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@Article{MoulatletRenCosEmiSch:2015:GrVaSu,
               author = "Moulatlet, G. M. and Renn{\'o}, Camilo Daleles and Costa, F. R. 
                         C. and Emilio, T. and Schietti, J.",
          affiliation = "{University of Turku} and {Instituto Nacional de Pesquisas 
                         Espaciais (INPE)} and {Instituto Nacional de Pesquisas da 
                         Amaz{\^o}nia (INPA)} and {Instituto Nacional de Pesquisas da 
                         Amaz{\^o}nia (INPA)} and {Instituto Nacional de Pesquisas da 
                         Amaz{\^o}nia (INPA)}",
                title = "Mapping hydrological environments in central Amazonia: ground 
                         validation and surface model based on SRTM DEM data corrected for 
                         deforestation",
              journal = "Earth System Science Data",
                 year = "2015",
               volume = "7",
                pages = "29--34",
             abstract = "One of the most important freely available digital elevation 
                         models (DEMs) for Amazonia is the one obtained by the Shuttle 
                         Radar Topography Mission (SRTM). However, since SRTM tends to 
                         represent the vegetation surface instead of the ground surface, 
                         the broad use of SRTM DEM as a framework for terrain description 
                         in Amazonia is hampered by the presence of deforested areas. We 
                         present here two data sets: (1) a deforestation-corrected SRTM DEM 
                         for the interfluve between the Purus and Madeira rivers, in 
                         central Amazonia, which passed through a careful identification of 
                         different environments and has deforestation features corrected by 
                         a new method of increasing pixel values of the DEM (Renn{\'o}, 
                         2009); and (2) a set of 18 hydrological-topographic descriptors 
                         based on the corrected SRTM DEM. Deforestation features are 
                         related with the opening of an 800 km road in the central part of 
                         the interfluve and occupancy of its vicinity. We used topographic 
                         profiles from the pristine forest to the deforested feature to 
                         evaluate the recovery of the original canopy coverage by 
                         minimizing canopy height variation (corrections ranged from 1 to 
                         38 m). The hydrologicaltopographic description was obtained by the 
                         Height Above the Nearest Drainage (HAND) algorithm, which 
                         normalizes the terrain elevation (above sea level) by the 
                         elevation of the nearest hydrologically connected drainage. The 
                         validation of the HAND data set was done by in situ hydrological 
                         description of 110 km of walking trails also available in this 
                         data set. The new SRTM DEM expands the applicability of SRTM data 
                         for landscape modelling; the data sets of hydrological features 
                         based on topographic modelling are undoubtedly appropriate for 
                         ecological modelling and an important contribution to 
                         environmental mapping of Amazonia. The deforestation-corrected 
                         SRTM DEM is available at 
                         http://ppbio.inpa.gov.br/knb/metacat/naman.318.3/ppbio; the 
                         polygons selected for deforestation correction are available at 
                         http://ppbio.inpa.gov.br/knb/metacat/naman.317.3/ppbio; the set of 
                         hydrologicaltopographic descriptors is available at 
                         http://ppbio.inpa.gov.br/knb/metacat/naman.544.2/ppbio; the 
                         environmental description of access trails is available at 
                         http://ppbio.inpa.gov.br/knb/metacat/naman.541.2/ppbio; and the 
                         limits of deforestation corrections and drainage validation are 
                         available at 
                         http://ppbio.inpa.gov.br/knb/metacat/liliandias.38.1/ppbio.",
                  doi = "10.5194/essd-7-29-2015",
                  url = "http://dx.doi.org/10.5194/essd-7-29-2015",
                 issn = "1866-3508 and 1866-3516",
             language = "en",
        urlaccessdate = "02 dez. 2020"
}


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