|
|
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
|
|
|
Hachures in Digital Cartography
Rohelová, Kamila ; Lysák, Jakub (advisor) ; Votoček, Michal (referee)
Hachures in Digital Cartography Abstract This thesis deals with the possibilities of creating hachures, especially slope and shadow, in digital cartography. First part focuses on utilization of hachures and its construction in classic cartography. The rules that should be observed by the mapmaker are described. In the next section are delineated the current possibilities how to create hachures in digital cartography. The existing algorithms are evaluated. On the basis of the rules and research of literature is designed own methodology. Emphasis is put on automation using digital terrain model. The work as well contains testing the algorithm on the real data. Key words: hachures, digital cartography, hypsography
|
|
|
Geomorphological contour interpolation over triangulated irregular network
Morávek, Andrej ; Bayer, Tomáš (advisor) ; Čepek, Aleš (referee)
The aim of this master thesis is to create an application to generate smooth contours with the method of non-linear, so-called geomorphological interpolation over triangulated irregular network using patch technique. The introductory part consists of the state of art in the field of patch modelling and description of georelief in the form of digital terrain models. The core of the work comprises the mathematical background of Bézier triangle patches using barycentric coordinates and interpolation techniques with definition of continuity. The main contribution is a proper algorithm of balanced patch smoothing in order to generate smooth contours as form of georelief representation. Description of linear contour interpolation over triangulated irregular network as a method of indirect geomorphological interpolation is also part of the core. Finally, the last part describes the implementation of algorithms that forms the application, presents and evaluates the results on synthetic and real data.
|
|
|
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
|
|
|
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
|
|
|
Automated recognition of selected terrain features from their cartographic representation
Sykora, Matúš ; Bayer, Tomáš (advisor) ; Brodský, Lukáš (referee)
Automated recognition of selected terrain features from their cartographic representation. This diploma thesis is dedicated to automatic classification of selected terrain shapes and their cartographic representation. The main aim of this thesis is to design methodological approach for automatic recognition of terrain shapes (hills and valleys) with the use of Machine Learning (Deep Learning). The first part of suggested method divides rough terrain segmentation into two categories, which will be then classified with convolutional neural network. The second part of the thesis is dedicated to the very classification of pre-segmented terrain shapes using Machine Learning. Both parts of the processing are using photos SRTM30 as an input data. The whole proposed method was developed in Python programming language with the usage of Arcpy, TensorFlow and Keras libraries. Keywords: Digital cartography, GIS, terrain shapes, Machine Learning, Deep Learning, recognition, classification, segmentation
|
|
|
Simplification of buildings based on typification
Gottstein, Otomar ; Bayer, Tomáš (advisor) ; Jindrák, Přemysl (referee)
Simplification of buildings based on typification Abstract The diploma thesis is focused on cartographic generalization. Its main aim was to develop a new method of simplification of buildings based on typification for areas with lower density of buildings (rural or mountain areas). The proposed method was designed for large scale maps (1 : 25 000 and 1 : 50 000). The presented generalization algorithm is based on preferential selection of buildings to be drawn on the map according to their civic importance, area and location towards roads, railways and streams. It respects cartographic rules used for this type of generalization. The algorithm was implemented in the Python programming language using the Shapely and Fiona libraries for a purpose of its proper testing. The ZABAGED and DATA50 data were chosen as suitable test data. Among other things, this thesis also introduces the evaluation method of typification results, which uses Voronoi diagram. Achieved results are presented on maps of fifteen villages with different spatial structure in both targeted scales. Keywords: digital cartography, generalization, typification, building, simplification
|
|
|
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
|
|
|
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,...
|
|
|
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...
|
guest ::
