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Accueil du site → Master → Espagne → Caracterización de la Isla de Calor Urbana (ICU) mediante el uso de imágenes obtenidas por satélite, procesadas mediante software de código abierto QGIS. Aplicación al caso de Valencia

Universitat Politècnica de València (2020)

Caracterización de la Isla de Calor Urbana (ICU) mediante el uso de imágenes obtenidas por satélite, procesadas mediante software de código abierto QGIS. Aplicación al caso de Valencia

Cuesta Navarro, Juncal

Titre : Caracterización de la Isla de Calor Urbana (ICU) mediante el uso de imágenes obtenidas por satélite, procesadas mediante software de código abierto QGIS. Aplicación al caso de Valencia

Auteur : Cuesta Navarro, Juncal

Université de soutenance : Universitat Politècnica de València

Grade : Máster Universitario en Transporte, Territorio y Urbanismo 2020

Résumé
The higher temperature inside the cities, urban heat island (UHI), is caused by land use changes and urbanization. It decreases the quality of life of citizens and has harmful effects on their health. Since it was discovered in 1818, numerous studies and models have been developed in order to analyze, quantify and predict this phenomenon. Traditional methodologies used to study of the ICU include in situ observations and data gathering for the elaboration of climate maps, either using meteorological stations or through methods based on transects. However, this type of measurements require a huge effort, long periods of work and are expensive. Besides, it makes it difficult to keep the data up to date, and they do not provide real-time information. Thanks to the evolution of the internet and open access databases, there is an increasingly number of free sources of information available, which can be really useful on the study the UHI and other phenomena. MODIS (Moderate-Resolution Imaging Spectroradiometer) products are a good example of this free accessible databases. The MODIS instrument is a payload imaging sensor that was launched into Earth orbit by the National Aeronautics and Space Administration (NASA) on board the Terra and Aqua satellites. Those two sensors together are able to detect fires, identify cirrus clouds, map areas covered by snow and ice or measure land surface temperatures (both sea and water). They can provide data from all around the planet every one or two days. One of the main advantages of the data provided by MODIS is that they are easily accessible. Specifically, land surface temperature data (LST), which is useful for the study of urban heat island, can be accessed and downloaded on the website of the North American Land Processes Distributive Active Archive Center Data Center (DAAC). Another advantage of satellite data is that they measure all points in the same way, unlike temporal points of measurement ; or weather stations, which are not always located in the most appropriate places for UHI analysis. Once data are collected, Geographic Information Systems (GIS) are frequently used to process them. This type of programs allow you to organize, store, edit, analyze and elaborate geo-referenced maps, including large amounts of data. In short, GIS programs make it possible to model and work with complex realities. However, licenses for the use of this GIS programs are often expensive. QGIS is an Open Source software licensed under the General Public License (GNU). It is a convenient free alternative to traditional licensed software programs. It is an official Open Source Geospatial Foundation (OSGeo) project that enables you to work with numerous formats and functionalities of vector data, raster data and databases. It also runs on several operating systems. This work aims to evaluate the suitability of land surface temperature images provided by MODIS, and the open source software QGIS, in order study of the phenomenon of the urban heat island in the city of Valencia. The aim is to develop a study methodology of the ICU based on open source information and software with easy and free access. Positively more accessible and efficient models for the study of the phenomenon will be obtained

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Page publiée le 13 février 2021