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The center pivot irrigation in Minas Gerais state, Brazil, under the optics of Google Earth EDUARDO PINHEIRO DE FREITAS 1 AND WAGNER ALVES DE ANDRADE 2 1 IFSP campus Barretos, Barretos – SP, Brazil. E-mail: eduardo.freitas@ifsp.edu.br 2 UCS, Caxias do Sul - RS, Brazil. E-mail: vaguinho.a@hotmail.com 1 Abstract The Southeast region has the highest water demand and the largest irrigated area in Brazil, with emphasis on the central pivots in the state of Minas Gerais. However, the reliability of this information is poor, which limits its use to such management. As an alternative to obtain more consistent data, especially regarding central pivots, there is the use of remote sensing with satellite images to the mapping of irrigated areas in spatial and temporal scales, with some technical and financial difficulties as barriers. Google Earth solves part of these barriers, but the temporal discontinuity is a point to be evaluated. In this context, this work aimed to use Google Earth to visually identify areas irrigated by center pivot in Minas Gerais, from an overflight in the state at an altitude of the viewpoint of 4,000 meters, characterize and register them, which resulted in 4,607 areas totaling 295,059.76 ha, with the municipality of Paracatu presenting the largest number with 598 areas, and Unai, the greatest extent, with 42,846.04 ha. Data available in the literature of 2010 indicated 4,432 areas occupying 303,368 ha with 570 areas in Paracatu and 44,258 ha in Unai, confirming the functionality of the method. Keywords: GIS, water resources, remote sensing . FREITAS, E. P. DE; ANDRADE, w. a. DE A irrigacao por pivo central no estado de Minas Gerais, Brasil, sob a optica do Google Earth 2 Resumo A regiao Sudeste tem a maior demanda de agua no Brasil e a maior extensao irrigada, com destaque para os pivos centrais no estado de Minas Gerais, contudo, a confiabilidade destas informacoes e precaria e limitam seu uso para a referida gestao. Como opcao a obtencao de dados mais consistentes, principalmente quanto aos pivos centrais, tem-se a utilizacao do sensoriamento remoto com imagens de satelites para o mapeamento em escalas espacial e temporal, tendo como entraves algumas dificuldades tecnicas e financeiras. O Google Earth soluciona parte destes entraves, tendo na descontinuidade temporal um dos pontos a ser avaliado. Neste contexto, o presente trabalho teve como objetivo utilizar o Google Earth para identificar visualmente areas irrigadas por pivo central em Minas Gerais, a partir de um sobrevoo no estado a uma altitude do ponto de visao de 4000 metros, caracteriza-las e cadastra-las, o que resultou em 4607 areas que totalizaram 295059,76 ha, com o municipio de Paracatu apresentando o maior numero, com 598 areas, e Unai a maior extensao, com 42846,04 ha. Dados disponiveis do ano de 2010 indicam 4432 areas ocupando 303368 ha, com 570 areas em Paracatu e 44258 ha em Unai, ratificando a funcionalidade do metodo. Palavras-chave: SIG, recursos hidricos, sensoriamento remoto.

THE CENTER PIVOT IRRIGATION IN MINAS GERAIS STATE, BRAZIL, UNDER THE OPTICS OF GOOGLE EARTH