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Analysis of terrain skeleton lines in rocky terrain: comparison of information based on ZM 10 and DMR 5G
Kyncl, Günter ; Lysák, Jakub (advisor) ; Šidlichovský, Pavel (referee)
G. Kyncl 2022 Analysis of terrain skeleton lines in rocky terrain: comparison of information based on ZM 10 and DMR 5G Abstract This thesis deals with analysis of terrain skeleton lines in rocky terrain based on cartographic representations of rock formations in Czech state map series. The main aim of the work is to determine how much the representations of rock formations correspond to reality. In the theoretical part the method of rock drawing used in the Czech state map series is described. Then the procedure which was used to derive the terrain skeleton lines from rock formations representations is described. This procedure was for the purpose mentioned above used in author's bachelor thesis. In the next chapter selected methods used for the detection of terrain skeleton lines in digital terrain models are briefly described. Then one of the described methods is chosen and used with modifications in the practical part of this paper. The next section deals with selected methods from the field of digital image processing and computational geometry. The last part is focused on the description of selected methods used to determine the degree of correspondence of linear objects. In the beginning of the practical part the data used in this work are described. The main part of the thesis is focused on...
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Utilisation of cartographic rock representation in the Czech State map series for enhancement of rock formations topographic data in ZABAGED
Kyncl, Günter ; Lysák, Jakub (advisor) ; Šidlichovský, Pavel (referee)
Bachelor's thesis abstract G. Kyncl 2020 Utilisation of cartographic rock representation in the Czech State map series for enhancement of rock formations topographic data in ZABAGED Abstract This thesis deals with utilisation of cartographic rock representation in the Czech State map series for enhancement of rock formations topographic data in ZABAGED. The first part of the paper describes the method of rock drawing developed and used by the Czech Land Survey Office on their base maps. In the next part some methods of computational ceometry which are used in this paper briefly described. Next part is devoted to description of used data on rock formations provided by Czech Land Survey Office. In this part is also described the process of data preprocessing for next usage in the thesis. The main part of this paper deals with the proposal of methods for automatic obtaining the topographic information about rock formations from their cartographic representation. Proposed methods are focused on the classification of rock drawing polygon perimeter and on the identification of ridgelines, valley lines and inner edge lines. Proposed methods are tested and evaluated on provided data. Key words rock formations, rock drawing, state map series, ZABAGED
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Automation of "contour method" for cliff drawing
Lněničková, Petra ; Lysák, Jakub (advisor) ; Bayer, Tomáš (referee)
Automation of "contour method" for cliff drawing Abstract This thesis deals with the design of automated creation of cartographic representation of rocks - specifically contour methods. Based on the study of the rules of this method and its use on analog maps, rules for its processing in digital cartography were designed and an algorithm for automated creation of this representation was designed and implemented. The algorithm is based on the design of the contour method described in the study Topographic mapping of rock formations with the use of airborne laser scanning data by J. Lysák (2016) and the output data of the study Sandstone landscapes in GIS by M. Tomková (2015). The algorithm was implemented in the form of Python scripts using the arcpy library. The thesis also includes testing the algorithm on data from sandstone areas in the Czech Republic. key words: rocks formations, visualization of hypsography , digital cartography, contour method
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Classification of Airborne Laser Scanning Data in Sandstone Landscapes
Tomková, Michaela ; Lysák, Jakub (advisor) ; Potůčková, Markéta (referee)
Classification of Airborne Laser Scanning Data in Sandstone Landscapes Abstract This work is concerned with the classification of airborne laser scanning data in sandstone landscapes called "rock cities". Standard filters do not work reliably in such a rugged terrain covered with dense vegetation and in the results the rock formations are smoothed or even removed from the terrain. The method of classification suggested in this work is based on the procedure used in manual filtration. When exploring a sufficiently dense point cloud in 3D, one is able to distinguish rock formations from trees even though their shapes are similar. In contrast to trees, rock pillars are modeled only by points reflected off the surface and therefore they make concave elevations in the ground. Because of penetration of trees, there are points reflected off a treetop, branches, leaves and also ground under the tree. The proposed method segments a point cloud according to local minima in approximated surface and classifies these objects into classes rock, tree, and mix by inner point distribution. Objects in classes tree and mix are then filtered by lasground function from LAStools. The method was tested with merged point cloud consisted of data from the standard airborne laser scanning of the Czech Republic and experimental...
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Integration of climbing databases with the state map series
Lněničková, Petra ; Lysák, Jakub (advisor) ; Gamrát, Jakub (referee)
INTEGRATION OF CLIMBING DATABASES WITH THE STATE MAP SERIES Abstract This thesis is about the role of inegartion of climbing databases with the state map series and vice versa. I tis based on the web claimbing databases of rocks and state topographic databases Geonames and ZABAGED®. Thesis was created with the help of software tools Oracle SQL Developer and ArcGIS for Desktop. At first, basic terms are explained and a method for integration of data into climbing databases is described and tested. Subsequently, means for completion of coordinates from publicly available sources is described. At last, the process of using climbing data in topographic databases is designed. key words rocks, climbing, topographic database, ZABAGED®, Geonames
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Topographic mapping of rock formations with the use of airborne laser scanning data
Lysák, Jakub ; Potůčková, Markéta (advisor) ; Brázdil, Karel (referee) ; Šíma, Jiří (referee)
Abstract This thesis focuses on topographic mapping of rock formations with the use of new technologies in a comprehensive manner, from airborne laser scanning (ALS) data acquisition and processing in rocky terrains, followed by their processing to the content of topographic databases and their cartographic processing in maps. The introduction discusses issues of importance for practice, and the relation between topographic mapping of rocks and other fields of human activity. The ALS section describes products for topographic mapping of rocks derived from ALS data, and discusses the specifics of ALS data acquisition and processing in wooded rugged terrain. Existing solutions of this problem are explained and their limitations are identified. Author's own approaches to solving this task are presented as case studies, including three made a further three designed experiments with ALS data processing and evaluation of their results. Recommendation regarding mapping of sandstone landscapes in Czechia have been also addressed. The topographic section describes the current representation of rocks and related objects in the ZABAGED database (Czech national digital topographic database), explains the historical context, analyzes this data and identifies their shortcomings in relation to the ALS. Research...
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Sandstone Landscapes in GIS
Tomková, Michaela ; Lysák, Jakub (advisor) ; Holešinský, Oldřich (referee)
Sandstone Landscapes in GIS Abstract This work is concerned with the representation of sandstone rock formations in digital topographic database. It is based on raster datasets derived from digital relief models created from airborne laser scanning (ALS) data. Objects representing rock faces and their edges, rock pillars and peaks, rugged plateaus, cracks and scattered rocks were created in software ArcGIS for Desktop using scripts in Python. Some of these objects also contain attributes like classification of the object and elevation. Testing was performed on ALS data with various density of point cloud in geomorphologically different sandstone landscapes in Bohemia. Field research was conducted in one of the places of interest to verify the reliability of the digital relief model. Key words: rock formations, sandstone landscapes, digital topographic database, GIS
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