Database of visible reflectance, solar reflectance and emissivity of urban materials

Methods used for Visible and Solar Reflectance data: Reflectance spectra in the 380 nm - 1700 nm wavelength range were collected from one sample of each product using a fiber-optic portable equipment. For products with application in facades (only in facades or in facades and other applications) and for products with application only in roofs, a high-power tungsten halogen radiation source from Ocean Optics, a 50-mm integrating sphere from Ocean Optics and two spectrometers from Stellarnet (Black Comet for the 380-1050 nm wavelength range and Dwarf Star for the 900-1700 nm range) were used. For products with application only in pavements a tungsten halogen lamp with a color-equalizing filter from Stellarnet was used connected to the two spectrometers via a fiber optic reflectance probe from Ocean Optics, in which seven illumination fibers are located around a central reading fiber. The probe was placed at an angle of 90º/45º with respect to the sample surface for non-glossy/glossy samples. For each sample, reflectance spectra were measured at different points following a pattern to cover the whole surface. The visible and solar reflectance values were calculated from each spectrum following the procedure defined at the UNE EN 410 standard and the mean values and the standard deviation values were collected.