@TechReport{ValerianoPere:1988:CoFiCe,
               author = "Valeriano, Dalton de Morisson and Pereira, Marisa Dantas B",
                title = "Correlacao de fitomassa de cerrado com indices vegetativos 
                         calculados com dados obtidos pelos sistemas MSS-TM/Landsat",
          institution = "INPE",
                 year = "1988",
                 type = "PRP",
               number = "INPE-5610-PRP/186",
              address = "Sao Jose dos Campos",
             keywords = "vegeta{\c{c}}{\~a}o, vegetation.",
             abstract = "Spectral reflectance measurementes of 47 1m2 plots of the ground 
                         layer of the Savana of Central Brazil were obtained using a Kimoto 
                         PM-12A hand-held radiometer at 13 visible bands and at 4 
                         near-infrared bands. The aboveground phytomass of each plot was 
                         clipped, weighted, oven dried and weighted again. An amount of the 
                         fresh phytomass (5-15) was separated from each sample in order to 
                         estimate the proportion of the photosynthetically active 
                         phytomass. The correlation and regression relationships between 
                         the reflectance and phytomass data were examined. The results are: 
                         a)fresh and dry total phytomass showed negative correlations for 
                         all spectral bands, with highest r2 at = 575 nm; b)fresh and dry 
                         green phytomass presented negative correlations for all visible 
                         bands and positive for near infrared bands; c)fresh phytomass 
                         (both total and green)shows higher r2 than dry phytomass; d)the 
                         water contents of the total and of the green phytomass present 
                         negative correlations with the spectral reflectance in the 
                         blue-green spectrum and positive correlations in the 
                         near-infrared; d)the bands that present the best positive and 
                         negative correlations were combined to generate vegetation indices 
                         for the estimation of the green phytomass and the water content. 
                         The transformed normalized difference developed for the estimation 
                         of the total water content was the index which presented the best 
                         correlation (r = 0,64). Resumo Measurementes reflect{\^a}ncia 
                         espectral de 47 parcelas de 1m2 a camada de solo da Savana do 
                         Brasil Central foram obtidas utilizando um radi{\^o}metro Kimoto 
                         PM-12A m{\~a}o-realizada em 13 bandas vis{\'{\i}}veis e em 4 
                         bandas do infravermelho pr{\'o}ximo. A fitomassa da parte 
                         a{\'e}rea de cada parcela foi cortada, ponderada, seco em estufa 
                         e pesado novamente. Uma quantidade da fitomassa fresco (5-15) foi 
                         separada a partir de cada amostra, a fim de estimar a 
                         propor{\c{c}}{\~a}o da fitomassa fotossinteticamente activa. As 
                         rela{\c{c}}{\~o}es de correla{\c{c}}{\~a}o e regress{\~a}o 
                         entre os dados de reflect{\^a}ncia e fitomassa foram examinados. 
                         Os resultados s{\~a}o: a) total de fitomassa fresca e seca 
                         mostrou correla{\c{c}}{\~o}es negativas para todas as bandas 
                         espectrais, com maior r2 = a 575 nm; b) fitomassa verde fresca e 
                         seca apresentou correla{\c{c}}{\~o}es negativas para todas as 
                         bandas vis{\'{\i}}veis e positivos para as bandas de 
                         infravermelho pr{\'o}ximo; c) fitomassa fresca (tanto total e 
                         verde) mostra r2 mais elevados do que fitomassa seca; d) o 
                         conte{\'u}do de {\'a}gua do total e da fitomassa verde 
                         apresentam correla{\c{c}}{\~o}es negativas com a 
                         reflect{\^a}ncia espectral no espectro azul-verde e 
                         correla{\c{c}}{\~o}es positivas no infravermelho pr{\'o}ximo; 
                         d) as bandas que apresentam as melhores correla{\c{c}}{\~o}es 
                         positivas e negativas foram combinados para gerar {\'{\i}}ndices 
                         de vegeta{\c{c}}{\~a}o para a estimativa da fitomassa verde e do 
                         teor de {\'a}gua. A diferen{\c{c}}a normalizada transformado 
                         desenvolvido para a estimativa do teor total de {\'a}gua foi o 
                         {\'{\i}}ndice que apresentou a melhor correla{\c{c}}{\~a}o (r 
                         = 0,64).",
                label = "6993",
             language = "pt",
                pages = "73",
                  ibi = "6qtX3pFwXQZ3r59YD6/GNnJF",
                  url = "http://urlib.net/ibi/6qtX3pFwXQZ3r59YD6/GNnJF",
        urlaccessdate = "10 maio 2024"
}