Caracterização espectral e identificação de áreas afetadas pela seca de ponteiros do eucalipto do Vale do Rio Doce (SPEVRD) com ênfase em dados orbitais TM/Landsat / Spectral characterization and identification of effected areas of eucalyptus dyeback in the Rio Doce Valley (SPEVRD)with emphasis on orbital TM/Landsat data

AUTOR(ES)
DATA DE PUBLICAÇÃO

1988

RESUMO

A remote sensing methodology was applied to spectrally characterize euçalyptus dyeback in the Rio Doce Valley (SPEVRD), Minas Gerais State. Spectroradiometric data, 35mm color and color infrared aerial photography and TM/LANDSAT data were used to that characterization. Significant spectral differences between healthy and damaged samples were verified through spectroradiometric analysis. Both color infrared aerial photographs allowed the identification of eucalyptus dyeback, however the latter presented the best performance. TM/LANDSAT data were submitted to different types of digital processing such as: suppression of atmospheric effects, contrast strech, band ratio and principal component transformation. TM wave bands were also statistically analysed to define the best product to discriminate between healthy and damaged eucalyptus. The results showed the following decreasing performance for the individual bands: 4, 3, 1, 5, 2, 7. TM4/TM3 ,ratio however, proved to be better than the best ,individual TM band. A qualitative analysis of PC2 showed that this product provided the best visual discrimination capability between healthy and damaged eucalyptus. The study led to the following conclusions: the methodology is suitable for eucalyptus dyeback characterization in flat terrain; results discouraged the application of this methodology in montaneous region.

ASSUNTO(S)

seca mapeador temÁtico (landsat) satÉlites landsat eucalyptus crop identification identificaÇÃo de cultura florestas atmospheric correction eucaliptos forests image processing fotografia aÉrea anÁlise estatÍstica processamento de imagens aerial photography vegetaÇÃo vale do rio doce (mg) landsat satellites dry correÇÃo atmosfÉrica thematic mappers (landsat)

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