文章基本信息

标题：ANÁLISE DOS EFEITOS DE GEADAS NA COBERTURA VEGETAL DO MUNICÍPIO DE CÂNDIDO MOTA – SP, BRASIL, POR MEIO DE ÍNDICES DE VEGETAÇÃO
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作者：Julio Cesar Demarchi ; Edson Luís Piroli
期刊名称：Boletim Goiano de Geografia
印刷版ISSN：0101-708X
电子版ISSN：1984-8501
出版年度：2015
卷号：35
期号：3
页码：554-573
语种：Portuguese
出版社：Universidade Federal de Goiás
摘要：Frosts affect negatively the agricultural production and, consequently, the society and economy by decreasing productivity and creasing in food prices. This paper aimed to analyze the effects of the frosts occurred on June 28th and on August 4th, 2011, in the city of Cândido Mota, São Paulo state, by means of vegetation indices, such as Normalized Difference Vegetation Index (NDVI) and Normalized Difference Water Index (NDWI). Also, it verifies the influence of altitude in the intensity of this climatic phenomenon and their effects in vegetation cover and some agricultural crops, and evaluates the effectiveness of these indices in detecting changes caused by frosts in vegetation cover. The NDVI and NDWI “difference images” of previous and posterior dates to the first and the second frosts and the zonal analysis pointed out that the main affected crops were: winter corn, barley, wheat and sugarcane. The effect of the frosts was higher in medium altitudes (400 to 500 m). The indices NDVI and NDWI had similar performance in detecting the effect of frosts in vegetation cover, although they have been designed for different purposes. Keywords: NDVI, NDWI, altitude, remote sensing.