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UAV monitoring of montane peatbogs
Kevešová, Adriana ; Langhammer, Jakub (advisor) ; Lendzioch, Theodora (referee)
This thesis deals with UAV imagery analysis as used to monitor environmental settings, in this case a particularly sensitive ecosystem of a peatbog. The non-destructive aspect of UAV monitoring based on remote access to the studied area is crucial in this scenario. Introduction to the topic, examples of the employment of UAV technologies and the possibilities of their application in monitoring peatbogs are followed by examples of visual data analysis with the help of various software on the multispectral data acquired at peatbog Rokytka in the Šumava National Park. Key words: UAV, monitoring, peatbogs, remote sensing, multispectral imaging, classification
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Analýza energetické bilance intravilánu města pomocí metod dálkového průzkumu Země
ŠOUREK, David
The energy balance of each urban area depends on the specifics of active surface and other complex phenomena. In general, compared to the surrounding rural landscape, dry and impermeable surfaces predominate in urban areas. Different types of built-up areas have various properties determining how distributed solar radiation is. Overall, it is through energy fluxes defined by the sensible heat flux, the latent heat flux of evaporation, and the soil heat flux. Besides, vegetation plays a significant role in the proportions of fluxes. Plants can effectively transform the obtained solar radiation and thus influence the microclimatic situation through the cooling effect of evapotranspiration or other ecosystem services. Nevertheless, the efficiency depends on the state of vegetation and other prevailing conditions (weather, etc.). As the study area was selected the town of Písek. The research took place on two summer and two autumn days using remote sensing and statistical evaluation. The results showed the growing dependence of the latent heat flux of evaporation in localities with a higher vegetation density and a sufficient water supply. High values of surface temperature and sensible heat flux occurred in built-up areas with predominant materials with a large specific heat capacity, i.e. concrete, asphalt, sheet metal, stone etc. These indicators thus defined some problematic types of built-up areas, especially in terms of surface overheating or of the occurrence of local heat islands. Specifically, it was the historic centre, industrial zones and shopping centres. A better microclimatic situation prevailed in the park with a water surface, suburbs and built-up areas of family houses.
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Analysis of satellite data applicability for rock glacier creep monitoring
Palúchová, Miroslava ; Brůha, Lukáš (advisor) ; Potůčková, Markéta (referee)
Analysis of satellite data applicability for rock glacier creep monitoring Abstract Rock glaciers are characteristic forms of periglacial high mountain environments. The creeping of active rock glaciers and changes in its velocity are important indicators of climate change. If unstable, rock glaciers can impose hazards to anthropogenic objects and/or populated areas. The presented thesis deals with the question of rock glacier creep monitoring with the use of satellite data. Two main methods for detecting and measuring the movement of landforms on optical and radar imagery are introduced. These methods are image matching and differential SAR interferometry. The goal of the thesis is to evaluate the applicability of the given methods for the research of the movement of rock glaciers. The thesis provides an overview of existing satellite data as well as an analysis of their suitability for research depending on rock glacier velocity. Keywords: remote sensing, movement monitoring, rock glaciers, image matching, DInSAR
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Determination of Snow Cover Area from RADAR imagery
Součková, Jana ; Potůčková, Markéta (advisor) ; Brodský, Lukáš (referee)
This thesis deals with snow cover mapping by using time-series of SAR images of the sensors ENVISAT ASAR and TerraSAR-X. The methodology is based on the so-called Nagler's algorithm, which is based on determination of the change of absorption of radar signal due to the liquid water content in the snow cover. The resulting ratio image is classified into the areas with wet snow or without it according to the selected threshold value. The results are compared with the maps of snow cover derived from MODIS optical data and with data from meteorological stations of CHMI. The main aims of this work are to suggest most suitable conditions (time of the year, weather) for acquisition of reference images, to find the change of the threshold value with respect the chosen reference image and the type of land cover. The same methodology should then be applied on the radar data of shorter wavelength. The obtained results will be further used for improving the methodology of snow cover mapping from SAR data in the Czech Republic.
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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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Detection of Equilibrium Line Altitude (ELA) Changes from Remote Sensing Data; Case Study from the Cordillera Blanca, Peru
Paraj, Zsolt ; Potůčková, Markéta (advisor) ; Kropáček, Jan (referee)
The aim of this diploma thesis is to monitor glacier change in the Cordillera Blanca in the period from 1987 to 2014. This diploma thesis focuses on three mountains and eleven glaciers in the northern part of the Cordillera Blanca. The input data consist of 29 Landsat scenes (Landsat 4,5,7 and 8) and the ASTER global digital elevation model version 2. Semi-automatic classification algorithm is created based on threshold values detected by spectral analyses of selected land cover types in the Cordillera Blanca. Additionally, the mean snowline (equilibrium line) altitude change is computed for all of the three mountains and eleven glaciers. Besides, glacier change depending on slope and aspect is evaluated. The results of this diploma thesis are presented in maps, tables and charts. The results of the classification are compared with the GLIMS Glacier Database and the field measurements provided by Adam Emmer, MSc. Finally, the advantages and disadvantages of the new Landsat 8 satellite sensor are discussed. Key words: Remote sensing, Landsat, classification, ice and snow detection, ELA, Cordillera Blanca
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Classification of road network from airborne laser scanning data and from remote sensing images with high resolution
Kuchařová, Jana ; Potůčková, Markéta (advisor) ; Kupková, Lucie (referee)
Classification of road network from airborne laser scanning data and from remote sensing images with high resolution Abstract Object classification of land cover is currently one of the methods of remote Earth exploration. Road network classification only is unique because it is covered with anthropogenic material and has different characteristics than other elements of the landscape. This work deals with the possibility of using a combination of data from airborne laser scanning and high resolution optical data for detection of the road network in the specific area. The premise is that the use of two different types of data could provide better results, because airborne laser scanning data provide very precise information about the position and height of the point, while satellite data of very high resolution represent the real landscape. Searching for suitable features and classification rules for unambiguous determination of the road network is one of the objectives of the work. Segmentation parameters will also be important for object classification. Another objective is to verify the transferability of classification schemes into the other scene. The results should present a response on whether a procedure can be applied over a different location and also that the use of two types of data can bring...
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Classification of glacial lakes and methods of inventory
Pisarčíková, Alexandra ; Vilímek, Vít (advisor) ; Šobr, Miroslav (referee)
Classification of glacial lakes and methods of inventory Abstract: Classification of glacial lakes has its application all around the world. However, there is no unified system of typology that would make it possible to simplify and increase the effectivity of labour inventory. The thesis is dedicated to creation an overview of the definitions of glacial lake divided by euro-atlantic and asian literature and its resulting evaluation. The inventory of glacial lakes is closely connected to their classification. Therefore, the work subsequently presents individual methods that lead to the creation of a lake inventory. The basis of the creation of a design of the classification system is the research from already created glacial lakes classifications and analysis by which typology can be created. Overall, the classification of the lakes is divided into two main groups: by position to glacier or relief and according to the type of dam. Furthermore, 280 glacial lakes were analysed based on the inventory table in an interest area. On the basis of a created classification design, most of the lakes were classified under the inventory, thereby confirming its used application. Keywords: glacial lake, typology, classification, inventory, RS
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Analysis of landcover changes in the area of Sokolovsko using GIS and remote sensing
Šubr, Ondřej ; Matějíček, Luboš (advisor) ; Rojík, Petr (referee)
Region called "Sokolovsko" is an area in the Czech Republic in which a coal mining has caused a great interference with the appearance of the landscape. With a subsequent reclamation, the affected areas are recreated into new landscapes, however on the research base, the non-interference approach is applied in order to follow the principles of a natural succession. This diploma thesis examines the influence of the origin, respectively the relief of the dump area on the intensity of the spontaneous vegetation growth, within the example of the Velká podkrušnohorská spoil heap, based on the data collected by remote sensing techniques. The vegetation indices NDVI and SAVI were used to reveal the intensity of the vegetation cover on the area of the interest. It is clear from the results that the vegetation growth is considerably faster in the areas with the original, wavy relief. It was also found that the vegetation growth of the non reclaimed area of Velká podkrušnohorská spoil heap in the parts of which the relief was settled at the time of the origin differs from the non reclaimed area of which the relief was left in the original wavy surface and later over layered with a new material. Finally it was made a comparison between the non reclaimed part of the Velká podkrušnohorská spoil heap whose...
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Detection of Equilibrium Line Altitude (ELA) Changes from Remote Sensing Data; Case Study from the Cordillera Blanca, Peru
Paraj, Zsolt ; Potůčková, Markéta (advisor) ; Kropáček, Jan (referee)
The aim of this diploma thesis is to monitor glacier change in the Cordillera Blanca in the period from 1987 to 2014. This diploma thesis focuses on three mountains and eleven glaciers in the northern part of the Cordillera Blanca. The input data consist of 29 Landsat scenes (Landsat 4,5,7 and 8) and the ASTER global digital elevation model version 2. Semi-automatic classification algorithm is created based on threshold values detected by spectral analyses of selected land cover types in the Cordillera Blanca. Additionally, the mean snowline (equilibrium line) altitude change is computed for all of the three mountains and eleven glaciers. Besides, glacier change depending on slope and aspect is evaluated. The results of this diploma thesis are presented in maps, tables and charts. The results of the classification are compared with the GLIMS Glacier Database and the field measurements provided by Adam Emmer, MSc. Finally, the advantages and disadvantages of the new Landsat 8 satellite sensor are discussed. Key words: Remote sensing, Landsat, classification, ice and snow detection, ELA, Cordillera Blanca
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