%0 Conference Proceedings
%4 sid.inpe.br/marte2/2015/06.15.14.39.32
%2 sid.inpe.br/marte2/2015/06.15.14.39.33
%@isbn 978-85-17-0076-8
%F 209
%T Caracterização espectral de fragmentos florestais com imagens Worldview-2 em função da elevação
%D 2015
%A Breunig, Fábio Marcelo,
%A Galvão, Lênio Soares,
%@affiliation
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@electronicmailaddress fabiobreunig@gmail.com
%E Gherardi, Douglas Francisco Marcolino,
%E Aragão, Luiz Eduardo Oliveira e Cruz de,
%B Simpósio Brasileiro de Sensoriamento Remoto, 17 (SBSR)
%C João Pessoa
%8 25-29 abr. 2015
%I Instituto Nacional de Pesquisas Espaciais (INPE)
%J São José dos Campos
%P 1121-1128
%S Anais
%1 Instituto Nacional de Pesquisas Espaciais (INPE)
%X Discrimination of forest species and/or canopy structure is important based on spectral reflectance. In this paper, we present a spectral reflectance characterization of some forest fragments having primary and secondary native species from inspecting a Worldview-2 8-band image acquired on July 26, 2013. We also study variations in deciduousness in the fragments with elevation data. The site is located in the Frederico Westphalen municipality, Rio Grande do Sul State, South Brazil. The Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) global digital elevation model (GDEM) was used. The image was atmospherically corrected using the Fast Line-of-sight Atmospheric Analysis of Hypercubes (FLAASH) code. It was masked to eliminate the non-forest areas. The average reflectance spectra of four forest fragments having different size (large, medium, small and Faguense) were obtained. To evaluate the spectral response as a function of elevation, the ASTER GDEM was sliced. To estimate the shadow, green vegetation and non-photosynthetic vegetation (NPV), the linear spectral unmixing model was applied to the Worldview-2 image. The results showed two groups of spectral response. The Faguense forest presented lower reflectance in the NIR band and higher in the red one than the other fragments. This result can indicate more presence of deciduous species, as also deduced from higher NPV fraction values obtained from the linear unmixing model in the Faguense forest. This behavior seems to be related to local topographic conditions because the Faguense forest is located at lower altitudes (420-450m) than the other fragments (510-570m). Further studies based on time series and field inspection for species identification are necessary to confirm this hypothesis.
%9 Floresta e vegetação
%@language pt
%3 p0209.pdf