Analysis of the heat-island effect of the city of Valencia, Spain, through air temperature transects and NOAA satellite data

SummaryThe aim of this paper is to analyze the heat-island effect of the city of Valencia, Spain, by means of the traditional technique (transects of the air temperature measured from a car) and by means of NOAA satellite thermal images. The analysis includes the nights of 27 and 28 February 1988, on which a light radiative frost occurred. Satellite images were corrected for the emissivity effect by defining an effective emissivity, which was obtained from the emissivity values of the asphalt, walls and roofs of the buildings, and from the proportion of these elements in each pixel. By comparing air temperature values with corrected NOAA data, we have observed that the value of the heat-island effect of the city of Valencia measured from the satellite is 1–2 °C higher than the value obtained along the transects.

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