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Derivation of digital terrain models from laser scanning data and its use for updating of heights of ZABAGED
Dušánek, Petr ; Potůčková, Markéta (advisor) ; Brázdil, Karel (referee)
The topic of diploma theses is creation of Digital Terrain Models from air- borne laser scanning data. This technique of gathering data about ground surface is one of the newest and development of applications is widely spread at academical field but also in last few years it has become real interest of leaders at market with Photogrammetric and GIS software. The main part of work is concentrated at creation of own algorithm for filte- ring of point cloud. There are mentioned the results and critically shown problems and imperfections. For this theses were used data landed by Department of Photogrammetry of Land Survey Office in Pardubice. For this reason there are mentioned suggestions for gathering better point cloud, which probably would be also used for modeling of 3D objects at ground surface. Keywords Airborn Laser Scanning, Filtration, DTM Supervisor Ing. Markéta Potůčková, Ph.D. iv
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Enhancement of DTM in Sandstone Landscapes Using Precise Registration of Airborne Laserscanning Data
Holman, Lukáš ; Lysák, Jakub (advisor) ; Dušánek, Petr (referee)
DTM Improvement in Sandstone Cliffs Relief using precise Co-registration of Airborne Laser Scanning Data Abstract The topic of this thesis is to design innovation of methodology improvement of digital terrain models from airborne laser scanning data in sandstone rocks rugged relief. Theoretical part of this thesis presents the Project GeNeSiS and New Elevation Model Project of the Czech Republic Territory, in which the test datasets were acquired. Simultaneously this section describes in detail methods of co-registrations datasets from strip adjustment to 3D least squares matching method, which have been published until now. In practical part of the work the Pravčická brána model region is introduced firstly. The focus of this section lays on description of new methodology for co-registration and classification of point clouds using spatial query. Co-registration of point clouds, respective detection transform parameters in this thesis is solved by introducing ground control areas. For each such region displacement and rotations in each axis are detected which subsequently determines the global transformation key. Innovation of the thesis lies in the fact that for DTM improvement there is sufficient only one point cloud. The second (and possibly others) point cloud is classified by presented algorithm...
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Visualization of DTMs made from airborne laser scanning data
Picek, Jan ; Lysák, Jakub (advisor) ; Dušánek, Petr (referee)
Visualization of digital terrain models made from airborne laser scanning data Abstract The aim of this study is to evaluate opportunities of 2D visualization of digital terrain models made from airborne laser scanning data. Each method is described in detail with other parameters and approach. The focus is put on methods which are useful for the topographic mapping (f. e. orienteering maps) and for cartographic visualization. All this methods are tested for different data and type of relief (plain, mountainous, rock city, area with negative shapes). The aim of study is to find the optimal method for each type of relief which expresses most of typical features. There are shown methods on the maps for orienteering sports for detection of different object from airborne laser scanning data. Keywords: airborne laser scanning, digital terrain model, data visualization, hillshading
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Analysis of the influence of the calibration and strip adjustment on the geometric accuracy of UAV LIDAR point clouds
Dvořák, Dennis ; Potůčková, Markéta (advisor) ; Dušánek, Petr (referee)
This diploma thesis solves the analysis of the influence of calibration and the method of strips alignment on the geometric accuracy of a point cloud acquired by UAV lidar scanning. The aim was to find out the influence of individual used methods, respectively various combinations. The effect of the design of the cross-flights has also been added. The evaluation was performed using standard deviations of the distances corresponding to the areas scanned in different point bands. Furthermore, verification was performed by comparing checkpoints. The results show that there is no dependence between the individual combinations. The only case was a larger displacement of the point cloud at the edge of the scanned strip in the case of cross-flights.
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Calibration parameters of the UAV laser scanning
Dvořák, Dennis ; Potůčková, Markéta (advisor) ; Dušánek, Petr (referee)
The spatial accuracy of points obtained from aerial laser scanning is most affected by the parameters of the GNSS receiver used, the IMU unit and the parameters of the flight itself. An important role is played by the accuracy of the so-called calibration, ie the determination of the transformation elements between the coordinate systems of the scanning unit itself, the IMU and the position of the phase center of the GNSS antenna. The diploma thesis deals with the calibration accuracy of the IMU / GNSS unit. It compares the displacements and rotations of a point cloud acquired by LiDAR (laser scanner RIEGL miniVUX-1UAV) in relation to the calibration elements given by the manufacturer. Evaluate the results using calculated standard deviations and positional differences in the raw point cloud, or by comparing point clouds obtained by another method. It also focuses on verifying geometric accuracy using checkpoints. The accuracy of the IMU / GNSS calibration is minimal after verifying the results and comparing the influence of the calibration elements given by the manufacturer. There was no significant improvement in the quality of the point cloud. At the same time, it was found that for better quality of the scanned data, it is necessary to perform cross-flights when UAV scanning. Key words UAV,...
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Blocky accumulation mapping from RPAS LiDAR and image data
Kolář, Michal ; Potůčková, Markéta (advisor) ; Dušánek, Petr (referee)
With merit of constant development in measuring technology it is possible to obtain data of high resolution and accuracy describing Earth's surface. During the project "Vegetation and Krkonoše tundra change detection method development by analyzing data from multispectral, hyperspectral and LiDAR UAV sensors" high quality data were acquired, with point density reaching up to 800 points/m2 and orthophoto of GSD 0.02 m. Data are capturing cryoplanation terraces in NE parth of Luční hora in three time periods: June, July and August 2019. The aim of this work is to devise a methodology of blocky accumulation mapping and evaluating detail of data. Key words: blocky accumulation, laser scanning, UAV, point cloud, orthophoto, segmentation
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Utilization of optical and laser data for modeling forest areas
Jebavá, Lucie ; Potůčková, Markéta (advisor) ; Dušánek, Petr (referee)
The thesis deals with the possible use of optical data for modeling forest area compared with utilization of airborne laser scanning data. At first these two datasets are compared and causes of differences are explained. Then canopy height models are made and object-oriented classification is applied for separation of vegetation stands. Methodical procedure is suggested for delineation and detection individual trees in forest. Then their height is detected. There are summarized and other possibilities for improvement in detection and delineation of trees. The results show that optical data with resolution about 25 cm are suitable for dermining the characteristics of the forest stands up to individual tree level. The outputs of this research can be used for forest inventory. Key words: aerial imagery, image matching, laser scanning, point cloud, forest inventory
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Visualization of DTMs made from airborne laser scanning data
Picek, Jan ; Lysák, Jakub (advisor) ; Dušánek, Petr (referee)
Visualization of digital terrain models made from airborne laser scanning data Abstract The aim of this study is to evaluate opportunities of 2D visualization of digital terrain models made from airborne laser scanning data. Each method is described in detail with other parameters and approach. The focus is put on methods which are useful for the topographic mapping (f. e. orienteering maps) and for cartographic visualization. All this methods are tested for different data and type of relief (plain, mountainous, rock city, area with negative shapes). The aim of study is to find the optimal method for each type of relief which expresses most of typical features. There are shown methods on the maps for orienteering sports for detection of different object from airborne laser scanning data. Keywords: airborne laser scanning, digital terrain model, data visualization, hillshading
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Enhancement of DTM in Sandstone Landscapes Using Precise Registration of Airborne Laserscanning Data
Holman, Lukáš ; Lysák, Jakub (advisor) ; Dušánek, Petr (referee)
DTM Improvement in Sandstone Cliffs Relief using precise Co-registration of Airborne Laser Scanning Data Abstract The topic of this thesis is to design innovation of methodology improvement of digital terrain models from airborne laser scanning data in sandstone rocks rugged relief. Theoretical part of this thesis presents the Project GeNeSiS and New Elevation Model Project of the Czech Republic Territory, in which the test datasets were acquired. Simultaneously this section describes in detail methods of co-registrations datasets from strip adjustment to 3D least squares matching method, which have been published until now. In practical part of the work the Pravčická brána model region is introduced firstly. The focus of this section lays on description of new methodology for co-registration and classification of point clouds using spatial query. Co-registration of point clouds, respective detection transform parameters in this thesis is solved by introducing ground control areas. For each such region displacement and rotations in each axis are detected which subsequently determines the global transformation key. Innovation of the thesis lies in the fact that for DTM improvement there is sufficient only one point cloud. The second (and possibly others) point cloud is classified by presented algorithm...
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Derivation of digital terrain models from laser scanning data and its use for updating of heights of ZABAGED
Dušánek, Petr ; Brázdil, Karel (referee) ; Potůčková, Markéta (advisor)
The topic of diploma theses is creation of Digital Terrain Models from air- borne laser scanning data. This technique of gathering data about ground surface is one of the newest and development of applications is widely spread at academical field but also in last few years it has become real interest of leaders at market with Photogrammetric and GIS software. The main part of work is concentrated at creation of own algorithm for filte- ring of point cloud. There are mentioned the results and critically shown problems and imperfections. For this theses were used data landed by Department of Photogrammetry of Land Survey Office in Pardubice. For this reason there are mentioned suggestions for gathering better point cloud, which probably would be also used for modeling of 3D objects at ground surface. Keywords Airborn Laser Scanning, Filtration, DTM Supervisor Ing. Markéta Potůčková, Ph.D. iv
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