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A necessidade de planejamento e gerenciamento de bacias hidrograficas tem incitado pesquisa que buscam compreender sua dinâmica hidrologica. Em regioes que apresentam carencia de mapeamento topografico em grande escala, e comum o uso de modelos digitais de elevacao (MDE) para extracao automatica da rede de drenagem, delimitacao de bacias hidrograficas e obtencao de parâmetros hidrograficos e morfometricos. Diante deste cenario o presente trabalho teve como objetivo avaliar a eficiencia de duas ferramentas computacionais (Hydrology e TauDEM) e tres bases de dados (SRTM, AGEDM e AW3D) para a extracao de rede de drenagem e calculo de parâmetros hidrograficos. Concluiu-se que o software TauDEM representa a melhor solucao da extracao de drenagem, pois minimiza a geracao de drenagem retilinea e paralela em areas de relevo plano. Dentre as bases de dados, a drenagem extraida dos dados AW3D apresentaram maior correspondencia com drenagem de referencia do IBGE. De modo geral, os parâmetros morfometricos calculados para a Bacia Hidrografica do Alto Gurgueia (BHAG), a partir das tres bases de dados selecionadas, nao apresentaram diferencas significativas, indicando o potencial das ferramentas e bases de dados para analises hidrograficas de medias e grandes bacias. Em todo caso, recomenda-se a inspecao e correcao manual da rede de drenagem ao aplicar qualquer metodo de extracao automatica, com o intuito de reduzir os erros decorrentes das limitacoes dos softwares. Normal 0 false false false PT-BR X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tabela normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin-top:0in; mso-para-margin-right:0in; mso-para-margin-bottom:8.0pt; mso-para-margin-left:0in; line-height:107%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri",sans-serif; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-ansi-language:PT-BR;} A B S T R A C T The need for planning and management of river basins has prompted research that seek to understand their hydrological dynamics. In regions with lack of topographic mapping on a large scale, it is common to use digital elevation models (DEM) for automatic drainage network extraction, delineation of watersheds and obtain hydrographic and morphometric parameters. Against this background the present study aimed to evaluate the efficiency of two computational tools (Hydrology and TauDEM) and three databases (SRTM, AGEDM and AW3D) for drainage network extraction and calculation of hydrographic parameters. It was concluded that the TauDEM software is the best solution drain extraction, because it minimizes the generation of rectilinear and parallel drainage in flat terrain areas. Among those databases, the drainage extracted of the AW3D data had higher correlation with the IBGE reference drainage. Overall, the morphometric parameters calculated for the basin of the Upper Gurgueia (BHAG), from the three selected databases, no show significant differences, indicating the potential of tools and databases for hydrographic analysis of averages and large basins. In any case, it is recommended to inspection and manual correction of the drainage network when applying any automatic extracting method, in order to reduce errors due to limitations of the software. Keywords: Drainage Neytwork. Digital Elevation Model. Geoprocessing.

Extração Automática de Drenagem: uma Análise Comparativa a Partir de Diferentes Ferramentas e Bases de Dados (Draining automatic extraction: a comparative analysis of different from the tools and databases )