Validation of the net radiation through sebal algorithm in different classes of land use and occupation in Rio de Janeiro

Abstract

The aim of this study was (a) to assess and evaluate the net radiation (Rn) by SEBAL algorithm and (b) to assess the net radiation (Rn) by the landscape's spatial temporal dynamic using ISODATA algorithm, in entire city of Rio de Janeiro. Has been calculated the Rn by using the TM sensor images and orbital platform Landsat 5 and by Penman-Monteith method (FAO 56) with the conventional meteorological station data (EMC). The Rn values obtained with the SEBAL algorithm to the EMC cut area were slightly smaller than those obtained by the Penman-Monteith method (FAO 56), with VM = -36 (Wm-2) and EPE = 84.44 Wm-2. The Rn obtained by SEBAL has a high correlation with the values obtained in the surface. The Rn values obtained with the algorithm for the land use and occupation classes in the city of Rio de Janeiro were similar to those reported by other authors for the same classes.

Keywords

• image processing
• remote sensing
• albedo.