Data/hora: 24/06/2024 14:21:34

Biblioteca(s): 	Embrapa Unidades Centrais.	
Data corrente: 	04/09/2001	
Data da última atualização: 	10/12/2018	
Autoria: 	FORMAGGIO, A. R.; EPIPHANIO, J. C. N.; SIMÕES, M. dos S.	
Afiliação: 	Antonio Roberto Formaggio, Instituto Nacional de Pesquisas Espaciais - INPE/Divisão de Sensoriamento Remoto; José Carlos Neves Epiphanio, Instituto Nacional de Pesquisas Espaciais - INPE/Divisão de Sensoriamento Remoto; Maurício dos Santos Simões, Instituto Nacional de Pesquisas Espaciais - INPE/Divisão de Sensoriamento Remoto.	
Título: 	Radarsat backscattering from an agricultural scene.	
Ano de publicação: 	2001	
Fonte/Imprenta: 	Pesquisa Agropecuária Brasileira, Brasília, DF, v. 36, n. 5, p. 823-30, maio 2001	
Idioma: 	Inglês	
Notas: 	Título em português: Retroespalhamento de uma cena agrícola em imagem de radar.	
Conteúdo: 	Orbital remote sensing in the microwave electromagnetic region has been presented as an important tool for agriculture monitoring. The satellite systems in operation have almost all-weather capability and high spatial resolution, which are features appropriated for agriculture. However, for full exploration of these data, an understanding of the relationships between the characteristics of each system and agricultural targets is necessary. This paper describes the behavior of backscattering coefficient (so) derived from calibrated data of Radarsat images from an agricultural area. It is shown that in a dispersion diagram of so there are three main regions in which most of the fields can be classified. The first one is characterized by low backscattering values, with pastures and bare soils; the second one has intermediate backscattering coefficients and comprises well grown crops mainly; and a third one, with high backscattering coefficients, in which there are fields with strong structures causing a kind of double bounce effect. The results of this research indicate that the use of Radarsat images is optimized when a multitemporal analysis is done making the best use of the agricultural calendar and of the dynamics of different cultures.	
Palavras-Chave: 	Farmland; Terras agricolas.	
Thesagro: 	Radar; Sensoriamento Remoto; Uso da Terra.	
Thesaurus Nal: 	land use; remote sensing.	
Categoria do assunto: 	--	
URL: 	http://ainfo.cnptia.embrapa.br/digital/bitstream/AI-SEDE/19130/1/pab0823.pdf	
Registro original: 	Embrapa Unidades Centrais (AI-SEDE)	
Exemplares: 	AI-SEDE - (19130-1) - UPE - AP - PP - 630.72081 - P474 - 630.7208 - DIS