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A heuristic approach to resolving graphical point feature conflicts in large-scale maps
Pumr, Daniel ; Lysák, Jakub (advisor) ; Bayer, Tomáš (referee)
The paper deals with automation of cartographic generalization of point features by displacement and selection in large scale maps. In the first part of the thesis, the theoretical foundations of this process are introduced with emphasis on the works of authors who have dealt with its automation. The next part of the thesis describes and analyses the ZABAGED data from which the state map work is produced and on which the algorithm developed in the practical part of this thesis was tested. The main objective of the work was then to determine whether it is realistic to use a solution based on sequential intelligent testing of different offset positions of overlapping point features in practice. Within this framework, the strategies by which the state space given by the possible offset point positions can be generated and searched are identified and described. These strategies were then implemented over the ZABAGED dataset, tested and compared, and a conclusion was drawn on the applicability of this approach in automatic generalization. Key words digital cartography, cartographic generalization, generalization by selection, generalization by displacement, point features, heuristics
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Analysis of Generalization Methods of Land Use/Land Cover Objects on Czech State Map Series
Klesík, Dávid ; Lysák, Jakub (advisor) ; Skalická, Iveta (referee)
This master thesis focuses on the detailed analysis of the present manual generalization of LU/LC objects from ZABAGED data to a scale of 1 : 50 000, to propose options for its future automatization based on ArcGIS software tools. Analyses of generalization methods are carried out on the data of the entire Czech Republic, by spatially comparing topologically correct objects of different scales and examining their characteristics. These analyses are therefore built on the principle of reverse engineering, when based on known inputs (original ZABAGED data) and outputs (manually generalized Data50 data), other inputs are derived in the form of criteria values used in the current practice. This is approached in such a way that by applying these detected values in the parameters of the ArcGIS functions, results comparable to the current generalized data are achieved. The Python programming language with the ArcPy library is used to perform the analyses. The derived values of current practice are described in detail and presented in tables, while their possibility and way of application in the future process of automatic generalization is determined. These results are also confronted with the Technical procedure for the creation of ZM 50. Based on this, the shortcomings of this manual and the derived...
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Simplification of contour lines in flat areas
Čelonk, Marek ; Bayer, Tomáš (advisor) ; Kolingerová, Ivana (referee)
Simplification of contour lines in flat areas The diploma thesis is focused on the cartographic generalization of contour lines derived from dense point clouds in flat territories, where the original contour lines tend to oscillate. The main aim is to propose, develop and test a new algorithm for the contour simplification preserving the given vertical error and reflecting the cartographic rules. Three methods designed for large scale maps (1 : 10 000 and larger) are presented: the weighted average, modified Douglas-Peucker and potential-based approach. The most promising method is based on the repeated simplification of contour line segments by calculating the generalization potential of its vertices. The algorithm is implemented in Python 2.7 with the use of Arcpy library was tested on DMR5G data, the simplified contour lines were compared with the result created by a professional cartographer. Achieved results are presented on attached topographic maps. Keywords: contours, cartographic generalization, digital cartography, vertical buffer, smoothing, GIS
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Proposal of methodology for Protected Landscape Area maps production
Pekařová, Kateřina ; Lysák, Jakub (advisor) ; Jaroš, Jakub (referee)
Proposal of methodology for protected landscape area maps production Abstract The main goal of this bachelor's thesis is to create a proposal for a methodology for creating maps of protected areas in Czech Republic. The first part of the paper is devoted to acquaintance with the basic knowledge of thematic cartography with emphasis on the basic cartographic rules in the creation of maps. The following is an evaluation of existing maps of protected areas in the Czech Republic and in the world. An overview of data sources is also given. Based on the findings from the first part, the practical part of the thesis then creates the proposal of methodology itself, which is tested on sample maps. Keywords: thematic map, nature conservation, spatial data, cartographic generalization, methodology
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Production of cartographically correct countour lines from airborne laserscanning data in flat terrain
Picek, Jan ; Lysák, Jakub (advisor) ; Bayer, Tomáš (referee)
Production of cartographically correct countour lines from airborne laserscanning data in flat terrain Abstract The thesis is dedicated to the creation of contour lines from the data of airborne laserscanning in flat areas. For creation of contour lines in these parts is necessary specific generalization, that smooths unwanted artifacts, but does not delete the shapes, which are characteristic for the relief. The first part of the thesis is to serve as a short insight into the areas on which it is built, this thesis: the principle of airborne laserscanning and basic information on the contour line model. On the basis of technical literature are defined the requirements for the correct representation of the contour and cartographicly presented the different types of the DEM and generalization of contours. The main aim of this work is to design an algorithm that will combine several methods of generalization of contour while maintaining altitude accuracy as well as other requirements on their cartographicly the right terms, and to test this approach in several territories. In conclusion, the results of the methods of work and its implementation critically evaluated and outlined other possible developments of this issue. Keywords hypsography, airborne laserscanning, digital cartography, contour lines,...
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Automatic Detection and Cartographic Generalization of Spot Heights from Digital Terrain Models
Polášek, Petr ; Lysák, Jakub (advisor) ; Tippner, Aleš (referee)
The aim of this work is to design automatic detection of spot heights from airborne laser scanning data and its generalization. The first part is about the idea of spot height: the importance of spot heights for altimetry representation on maps and suggestions concerning the scatter of spot heights on maps. In the following part, different approaches for terrain critical points extraction (peaks, depressions, passes) from digital terrain models are described as suitable places for spot heights location. Further, we introduce a description of geomorphological characteristics of these points by which is possible to identify its significance and generalize them. In accordance to analysis of Základní mapa ČR and recommendation for spot heights location described in literature we designed own method of automatic generation and generalization spot heights from digital terrain models. This method were implemented and there is a description of the test data and results on the real data DMR 5G of the algorithm in the end of the work. Powered by TCPDF (www.tcpdf.org)
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