Urban Thermal Comfort: Comparative Analysis Between Satellite Image Data and Thermographic Camera Data
DOI:
https://doi.org/10.46421/entac.v20i1.6094Keywords:
Remote Sensing, Urban Surface Temperature, Urban Thermal Simulation, Urban heat islandsAbstract
Remote sensing images can be utilized to analyze surface temperatures, microclimates, and urban heat islands, in studies of thermal comfort and energy consumption at the urban scale. On one hand, freely available thermal satellite images generally have a resolution that is insufficient for local studies, potentially leading to significant distortions in the recorded temperatures. On the other hand, portable thermal cameras have the potential to measure surface temperatures with high precision. Therefore, the combined use of thermal satellite images and portable cameras has the potential to bring greater accuracy and reliability to urban analyses, particularly when the analyzed surfaces have a high degree of material heterogeneity. Therefore, this article aims to analyze the relationship between surface temperatures measured in situ and thermal images obtained by the Landsat 8 and Landsat 9 satellites on a reduced scale. For this purpose, measurement points were selected in the city of Porto Alegre, in the state of Rio Grande do Sul, Brazil. At these points, a thermal camera was used to generate images of surface temperature variations of the ground, considering the different materials present at the location, they were taken simultaneously with the satellite images. Preliminary results highlight that the comparison can vary depending on the surfaces and the discrepancies between the pixel dimensions in the Landsat images and those of the thermal camera. However, the analysis of similar surfaces indicates that the use of satellite images has great potential to generate data for use in computational simulations of urban thermal comfort.
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