Določanje temperature tal iz satelitskih posnetkov Landsat : magistrsko delo

Cedilnik, Rok (author), Oštir, Krištof (mentor), Kokalj, Žiga (comentor)

Satelitski posnetki, zajeti v termičnem infrardečem delu spektra, se danes pogosto uporabljajo pri raziskavah sprememb na svetovni ravni. Mednje se uvršča tudi pojav mestnega toplotnega otoka. Pričujoča magistrska naloga v prvem delu obravnava teoretično ozadje določitve temperature tal iz satelitskih posnetkov Landsat. Opisani so dejavniki, ki vplivajo na elektromagnetno valovanje v termičnem delu spektra ter metode, ki omogočajo njihovo določitev ali oceno. Podrobno so predstavljeni algoritmi za določitev temperature tal iz satelitskih posnetkov Landsat in njihova dosežena natančnost. Drugi del temelji na raziskavi pojava mestnega toplotnega otoka v Ljubljani. Prioritetno so bili uporabljeni posnetki satelita Landsat 8, v analizo pa smo vključili tudi posnetke satelita Landsat 5 in 7, ki so omogočili kronološki pregled temperature tal v Ljubljani. Rezultati analiz potrjujejo prisotnost mestnega toplotnega otoka in izpostavijo območja v mestu, ki se pogosto pregrevajo.

• Language: Slovenian
• Keywords: geodezija, magistrska dela, temperatura tal, mestni toplotni otok, Landsat, emisivnost, srednja temperatura atmosfere, atmosferska transmisija
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: FGG - Faculty of Civil and Geodetic Engineering
• Place of publishing: Ljubljana
• Publisher: [R. Cedilnik]
• Year: 2015
• Number of pages: VIII, 45 str., 2 pril.
• PID: 20.500.12556/RUL-32772
• UDC: 502.3:528.7/.8(497.4)(043.3)
• COBISS.SI-ID: 7073633
• Publication date in RUL: 10.07.2015

Secondary language

• Language: English
• Title: Determination of land surface temperature from Landsat satellite imagery

Abstract

Satellite images acquired in the thermal infrared part of electromagnetic spectrum are often used in studies of environmental changes, including the phenomenon of an urban heat island effect.. The first part of this master thesis deals with theoretical background of land surface temperature determination from Landsat satellite images. Factors that affect the electromagnetic waves in the thermal part of spectrum and methods that allow their determination or assessment are described. Algorithms and their accuracy for determination of land surface temperature from Landsat images are presented in detail. The second part describes the study of an urban heat island in Ljubljana. Data from Landsat 8 was used primarily, but we also included Landsat 5 and 7 images. This enabled a chronological overview of land surface temperature in Ljubljana. Results confirm the presence of the urban heat island and highlight the often overheated areas in the city.

• Keywords: geodesy, master of science thesis, land surface temperature, urban heat island, Landsat, emissivity, mean atmospheric temperature, atmospheric transmittance