Resultados preliminares da elaboração de um modelo digital de superfície (MDS) para a avaliação do potencial eólico em uma área do sul do Brasil

Abstract

This work presents the preliminary results of the development of a digital surface model (DSM), that will be used to assessing the wind potential in an area partially covered by the municipalities of Aceguá, Bagé, Candiota, Hulha Negra and Dom Pedrito, in the state of Rio Grande do Sul. For the development of MDS, we used data from Landsat 8 and Topodata. The study area encompasses two distinct scenes of Landsat 8 (orbit / point 222/82 and 223/82). To compose the mosaic of the study area, we search for recent images, of near dates. The images were imaged on 25/09/2014 (222/82) and 10/02/2014 (223/82). Initially, techniques of digital image processing were applied. For the supervised classification, we used the method of maximum likelihood. The resulting image has undergone a process of post-classification, in which the confusion generated in the previous step was corrected, particularly with respect to urban areas and areas that had exposed soil. The resulting image has achieved kappa coefficient of 0.9949. The next step was to assign roughness values for each class of land use and land cover, generating the roughness map of the study area, and the MDS. Finally, the MDS file was inserted into a micrositing software that is used to evaluate wind potential.