@Article{LuckmanBakKupYanFre:1997:StReRa,
               author = "Luckman, A. J. and Baker, J. and Kuplich, Tatiana T. and Yanasse, 
                         Corina da Costa Freitas and Frery, Alejandro Cesar",
          affiliation = "RSADU, British National Space Centre, Huntingdon, Cambridgeshire 
                         PE17 2LS, United Kingdom and {} and {} and {} and Departamento de 
                         Informatica, Universidade Federal de Pernambuco, Recife, Brazil",
                title = "A study of the relationship between radar backscatter and 
                         regenerating tropical forest biomass for spaceborne SAR 
                         instruments",
              journal = "Remote Sensing of Environment",
                 year = "1997",
               volume = "60",
               number = "1",
                pages = "1--13",
                month = "Abr.",
             keywords = "PROCESSAMENTO DIGITAL DE IMAGENS, RADAR DE ABERTURA SINTETICA, 
                         SAR, FLORESTA TROPICAL, BIOMASSA, MISSAO SIR-C, ERS 1, JERS 1, 
                         RETROESPALHAMENTO.",
             abstract = "The relationship between mean backscattering coefficient, as 
                         measured by spaceborne SAR instruments, and the areal density of 
                         above-ground biomass in regenerating tropical forest is 
                         investigated for a study area in the central Amazon basin. 
                         Measurements of tree height, diameter, and species composition 
                         were made in 1994 in the Tapajos region of Para State in Brazil in 
                         order to estimate the biomass density in 15 widely distributed 
                         sample plots. These plots were chosen so as to characterize 
                         homogeneous forest areas representing a range of ages of 
                         regeneration from new regrowth to mature forest. The mean 
                         backscattering coefficients of these forest areas, as measured by 
                         SAR instruments on the ERS-1 and JERS-1 satellites and by SIR-C on 
                         the Space Shuttle, was determined so that its dependence on the 
                         biomass density of regenerating forest at different radar 
                         wavelengths and polarizations could be quantified. Results confirm 
                         the findings of similar studies of different types of forest, and 
                         of radar backscatter models, that the longer wavelength 
                         (L-band)SAR imagery may be used to discriminate between different 
                         levels of forest biomass up to a certain threshold and that cross 
                         polarized backscatter is more sensitive to changes in biomass 
                         density. The shorter wavelength (C-band)SAR imagery is limited to 
                         differentiating between vegetation and bare soil when it is dry. 
                         The biomass density limit of around 60 tonnes per hectare, above 
                         which the L-band backscatter shows no further sensitivity to 
                         increased biomass density, suggests that spaceborne SAR imagery is 
                         suitable for estimating the biomass density and determining the 
                         extent of cleared and regenerating forest in tropical regions.",
                  doi = "10.1016/S0034-4257(96)00121-6",
                  url = "http://dx.doi.org/10.1016/S0034-4257(96)00121-6",
                 issn = "0034-4257",
                label = "8322",
             language = "en",
           targetfile = "1997_luckman.pdf",
        urlaccessdate = "03 maio 2024"
}