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Data representation for smooth level of detail of spatial objects
Feber, Lukáš ; Brůha, Lukáš (advisor) ; Bayer, Tomáš (referee)
The thesis deals with the concept of level of detail and its use in 3D GIS. The aim of this work is to design a data structure that will allow continuous rendering of discrete 3D building models with different levels of geometric detail, which were created by generalization method based on mathematical morphology approach. The proposed solution creates links of corresponding geometric primitives of models at different level of detail at first and then reconstructs them using the extrusion method. The data structure created in this way is able to generate and render any model, including intermediate models, which are represented as slices through the data structure across the axis of geometric detail.
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3D data representation and visualization of complex features of traffic infrastructure
Hřebec, Tomáš ; Brůha, Lukáš (advisor) ; Laštovička, Josef (referee)
7 Abstract This bachelor thesis designs and implements the process of creating and visualizing of 3D models of complex elements of road infrastructure with focus on level crossing. The theoretical part outlines the principles of modeling, methods of collecting spatial data using the Structure from Motion method and aerial images. This thesis also introduces the basics of Blender software, which the model is created in, and how ArcGIS Pro software, in which the final models are visualized, works with 3D data. Model of a bridge is created by an add-on for Blender. This work describes how the add-on was created, how it works and how to control it. In the end, there is described how to visualize the models. Keywords: Spatial data structures, 3D GIS, 3D visualization, traffic infrastructure
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Use of contemporary 3D geoinformation technologies for historical reconstructions of sites: case study Zahrádka u Ledče nad Sázavou
Berka, Rostislav ; Laštovička, Josef (advisor) ; Štych, Přemysl (referee)
Use of contemporary 3D geoinformation technologies for historical reconstructions of sites: case study Zahrádka u Ledče nad Sázavou Abstract This bachelor thesis deals with contemporary 3D GIS technologies and methods used for historical reconstructions, especially reconstructions of lost sites and objects. Thesis contains an overview of technologies, methods and softwares suitable for these purposes. Thesis is focused on quite unique single image-based modeling, which uses geometry of object in the image. There is also brief overview of visualisation 3D models on the internet and web mapping. Thesis introduces a prescription for creating 3D model of lost site. First, TIN is produced from contours of old maps and DMR 5G data using breaklines, which are generated automatically. SFM models of preserved objects and models of destroyed objects acquired through single image-based modeling with help of old archival images, are placed on DTM. The case study area is the lost town of Zahrádka u Ledče nad Sázavou. The results of this work are view scenes and interactive web map aplication for visualisation of 3D model. The accuracy of used single image-based modeling method is compared to the standard SFM technique. SFM had better accuracy. Keywords: 3D model, 3D GIS, single image-based modeling using geometric...
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Generalization of LOD2 building models using the aggregation method
Měchurová, Kristýna ; Brůha, Lukáš (advisor) ; Pokorný, Tomáš (referee)
Generalization of LOD2 building models using the aggregation method Abstract The thesis proposes and implements a method of 3D building models aggregation. The procedure achieves global optima by the means of mathematic optimization. Buildings are aggregated according to similarity characteristics typical for LOD2, e. g. roof type. Aggregation process is driven by minimalization of volume changes and of the aggregate count. The optimization problem was implemented as a Python script with optional parameters to meet custom demands of a wide range of users. Input data models of buildings are created by the method of procedural modelling. Its outcome is further restructured into form of continuous blocks. Finally, the visualization procedure is designed and implemented to illustrate the results of optimized aggregation of 3D building models. Keywords: 3D GIS, generalization, aggregation, mathematical optimization, procedural modelling
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Automatic generalization of 3D building models
Brýdl, Ivo ; Brůha, Lukáš (advisor) ; Bayer, Tomáš (referee)
The main aim of this thesis is to propose a novel method for generalization of 3D building models with respect to topology in 3D space. The first part gives an overview over spatial data structures and methods for generalization of 3D objects. The second part presents the methodology composed of volumetric mo- del reconstruction, topology validation and simplification of geometry based on mathematical morphology approach to build multi scale model. Method is then implemented and experimental results are presented. In conclusion results are discussed and possible improvements are suggested.
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Modelling of subterranean features in GIS: case study of Amerika quarries
Kutišová, Tereza ; Lysák, Jakub (advisor) ; Jaroš, Jakub (referee)
Modelling of subterranean features in GIS: case study of Amerika quarries Abstract Goal of this bachelor thesis is to create description of modelling methodology of subterranean features by using geoinformation systems. Modeling concerns locations of quarries called Amerika in Český kras. There is system of mine drifts and adits, which is relict of limestone mining in this area. Main task in the work was to creat 3D model of underground drifts and tunnels. During the creation were collected data about this location, those were described in detail, and evaluated for suitability in model creation. Created model was used in another output: Thematic map, which is describing state of surface and subsurface at the same time. Key words: subterranean features, 3D GIS, modelling, Amerika quarries (Czech Karst)
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