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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Estimativa da emissividade para a determinação da temperatura do dossel de cana-de-açucar (Saccharum spp.) utilizando dados AVHRR-NOAA / Estimative of the emissivity to determine the temperature of sugarcane (Saccharum spp.) canopy using AVHRR-NOAA data

Almeida, Carlos Alberto Soares de 31 July 2001 (has links)
Orientador: Hilton Silveira Pinto / Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Agricola / Made available in DSpace on 2018-08-06T03:42:16Z (GMT). No. of bitstreams: 1 Almeida_CarlosAlbertoSoaresde_D.pdf: 685356 bytes, checksum: 3eb22116a96bd0f7b5643e5620f19c26 (MD5) Previous issue date: 2001 / Resumo: Foram utilizadas séries de imagens diurnas e noturnas captadas pelos sensores AVHRR a bordo do satélite NOAA-14 para a obtenção dos valores finais de temperatura de superfície do dossel vegetativo. O processamento das imagens incluiu o geo-referenciamento e as correções quanto aos efeitos atmosféricos e de emissividade, para as quais se utilizou o método de correção split window. A equação de split window usada considerou o parâmetro de emissividade da superfície cultivada estimada diretamente no campo pelo método da caixa. Este método foi comparado a um método alternativo de estimativa de emissividade no campo baseado na proporção de cobertura vegetal e solo descoberto. Os dois métodos apresentaram resultados equivalentes quanto à estimativa de emissividade da superfície. A alta correlação entre a temperatura de superfície medida no campo e a obtida a partir das imagens indicou que as equações de split window usadas corrigiram satisfatoriamente as imagens quanto aos efeitos atmosféricos e de emissividade / Abstract: Diurnal and nocturnal image series have been used in this work. These images were processed on suitable software to the treatment of NOAA-AVHRR products, for Surface temperature final value obtaining. The processing work includes both the images geo-referencing and their atmospheric correction applying the "split window method". The split window equation used takes into account the crop surface emissivity parameter, estimated directly on the field by the "box method". This one was compared to an alternative emissivity estimate on the field method, which is based on the crop covering/bared soil relation. Both methods when compared presented similar results. A terrestrial radiometer was used to the surface temperature measurements carried out in situ, during the satellite passes. The correct surface temperature satellite data were submitted to a regression analysis against the terrestrial data about the same parameter. High association level between surface temperature measured at the field and the near air temperature was observed. The high correlation between surface temperature measured at the field and that one from the images shown that the split window equation corrected satisfactorily the atmosphere effects over the images / Doutorado / Agua e Solo / Doutor em Engenharia Agrícola

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