Albedo Quantification Using Remote Sensing Techniques. Cool Roof in the Metropolitan Area of Mendoza-Argentina

COLLI, M F; CORREA, E N; ALCHAPAR, N L

IOP Conference Series: Earth and Environmental Science

Iop publishing

Lugar: Bristol; Año: 2020 vol. 503 p. 1 - 9

1755-1307

The presence of cities raises air temperature. The growth of sealed urban surfaces andanthropogenic heat modifies the natural energy balance increasing the CO2 emissions of a city.A strategy to reduce urban temperatures and energy consumption is the widespread applicationof cool materials -with high albedo and high emissivity- in the urban envelope. Roofs are thehorizontal opaque surfaces most exposed to solar radiation and are therefore the ones that absorbthe highest thermal load of a building. The objective of this research is to design a procedure thatallows the discrimination the different roofing materials within the Metropolitan Area ofMendoza, Argentina, to determine the possible energy savings and improvements in urbanmicroclimatic conditions associated with the increase of albedo in the roofs of the city. Themethodology is based on a supervised classification of roof materials using spectral signatureswith QGIS 3.2 ´Bonn´ software. For this purpose, images from the Sentinel 2a platform wereused and 3 series of spectral signatures were obtained from built urban areas. The results showthat the materials mainly used in the roofs of the city of Mendoza are membranes (74%), zincsheet (14%) and traditional tiles (13%). These findings represent an efficient tool to quantify theenergy and environmental effects of regulating albedo values in urban roof.