@Article{LibonatiCamaPerePere:2010:ReMiRe,
               author = "Libonati, Renata and Camara, Carlos C. and Pereira, Jose Miguel 
                         and Peres, Leonardo",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and University 
                         of Lisbon, IDL/CGUL, Lisbon, Portugal and School of Agronomy, 
                         Technical University of Lisbon, Lisbon, Portugal and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)}",
                title = "Retrieving middle-infrared reflectance for burned area mapping in 
                         tropical environments using MODIS",
              journal = "Remote Sensing of Environment",
                 year = "2010",
               volume = "114",
               number = "4",
                pages = "831--843",
                month = "Apr.",
                 note = "{} and b School of Agronomy, Technical University of Lisbon, 
                         Lisbon, Portugal and c Center for Weather Forecast and Climate 
                         Studies, Brazilian National Institute for Space Research, 
                         Cachoeira Paulista, Brazil",
             keywords = "land surface, emissivity, radiation, aerosol.",
             abstract = "The ephemeral character of the radiative signal together with the 
                         presence of aerosols imposes severe limitations on the use of 
                         classical approaches, e.g. based on red and near-infrared, to 
                         discriminate between burned and unburned surfaces in tropical 
                         environments. Surface reflectance in the middle-infrared (MIR) has 
                         been used to circumvent these difficulties because the signal is 
                         virtually unaffected by the presence of aerosols associated to 
                         biomass burning. Retrieval of the MIR reflected component from the 
                         total signal is, however, a difficult problem because of the 
                         presence of a diversity of radiance sources, namely the surface 
                         reflected solar irradiance and the surface emitted radiance that 
                         may reach comparable magnitude during daytime. The method proposed 
                         by Kaufman and Remer (1994) to retrieve surface MIR reflectance 
                         presents the advantage of not requiring auxiliary datasets (e.g. 
                         atmospheric profiles) nor major computational means (e.g. for 
                         solving radiative transfer models). Nevertheless, the method was 
                         specifically designed to retrieve MIR reflectance over dense dark 
                         forests in the middle latitudes and, as shown in the present 
                         study, severe problems may arise when applying it beyond the range 
                         of validity, namely for burned area mapping in tropical 
                         environments. The present study consists of an assessment of the 
                         performance of the method for a wide range of atmospheric, 
                         geometric and surface conditions and of the usefulness of 
                         extracted surface reflectances for burned area discrimination. 
                         Results show that, in the case of tropical environments, there is 
                         a significant decrease in performance of the method for high 
                         values of land surface temperature, especially when associated 
                         with low sun elevation angles. Burned area discrimination is 
                         virtually impaired in such conditions, which are often present 
                         when using data from instruments on-board polar orbiters, namely 
                         MODIS in Aqua and Terra, to map burned surfaces over the Amazon 
                         forest and {"}cerrado{"} savanna regions. (C) 2009 Elsevier Inc. 
                         All rights reserved.",
                  doi = "10.1016/j.rse.2009.11.018",
                  url = "http://dx.doi.org/10.1016/j.rse.2009.11.018",
                 issn = "0034-4257",
             language = "en",
           targetfile = "peres 2010.pdf",
        urlaccessdate = "03 maio 2024"
}