Estimative of the emissivity to determine the temperature of sugarcane (Saccharum spp.) canopy using AVHRR-NOAA data

Author(s)

Carlos Alberto Soares de Almeida

• Document type: Doctoral Thesis
• Press: Campinas, SP.
• Institution: Universidade Estadual de Campinas (UNICAMP). Faculdade de Engenharia Agricola
• Defense date: 2001-07-31

Examining board members

Hilton Silveira Pinto; Eduardo Assad; Pedro Luiz Donzelli; Jurandir Zullo Junior; Maria Ângela Fagnani

• Advisor: Hilton Silveira Pinto

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 (AU)