@Article{ValerianoRoss:2020:DeMaRe,
               author = "Valeriano, M{\'a}rcio de Morisson and Rossetti, Dilce de 
                         F{\'a}tima",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)}",
                title = "Delineation of main relief subdomains of central Amazonia for 
                         regional geomorphometric mapping with SRTM data",
              journal = "Journal of South American Earth Sciences",
                 year = "2020",
               volume = "104",
                pages = "e102842",
                month = "Dec.",
             keywords = "DEM, Central Amazonia, Specific geomorphometry, Relief mapping.",
             abstract = "The geomorphometric characterization of central Amazonia reliefs 
                         is specially challenging because of its large dimension and rather 
                         uniform low topography of sedimentary units. In such conditions, 
                         usual techniques applied for general geomorphometry are 
                         ineffective and thus disabling direct bottom-up approaches for 
                         delimitations. Specific geomorphometry is a more promising 
                         approach for terrain analysis in this area, since procedures can 
                         be adapted to analyze the particular features of each 
                         geomorphological context. Therefore, delimitation of subdomains is 
                         a requirement for specific geomorphometry, to address proper 
                         approaches in the different strata. This paper presents a first 
                         level delimitation of major subdomains of Central Amazonia, 
                         carried out through combined techniques of geoprocessing guided by 
                         visual assessment. The three targeted subdomains, floodplains, 
                         plateau and highland, were mapped at the 1:2,000,000 scale using 
                         SRTM and derivative data as inputs. The relief of highland, as 
                         influenced by Precambrian to Cretaceous basement rocks, was 
                         firstly delimited using mostly height and relative relief 
                         combinations. The partition of the remaining lowland area into 
                         plateaus (Neogene) and floodplains (Quaternary sediments) was 
                         based on residual relief (subtraction of regional relief from full 
                         detail elevation data), with a regional relief modeled as the 9th 
                         order trend surface of elevations. Thresholds of negative residues 
                         were determined to create extents of visually assessed boundaries 
                         between plateau and floodplain areas. The continuous visual 
                         supervision of procedures and concerning interventions were based 
                         on interpretation of output displays of DEM and derived data 
                         prepared with image processing techniques. Delineation of 
                         subdomains was implemented through steps of supervised 
                         classifications and map algebra to operationally enable the task 
                         over the full area extension and corresponding data volume. 
                         Observation of data combined with knowledge and conceptual inputs 
                         were decisive to provide useful and unambiguous criteria to choose 
                         specific variables and analyses along this development.",
                  doi = "10.1016/j.jsames.2020.102842",
                  url = "http://dx.doi.org/10.1016/j.jsames.2020.102842",
                 issn = "0895-9811",
             language = "en",
           targetfile = "valeriano-delineatrion.pdf",
        urlaccessdate = "27 abr. 2024"
}