Aerial Vehicle, Bundle Block Adjustment, Image Quality, Point Cloud ABSTRACT:Over the past years a noticeable increase of interest in using Unmanned Aerial Vehicles (UAV) for acquiring low altitude images has been observed. This method creates new possibilities of using geodata captured from low altitudes to generate large scale orthophotos. Because of comparatively low costs, UAV aerial surveying systems find many applications in photogrammetry and remote sensing. One of the most significant problems with automation of processing of image data acquired with this method is its low accuracy. This paper presents the following stages of acquisition and processing of images collected in various weather and lighting conditions: aerotriangulation, generating of Digital Terrain Models (DTMs), orthorectification and mosaicking. In the research a compact, non-metric camera, mounted on a fuselage powered by an electric motor was used. The tested area covered flat, agricultural and woodland terrains. Aerotriangulation and point cloud accuracy as well as generated digital terrain model and mosaic exactness were examined. Dense multiple image matching was used as a benchmark. The processing and analysis were carried out with INPHO UASMaster programme. Based on performed accuracy analysis it was stated that images acquired in poor weather conditions (cloudy, precipitation) degrade the final quality and accuracy of a photogrammetric product by an average of 25%.

Chosen Aspects of the Production of the Basic Map Using Uav Imagery

“…For Trimble UX5 platform pictures are taken with a super bright Voigtlander lens with 15 mm focal length and the maximum aperture equal F4.5. (Wierzbicki et al, 2015)…”

“…The most popular programs processing the low-ceiling photogrammetric data are INPHO UASMaster, Pix4D, AgiSoft Photoscan and EnsoMosaic.. The test block was adjusted in INPHO UASMaster software (Wierzbicki et al, 2015).…”

Kortowo Test Field for Testing Photogrammetric Products Accuracy – Design and First Evaluation

“…A thorough calibration of the camera system mounted onboard UAV platforms is very important and is performed most often in the laboratory using a small volumetric test field and planar pattern (Hastedt, Luhmann, 2015) or the 3D test field (Oniga et al, 2018), which consists spatially distributed, coded and non-coded targets (Cramer et al, 2017). In the data collection or mapping case, the test fields are mainly characterized by a small area and homogeneous surface (Eling et al, 2015) or also topographical differentiated terrain (Cramer et al, 2017;Wierzbicki et al, 2015), with evenly located ground control points (GCPs) and check points (ChPs). Due to the limited scope of field surveys, the used approaches usually had a small number of GCPs and ChPs (Barry, Coakley, 2013;Saponaro et al, 2019;Wierzbicki et al, 2015).…”

“…In the data collection or mapping case, the test fields are mainly characterized by a small area and homogeneous surface (Eling et al, 2015) or also topographical differentiated terrain (Cramer et al, 2017;Wierzbicki et al, 2015), with evenly located ground control points (GCPs) and check points (ChPs). Due to the limited scope of field surveys, the used approaches usually had a small number of GCPs and ChPs (Barry, Coakley, 2013;Saponaro et al, 2019;Wierzbicki et al, 2015). The test fields with an area of several square kilometers and varying terrain elevation and topography, as well as dense GCPs network, requiring a large number of surveys, are in practice very rarely realized.…”

Analyze Angle of the Camera Payload LSU-02 in Mission of Aerial Photo

“…The aerial mapping technique with photogrammetric approach using UAVs with low cost spatial data collection has been carried out (Muneza J. Maurice, et al) [1]. Several aerial photography techniques have been used by using UAV technology and some applications: UAV stabilization techniques during flight by maintenance of a constant speed, maintenance of a straight line of flight and the reduction of tilt (Volodymyr Hlotov et al, 2015) [2]; Oblique photogrammetric system by integrating a cheap doublecamera imaging system designed to acquire images with ground resolutions better than 3 cm has been conducted by San Jiang et al, 2017 [3], [9]; the methodology for the determination of mapping costs is developed and the example of efficiency evaluation is presented which is based on the photogrammetric data gained by UAV technology using an experimental object has been developed by Lina Kukliene et al, 2017 [4]; Mingxing Gao and his colleagues have conducted high-resolution UAV data use research with digital elevation models (DEM) to identify the shift of the earth's plates to assess seismic hazards (Mingxing Gao et al, 2017) [5]; use of aerial photographs using uav to produce orthophoto maps (D. Wierzbicki et al, 2015) [6]; use of multi-rotor uavs with high resolution camera to produce aerial photographs with a spatial resolution of 2 inches / pixels (Wenang Anurogo et al, 2017) [7]; UAVs used for a wide variety of applications in plant ecology, including mapping vegetation over small-to medium-sized regions (Mitchell B. Cruzan et al, 2016) [10].…”