MÉTODO INDIRETO PARA OBTENÇÃO DE ALTURAS DE EDIFICAÇÕES A PARTIR DE IMAGENS DE SATÉLITE

Abstract

Some factors influence the use of open public spaces, among them solar access, climatic and comfort factors, the design and ergonomics of such spaces. Shading from adjacent high-rise buildings can change the thermal environment in different seasons during the year, stimulating or not the use of these places. The evaluation of the impact of shading in winter can be done according to two different methods, directly or indirectly. Among the direct methods we can mention: the cadastral information made available by the competent authorities of the municipality, in situ measurements with Total Station, measurements by means of existing applications, or with a tool from Google Earth Pro, currently available only for Brazilian capitals. The indirect method originates from the analysis of the shadows of the buildings projected on the ground through remote sensing. This study presents an indirect method to obtain height of buildings from the analysis of the projected shadows in the ground, observed from satellite images available online, based on geometric relations and solar geometry. Results obtained in the application of the indirect method demonstrated that the method is reliable. The differences in results between on-site measurements and measurements using the proposed method were mostly small.