Estimativa da biomassa usando imagens de satélite.

Abstract

This work was developed to experiment a new approach to find out the accumulated above ground biomass, using Landsat 5 satellite images. To reach this goal, two models were combined. Monteith s model was used for the calculation of photosynthetically absorbed active radiation (APAR) and Field s model was used for determining the light use efficiency. These models were adjusted with some standard meteorological measurements, to determine the parameters necessary for the energy balance and the evaluation of the biomass. The Carnegie Institution Stanford model (CASA) was used for determining the light use efficiency, and the surface energy balance algorithm for land (SEBAL) was used to describe the spatio-temporal variability in land wetness conditions. The conversion of above ground biomass, which influences crop yield directly, and the evaluation of the carbon extracted from the atmosphere has been done considering dairy values. The region was divided into four kinds of vegetation chosen for being representative to the region. The influence of NDVI in the estimation of the accumulated aboveground biomass and the carbon has been also evaluated. The model performs satisfactorily and the values obtained have been compared with those found in the literature.