@Article{EpiphanioGlerFormRudo:1996:VeInRe,
               author = "Epiphanio, Jos{\'e} Carlos Neves and Gleriani, Jos{\'e} 
                         Marinaldo and Formaggio, Antonio Roberto and Rudorff, Bernardo 
                         Friedrich Theodor",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {Instituto Nacional de Pesquisas 
                         Espaciais (INPE)}",
                title = "{\'{\I}}ndices de vegeta{\c{c}}{\~a}o no sensoriamento remoto 
                         da cultura do feij{\~a}o. / Vegetation indices for remote sensing 
                         of beans (phaseolus vulgaris L)",
              journal = "Pesquisa Agropecu{\'a}ria Brasileira",
                 year = "1996",
               volume = "31",
               number = "6",
                pages = "445--454",
                month = "Jun.",
             keywords = "radiometria, reflect{\^a}ncia, {\^a}ngulo de visada, {\^a}ngulo 
                         de ilumina{\c{c}}{\~a}o, solo.",
             abstract = "As aplica{\c{c}}{\~o}es de sensoriamento remoto em estudos de 
                         culturas agr{\'{\i}}colas t{\^e}m feito uso extensivo dos 
                         {\'{\i}}ndices de vegeta{\c{c}}{\~a}o (IVs). 
                         Constitu{\'{\i}}dos de duas ou mais bandas, servem para 
                         real{\c{c}}ar as fei{\c{c}}{\~o}es de vegeta{\c{c}}{\~a}o e 
                         ao mesmo tempo minimizar efeitos esp{\'u}rios, como solos ou 
                         efeitos angulares, ou ainda efeitos atmosf{\'e}ricos. N{\~a}o se 
                         formou ainda opini{\~a}o un{\^a}nime sobre as propriedades dos 
                         IVs, ou seja, n{\~a}o existe consenso sobre a 
                         utiliza{\c{c}}{\~a}o dos diversos IVs nas situa{\c{c}}{\~o}es 
                         variadas que existem na natureza. Este trabalho visa fazer uma 
                         avalia{\c{c}}{\~a}o de tr{\^e}s dos mais importantes IVs quanto 
                         a suas varia{\c{c}}{\~o}es, em fun{\c{c}}{\~a}o de tr{\^e}s 
                         par{\^a}metros relevantes em sensoriamento remoto: solos, 
                         {\^a}ngulos de visada e {\^a}ngulos de ilumina{\c{c}}{\~a}o, 
                         num experimento fatorial com feij{\~a}o, em quatro est{\'a}dios 
                         de desenvolvimento. Constatou-se que as influ{\^e}ncias dos 
                         fatores sobre as bandas individuais constituintes dos IVs foram 
                         relevantes na compreens{\~a}o dos efeitos sobre os IVs. Os IVs 
                         apresentaram diferen{\c{c}}as significativas quanto aos solos, 
                         nos quatro est{\'a}dios de crescimento da cultura. J{\'a} o 
                         {\^a}ngulo de visada influenciou de forma significativa o NDVI 
                         ({\'{\i}}ndice de Vegeta{\c{c}}{\~a}o Diferen{\c{c}}a 
                         Normalizada) no est{\'a}dio inicial de crescimento do 
                         feij{\~a}o. Os IVs n{\~a}o foram afetados quanto ao {\^a}ngulo 
                         de ilumina{\c{c}}{\~a}o, quando a cultura cobriu totalmente o 
                         solo. Al{\'e}m disso, houve satura{\c{c}}{\~a}o do NDVI, 
                         enquanto o SAVI ({\'{\i}}ndice de Vegeta{\c{c}}{\~a}o Ajustado 
                         para Solo) e o PVI ({\'{\i}}ndice de Vegeta{\c{c}}{\~a}o 
                         Perpendicular) continuaram a responder aos tratamentos, 
                         principalmente em decorr{\^e}ncia de suas sensibilidades ao 
                         infravermelho. ABSTRACT: Vegetation indices (VIs)are an important 
                         tool in remote sensing of vegetation. These VIs are composed of 
                         two or more single bands and they are supposed to minimize some 
                         intervening effects such as soil background, view and illumination 
                         angles and atmospheric effects. However, there is a lack of 
                         knowledge on how different VIs behave on a developing crop over 
                         different soils and submitted to different viewing conditions; the 
                         exact role the bands play in the VIs under those conditions is to 
                         be understood. This paper describes an experiment in which bean 
                         (Phaseolus vulgaris L.)was planted on the same soil, but in a 
                         changing three soil backgrounds, under two view angles and four 
                         times of the day, in four dates along the crop cycle, and in 
                         randomly blocks design. It is shown that the analysis of 
                         individual bands is very important for understanding the behavior 
                         of VIs. Soils were statistically significant in all stages 
                         analyzed for the three VIs; however, the view angle was 
                         significant only for NDVI and for low ground cover. The 
                         illumination angle was significant for all VIs and for all ground 
                         covers, except for 100. Moreover, there was an expected NDVI 
                         saturation as the ground cover increased while the SAVI and PVI 
                         keep on responding to treatments, mainly in function of their 
                         sensitivities to near inf.",
           copyholder = "SID/SCD",
                 issn = "0100-204X",
                label = "7759",
             language = "pt",
           targetfile = "4503-17825-1-PB.pdf",
        urlaccessdate = "16 jun. 2024"
}