National Repository of Grey Literature 141 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Temperature characteristics of surface using remote sensing methods
Hofrajtr, Martin ; Štych, Přemysl (advisor) ; Brom, Jakub (referee)
Temperature characteristics of surface using remote sensing methods Abstract The aim of this thesis is to design a methodology for refining the land surface temperature values obtained from Landsat 8 satellite data in areas with diverse land cover. The research section describes factors influencing the radiation of the Earth's surface. Also mentioned are current methods used for processing infrared thermal data and calculate land surface temperature. The practical part describes satellite and airborne data used in the analytical and verification process. All parts of the applied method leading to the subpixel value of the land surface temperature are described in detail in the method part. The results are then compared with airborne verification data with better spatial resolution and with currently used methods. Finally, the pros and cons of this method and its possible improvement in the future are mentioned. Key words: land surface temperature, land surface emissivity, satellite data, Landsat 8, airborne data, subpixel method, Czech Republic
Use of current and historical geospatial data for 3d modeling of hradec králové in different time periods
Šrollerů, Alex ; Laštovička, Josef (advisor) ; Štych, Přemysl (referee)
Use of current and historical geospatial data for 3D modeling of Hradec Králové in different time periods Abstract This bachelor's thesis is mainly focused on historical and current geospatial data and the basics of three-dimensional city modeling. It provides an overview on basic methods, data and software suitable for 3D city modeling in different time periods and possibilities of 3D visualization. The practical part describes the process of creating a 3D model in different time periods, namely the cadastral area of Hradec Králové in the years 1840, 1912, 1952 and present. The model consists of terrain interpolated from ZABAGED contour lines and buildings extruded from vector footprints. Subsequent manual modeling took place in SketchUp CAD software. Historical large-scale maps, contemporary orthophoto and OSM are used for this task. The model is visualized using flyby animations, view scenes, interactive browser and presented on a self-created web page and StoryMap JS. Keywords: 3D model, SketchUp, buildings, DTM, historical data.
Normalization of Time Series Data of Landsat
Svoboda, Jan ; Štych, Přemysl (advisor) ; Kolář, Jan (referee)
Spectral reflectance of the Earth surface, obtained from the satellite images, should be independent from the external influences and should reflect the surface properties, specifically the proportion of the radiance reflected from the object. It was proved in this paper that the time series of the 63 images from the Landsat 5 satellite were visibly influenced by the external factors even in the case of the images already atmospherically corrected. These external factors were age of the image and WRS-2 position from which the image was obtained. Age of the image was documented with the steady decrease of the spectral reflectance values of the invariant features, especially in the visible part of the electromagnetic spectrum, caused by the sensor degradation. The influence of the WRS-2 position was documented especially in the infrared bands. The western parts of the images are lighter (have higher values of the surface reflectance) than the eastern parts. That may cause the difference between values when monitoring one spot in two overlapping WRS-2 positions. The method originally used for the relative radiometric normalization IR-MAD was here applied to normalize the surface reflectance data, and resulted in the fact that these influences did not show up any more. In order to extend the time...
Lost landscapes of mountain agriculture of Šumava (Bohemian Forest): reconstruction, 3D models of landscape and possibilities of their presentation on web
Polák, Mojmír ; Kupková, Lucie (advisor) ; Štych, Přemysl (referee)
The study deals with the model area of the village Prášily in Šumava (Bohemian Forest), which is analysed in the framework of the project "Heritage of lost landscapes: identification, reconstruction and presentation". The goal was to evaluate landscape changes since the middle of the 19th century until present with use of maps of stable cadaster, historical orthophotos, current ortophotos and to create 3D reconstruction models of the landscape and a 3D photorealistic model of the extinct village Hurka. The next aim was to evaluate possibilities of presentation of 3D models on the internet and to find an optimal solution for their web presentation. The theoretical part describes possible methods of evaluation of landscape transformation, development of landscape in the Czech Republic since the middle of 19th century, theory of 3D models, the use of 3D models in practice and the methods of presentation of 3D models. The practical part consists of two landscape models, that were visualized using ArcGIS Online Web Scene, Web Viewer and a 3D model of the extinct village Hůrka with fly- through animation. The models were created using Sketchfab, 3DWarehouse and Google Poly. Sketchfab was chosen as the best solution because of its good visuals and good display on mobile devices.
Evaluation of the land cover in the military training area Libavá using Random Forest classifier
Žďánský, Vít ; Štych, Přemysl (advisor) ; Laštovička, Josef (referee)
Data land cover help us understand nature, how it develops, its uses and the influence that human actions have on it. Thanks to new methods in the remote sensing area, we can record these processes faster and at a larger scale than before. This thesis evaluates accuracy of the Random Forest (RF) and Maximum Likelihood (ML) classifiers using satellite data Sentinel-2 from the military training area Libavá. The military area went through a very specific development and the information regarding natural coverage in the region is missing. The classifier documentation contains 8 classes. The classification results from both algorithms are higher than 80 %. As expected, more accurate results were achieved using the Random Forest classifier. The most accurate classifications were of water surfaces and forests. The least accurate classifications were of agricultural land and sparse vegetation. Other classes varied in accuracy levels. This thesis' results are evaluated using error matrices, overall accuracy and the kappa coefficient. Keywords: classification, Random Forest, Maximum Likelihood, military training area, remote sensing, Sentinel 2, land cover, Libavá
Remote sensing in the secondary school education
Flašarová, Kristýna ; Štych, Přemysl (advisor) ; Král, Luboš (referee)
Remote sensing is a tool that allows us to study Earth's surface using sattelite and aerial imagery. Using this technology, it is possible to obtain data regarding objects as well as processes on Earth and in its atmosphere without being in physical contact with the studied objects. This ability to detect and study objects and processes remotely presents a significant advantage over other methods. The importance of remote sensing has gained considerable recognition in recent years and remote sensing was supposed to be introduced into the curricula of grammar school (gymnázium) and Geodesy and cadaster (Geodézie a katastr nemovitostí) high school programs in 2009. Despite this, approximately half of graduates of these programes between 2010 and 2019 reported not encountering remote sensig in high school. This thesis studies the current state of remote senisng instruction in high schools and tests the Sentinel Hub software in the form of practical assignments accompanied by a detailed manual. This free software has the potential to aid the implementation of remote sensing in education and an overall wider use of this technology as it is applicable in a wide range of disciplines.
Anemo-orographic systems modeling in GIS
Rusnák, Samo ; Brůha, Lukáš (advisor) ; Štych, Přemysl (referee)
Anemo-orographic systems modelling in GIS Abstract The bachelor thesis proposes a model of anemo-orographic systems and implements it in a GIS environment. The key modelling factor is the snow cover shift due to the wind influence. The implemented tool is executable within the ArcGIS environment and as such is a help for localization of anemo-orographic systems, namely of the places, where the accumulation of snow cover occurs. Executable tool was tested in the Krkonoše national park area using multiple data sources describing the terrain model. Achieved results are introduced in the end of the thesis as well as their accuracy and the final map products. Keywords: anemo-orographic system, GIS, spatial modelling
Comparison of changes of land cover and landscape structure in Czech and Austrian borderland in the period 1991 - 2016 using remote sensing
Brůžek, Jindřich ; Kupková, Lucie (advisor) ; Štych, Přemysl (referee)
The aim of the thesis was to compare the development of the land cover and the land use structure in the border areas of the South Moravian Region and Lower Austria on the Czech and Austrian border with the use of data and methods of remote sensing (using the method of Maximum Likelihood). Data from Landsat 5, Landsat 8 (1991 and 2016) with a spatial resolution of 30 m were used for wider area and data from the Rapid Eye with a 6.5 m spatial resolution (2010 and 2016) were used for smaller area of interest Valticko region. The classification legend was derived from the work of Rašín and Chromy (2010). The land cover classification was conducted in the ENVI 5.4 software using training and validation datasetsacquired from the orthophotos and the LPIS database. The best result of the Rapid Eye data classification in 2016 reached overall accuracy 94.87% and the worst reset was reached for Landsat 5 data (88.71%). As for the intensity of land cover changes the most interesting result was obtained for the category arable land, which on the Czech side lost 5.67 percentage points in 2016, while on the Austrian side it was a loss of only 2.81 percentage points. Overall, there were larger changes for data from Landsat satellites, which compared a longer time period. Lower changes have been found out for...
Tree species classification using sentinel-2 and Landsat 8 data
Havelka, Ondřej ; Štych, Přemysl (advisor) ; Kupková, Lucie (referee)
The main objectives of this master thesis are to evaluate and compare chosen classification algorithm for the tree species classification. With usage of satellite imagery Sentinel-2 and Landsat 8 is examined whether the better spatial resolution affects the quality of the resulted classification. According to past case studies and literature was chosen supervised algorithms Support Vector Machine, Neural Network and Maximum Likelihood. To achieve the best possible results of classification is necessary to find a suitable choice of parameters and rules. Based on literate was applied different settings which were subsequently evaluated by cross validation. All results are accompanied by tables, charts and maps which comprehensively and clearly summarize the answers to the main objectives of the thesis.
Presentation of the environmental quality and its influence on the human organism through geostatistic tools, multidisciplinary approach
Stramová, Andrea ; Trubač, Jakub (advisor) ; Štych, Přemysl (referee)
Nowadays exists large amount of data which characterizes environment on base of different parametres. Due to existence of such large amount of data which is difficult to understand and comprehensively visualize, it is necessary to find tools for their proper visualization. The main goal of this thesis is present current environment in place of residence and show possible influence of environmental factors on health. For achieving the goal it was necessary to obtain individual sets of data and prepare them for each analysis and also for their presentation. In thesis there are described various aspects of environment in the area of Příbram region. Also in text is described in detail spatial determined medical data. Thesis contains O2PLS analysis which will create regression model for thyroid function parameters. Output of whole thesis is creating a web application that clearly presents input data (environmental and medical), geostatical and 02PLS analysis. Due to this work has been developed procedure how to prepare a analyze different type of data and also created detailed describtion of presentation results. Till now has not been proven what aspects can affect thyroid function. Many diseases are affected by the environment. This thesis focuses on influence of environment on thyroid function. Main...

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