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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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Waterfalls in Digital Topographic Databases and Digital Cartography
Pánová, Pavla ; Lysák, Jakub (advisor) ; Skalický, Filip (referee)
Waterfalls in Digital Topographic Databases and Digital Cartography Abstract The purpose of this work is to apprise a user with basic types of waterfalls and opportunities to improve information about them, especially to improve the ZABAGED database and a representation of The base map 1 : 10 000. The sectional purpose is to describe the waterfalls worldwide and their representation in foreign databases and maps, and a possibility to apply these findings for the Czech Republic. There will be presented a draft for automated creation of a cartographic presentation of the waterfalls and rapids for medium scale topographic maps, especially for The base map 1 : 10 000. There will be demonstrations of representation of the waterfalls from foreign and Czech sources as a supplement. Keywords: waterfalls, rapids, digital topographic database, digital cartography
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Accessibility analysis of Prague public transport stops
Kapusta, Michal ; Štych, Přemysl (advisor) ; Lysák, Jakub (referee)
This document concerns with the network analysis of accessibility and space inclusion of the Prague public traffic stops. The main theme of the background research is accessibility and network analysis problematics. During analysis, the ESRI ArcGIS 9.3 software was used to test the time accessibility zone hypothesis as well as households' and companies' distribution. The map of spatial inclusion was also created for separate types of transports as well as for all public transport stops in Prague as well. The hypothesis of space public transport stop inclusion area increase away from center was proven to be true, however the dependancy of the households allocation in relation to the city center was not proven. The similiraity between households and companies allocation was found not to be fully provable. key words: accessibility, space inclusion, network analysis, Prague public city transport, ESRI ArcGIS 9.3
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Detection of Terrain Skeleton Lines based on Laser Scanning Data
Jaroš, Jakub ; Lysák, Jakub (advisor) ; Bayer, Tomáš (referee)
The objective of the thesis is to design a new detection method of terrain skeleton lines from airborne laser scanning data. The theoretical part provides a brief introduction to airborne laser scanning issue. There are presented major principles of the technology and procedures applied to create digital terrain model from laser data. There is also described an application of airborne laser scanning in the area of the Czech Republic in detail and follows an exact specification of key terms of the thesis. From the geomorphology, topography and geoinformatics point of view there are defined especially terms like terrain skeleton lines, breakline, valley and ridge. Literary research consists of the summary of already published method of breakline detection. There are algorithms focused on data processing in form of original point cloud as well as algorithms focused on processing data in the raster form. Primary goal of the theoretical part is to express major principles of already published method of detection. The practical part firstly introduces data that are used further in the thesis. The objective of the thesis is a description of a new method of detection of terrain skeleton lines. The method processes laser data converted into raster form and it is based on the analysis of transverse elevation profile...
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Algorithm for automated building simplification using aggregation
Svobodová, Jana ; Bayer, Tomáš (advisor) ; Lysák, Jakub (referee)
Algorithm for automated building simplification using aggregation Abstract Diploma thesis deals with automated cartographic generalization. The main aim is to propose a new generalization algorithm for building aggregation. The first part brings summary of existing algorithms for building aggre- gation. Then the new algorithm is presented: at first, auxiliary data structu- res and algorithms are presented, then cartographic and geometric require- ments are defined. New algorithm is based on the principle of straight skeleton construction. Outer vertices are removed from constructed straight skeletons and those structures are aggregated. The aggregated polygon is reconstructed from ag- gregated structures. The second part is focused on implementation and results evaluation. The algorithm is implemented using open-source libraries CGAL, Boost and Shapelib. The results and confrontation with SW ArcGIS are discus- sed in conclusion of the thesis. 1
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Design of Pravčická brána 3D model and its integration with 2.5D TIN terrain model
Brýdl, Ivo ; Brůha, Lukáš (advisor) ; Lysák, Jakub (referee)
The main goal of this thesis is to design integrated model containing a three-dimensional representation of Pravčická brána rock arch and 2.5D TIN model of surrounding terrain. Point cloud from airborne lidar measurements has to be classified into ground and non-ground features. The ground points are the basis of the TIN terrain representation. Second part of this thesis is focused on methods for reconstructing 3D surface from given points set retrieved with ground-based lidar measurement. The thesis describes the process of meshing point cloud with Poisson surface reconstruction. Finally, these two models are oriented and translated to real coordinates in order to form integrated hybrid model covering part of České Švýcarsko National Park.
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Monitoring forest land by using the satellite high temporal resolution data in Czechia
Musilová, Romana ; Štych, Přemysl (advisor) ; Lysák, Jakub (referee)
Monitoring forest land by using the satellite high temporal resolution data in Czechia Abstrakt Research forest land by using remote sensing data is currently still being developed. This work aimed to evaluate the possibility of using data of high temporal resolution of satellite ENVISAT, specifically MERIS and AATSR sensors. First were identified two model territories, namely Krkonoše and area of Železné hory and Žďárské vrchy. Selected data were preprocessed, then the vegetation indices were calculated, which were used to describe the behavior of forest during the growing cycle, assessment of their health condition and humidity using AATSR data. Anothe part deals with a simple algorithm that would allow the highlight areas of forest to MERIS images. In the end I made a comparison of selected indices of monitoring forest land that type of data. Keywords: remote sensing, forest land, MERIS, AATSR, Envisat
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Application of airborne laser scanning in forests
Sedláčková, Oldřiška ; Potůčková, Markéta (advisor) ; Lysák, Jakub (referee)
Application of airborne laser scanning in forests Abstract The main aim of this work is to determine a laser pulse penetration through forest stands according from airborne laser data acquired at the beginning of a vegetation growth. Another goal is to evaluate different methods of mean tree height determination. In the first part the technology of airborne laser scanning (ALS) and its application in forest inventory is introduced. The use of ALS data for generating digital terrain models in forested areas is evaluated. A project of a new digital elevation model of the Czech Republic is introduced. Furthermore, methods of data processing are described and characterization of areas of interest in Dobruska and Sobotka is done. Comparison of a laser pulse penetration through different forest types and evaluation of a suitable method for mean tree height determination are main outputs of this work. Keywords: airborne laser scanning, digital terrain model, laser pulse penetration, mean tree height.
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The use of straight skeleton for the roof shape reconstruction from the laser scanning data
Ečer, Pavel ; Bayer, Tomáš (advisor) ; Lysák, Jakub (referee)
The objective of this study is to explore the methods used for automatic roof reconstruction so far and on the basis of this analysis purpose a methodology, which uses the geometric structure of Straight Skeleton for an initial approximation of the roof shape. In the first part of this thesis issues of automatic detection and extraction of building roof planes from laser scanning data are explored. Also, the Straight Skeleton is described in detail here and its potential for the construction of hip and saddle roofs is explained. An iterative approach which consists of deleting or moving appropriate points between roof planes using the principles of orthogonal regression is specified as an optimization method. In the second part of this thesis the proposed algorithm was implemented using CGAL (an open source library) and then it was tested on different data sets. In the very end, it is concluded that the use of the proposed algorithm on more complex types of roofs is inappropriate. The excellent results of the optimization of hip and saddle-shaped roof types are highlighted simultaneously.
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