author = "Valeriano, M{\'a}rcio de Morisson and Kuplich, Tatiana Mora and 
                         Storino, Mois{\'e}s and Amaral, Benedito Domingues do and Mendes 
                         J{\'u}nior, Jaime Nogueira and Lima, Dayson Jardim",
          affiliation = "INPE and INPE and IAC and UNESP and UNICAMP and INPE",
                title = "Modeling small watersheds in Brazilian Amaz{\^o}nia with SRTM-90m 
              journal = "Computers and Geosciences",
                 year = "2006",
               volume = "32",
               number = "8",
                pages = "1169--1181",
                month = "Outubro",
             keywords = "Geoprocessing, SRTM, Watershed, Amazonia.",
             abstract = "This work presents a methodology for the refinement of SRTM 
                         (Shuttle Radar Topographic Mission)-90m data available for South 
                         America to enable detailed watershed studies in Amazonia. The 
                         original data were pre-processed to properly map detailed 
                         low-order drainage features and allowed digital estimates of 
                         morphometric variables. Spatial resolution refinement (3o to 1o, 
                         or ~90m to ~30m) through data kriging was found to be an 
                         interesting solution to construct Digital Elevation Models (DEM) 
                         with more adequate presentation of land forms than the original 
                         data. The refinement of spatial resolution by kriging 
                         interpolation overcame the main constraints for drainage modeling 
                         with original SRTM-90m, such as spatial randomness, artifacts and 
                         unrealistic presentation due to pixel size. Kriging with Gaussian 
                         semivariogram model caused a smoothing of the resulting DEM, but 
                         the main features for drainage modeling were preserved. Canopy 
                         effects on the modeled surface represented the main remaining 
                         limitation for terrain analysis after pre-processing. Data 
                         regarding a small watershed in Amazonas (~38km2), Brazil, were 
                         evaluated through visualization techniques, morphometric analyses 
                         and plot diagrams of the results. The data showed limitations for 
                         use in the original form, but could be applied for watershed 
                         modeling at relatively detailed scales after the described 
           copyholder = "SID/SCD",
                 issn = "0098-3004",
                label = "self-archiving-INPE-MCTIC-GOV-BR",
             language = "en",
           targetfile = "article.pdf",
        urlaccessdate = "2020, Oct. 24"