Utilização de imagem de coerência SAR para classificação do uso da terra: Floresta Nacional do Tapajós / Use of SAR coherence image for land cover classification: Tapajós National Forest

AUTOR(ES)
DATA DE PUBLICAÇÃO

2002

RESUMO

The use of optical remote sensing images is not adequate for land cover classifying in tropical environments, due to the constant presence of clouds. The SAR images may be used under any weather and visibility conditions; however, the C-band SAR images have not been considered proper for performing the mapping of forest regions on account of the fact that their wavelength is around the greatness of the leaves from the trees, which increases the speckle phenomenon. This work aims to analyze the potentialities of the use of the coherence images as an alternative for making the classification of the forested areas of tropical regions in the C-band. The use of coherence images is justified by the fact that a low coherence is expected in forest regions, when compared to regions containing sparse vegetation and bare soil. The coherence image of the National Forest of Tapajós has been used, which was obtained from the images captured by the satellites ERS-1/2 in the tandem mode. In order to make the comparison of the results, the amplitude image of the same scene, acquired by the satellite ERS-1 was used, as well as a texture band selected from the 14 Haralick features. Statistical tests based upon Kappa statistics were used to test the precision and the significance of the results.

ASSUNTO(S)

ers 2 classificação de imagens ers 1 coerência modas condicionais iterativas(icm) radar de abertura sintética florestas tropicais

ACESSO AO ARTIGO

Documentos Relacionados