@InProceedings{MaireMPVSBSN:2011:CaVeIn,
               author = "Maire, Guerric le and Marsden, Claire and Ponzoni, Fl{\'a}vio 
                         Jorge and Verhoef, Wouter and Seen, Danny Lo and B{\'e}gu{\'e}, 
                         Agn{\`e}s and Stape, Jos{\'e}-Luiz and Nouvellon, Yann",
          affiliation = "CIRAD, Persyst, UPR 80 and CIRAD, Persyst, UPR 80 and {Instituto 
                         Nacional de Pesquisas Espaciais – INPE} and Faculty of 
                         Geo-Information Science and Earth Observation (ITC) University of 
                         Twente, Enschede, The Netherlands and CIRAD, UMR TETIS and CIRAD, 
                         UMR TETIS and Department of Forestry and Environmental Sciences 
                         North Carolina State University, Raleigh, NC 27695, United States 
                         and Departamento de Ci{\^e}ncias Atmosf{\'e}ricas, IAG 
                         Universidade de S{\~a}o Paulo, Brazil",
                title = "Calibration of a vegetation index to monitor Eucalyptus plantation 
                         leaf area index with MODIS reflectance time-series",
            booktitle = "Anais...",
                 year = "2011",
               editor = "Epiphanio, Jos{\'e} Carlos Neves and Galv{\~a}o, L{\^e}nio 
                         Soares",
                pages = "1811--1819",
         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",
             keywords = "remote sensing, eucalypt, MOD13Q1, radiative transfer model, 
                         PROSAIL.",
             abstract = "Leaf area index (LAI) of Eucalyptus plantations is an important 
                         variable, linked to different biophysical processes: carbon 
                         assimilation, water consumption, litter production, etc. 
                         Eucalyptus LAI is highly variable in time throughout the stand 
                         rotation. After planting, LAI increases rapidly to reach a maximum 
                         value at the age of about 2 years. Then LAI fluctuates seasonally, 
                         with a small decrease with stand age, till the clear-cut which 
                         occurs at age 6-7. In addition to these variations with time, 
                         differences in space may arise from local soil and meteorological 
                         conditions. In this study, we propose a method to retrieve spatial 
                         and temporal values of Eucalyptus stand LAI during entire 
                         rotations based on Moderate Resolution Imaging Spectroradiometer 
                         (MODIS) near-infrared and red reflectance time-series. This work 
                         capitalizes on a recently published methodology based on radiative 
                         transfer model (RTM) inversion, which achieved good LAI retrieval 
                         results (r2=0.80, RMSE= 0.41) but was computationally intensive. 
                         We propose here to use the radiative transfer model results to 
                         calibrate a dedicated Eucalyptus plantation vegetation index which 
                         would give a similar result to RTM inversion, but in a simpler 
                         way. This vegetation index takes the form of a soil adjusted 
                         vegetation index. When using only red and NIR reflectance, r2 is 
                         0.68 and RMSE is 0.49 on an independent validation dataset of 
                         destructive LAI measurements. The additional use of stand age and 
                         day of year increases the performance of the index (r2=0.75 and 
                         RMSE=0.43). This simple index opens the way to the operational 
                         retrieval of Eucalyptus LAI from MODIS data.",
  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/39UF6NP",
                  url = "http://urlib.net/ibi/3ERPFQRTRW/39UF6NP",
           targetfile = "p0291.pdf",
                 type = "An{\'a}lise Florestal e Vegeta{\c{c}}{\~a}o",
        urlaccessdate = "28 abr. 2024"
}