ASSESSING THE UNCERTAINTY IN VARIOUS TECHNIQUES OF ROOFTOP ALBEDO MEASUREMENT

Abstract

 Rooftop albedo data are necessary to improve the accuracy of weather simulations. In this study, the rooftop albedo of building using all possible methods to understand the uncertainty of albedo measurements, including on-site measurements and remote sensing in Tokyo. As a result, the albedo values calculated by each method were different, and the one by the hyperspectral meter, showed a large discrepancy from the other due to the directivity of the solar reflectance. The remote sensing methods using satellite and aerial images include albedo values other than that of the building materials targeted by the field observation due to the influence of image resolution, which leads to the difference between the albedo values.