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@InProceedings{CigandaGite:2011:ReDeUn,
               author = "Ciganda, Ver{\'o}nica Solange and Gitelson, Anatoly",
          affiliation = "{Instituto Nacional de Investigaci{\'o}n Agropecuaria (INIA)} and 
                         {Center for Advanced Land Management Information Technology 
                         (CALMIT)}",
                title = "Effect of the Vertical Profile of Chlorophyll on Maize Canopy 
                         Reflectance: Remote Determination under Field Conditions",
            booktitle = "Anais...",
                 year = "2011",
               editor = "Epiphanio, Jos{\'e} Carlos Neves and Galv{\~a}o, L{\^e}nio 
                         Soares",
                pages = "638--646",
         organization = "Simp{\'o}sio Brasileiro de Sensoriamento Remoto, 15. (SBSR).",
            publisher = "Instituto Nacional de Pesquisas Espaciais (INPE)",
              address = "S{\~a}o Jos{\'e} dos Campos",
             abstract = "The chlorophyll (Chl) content of a crop canopy is a biophysical 
                         variable that quantitatively expresses the photosynthetic capacity 
                         of a vegetation stand and it is related to many important plant 
                         functions and parameters. Therefore, it is not surprising that 
                         many remote sensing studies have focused on the estimation of Chl 
                         content of vegetation canopies to asses the vitality of plants and 
                         to detect vegetation stress. However, there is little information 
                         regarding how the distribution of Chl within vegetation canopies 
                         defines the reflectance signatures measured remotely and the 
                         derived spectral indexes. The goal of this study was to determine 
                         how deep into a maize canopy, a spectral vegetation index, based 
                         on the red edge and NIR spectral bands, senses the Chl content of 
                         individual leaves. Reflectance was measured using a hand-held 
                         radiometer at both the leaf and canopy level in order to retrieve 
                         foliar and total canopy Chl content, respectively. A hierarchical 
                         regression analysis was used to find (i) how many maize leaves 
                         contribute significantly to total canopy Chl content, and (ii) how 
                         many leaves, from top to bottom, are sensed by a field radiometer 
                         and by the red edge chlorophyll index, CIred edge . Results showed 
                         that CIred edge senses the chlorophyll content of the top 7 to 8 
                         leaves in the maize canopy and, thus, is able to accurately 
                         estimate total chlorophyll content in canopy.",
  conference-location = "Curitiba",
      conference-year = "30 abr. - 5 maio 2011",
                 isbn = "{978-85-17-00056-0 (Internet)} and {978-85-17-00057-7 (DVD)}",
             language = "en",
         organisation = "Instituto Nacional de Pesquisas Espaciais (INPE)",
                  ibi = "3ERPFQRTRW/39UFGDQ",
                  url = "http://urlib.net/rep/3ERPFQRTRW/39UFGDQ",
           targetfile = "p0286.pdf",
                 type = "Agricultura",
        urlaccessdate = "18 jan. 2021"
}


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