ACCURACY OF DIGITAL ELEVATION MODELS FOR THE MORPHOMETRIC ANALYSIS OF WATERSHEDS
Samuel Dias Santos; Maria Otávia Silva Crepaldi; Leonardo Thompson da Silva; Allívia Rouse Carregosa Rabbani
IMPORTANCE OF DIGITAL ELEVATION MODELS IN THE WATERSHED ANALYSIS
W
ater resource management is a landscape management tool and watersheds are primary units of interven ion and analysis (GUERRA; GUERRA, 2003; TRAJANO et al., 2012; DUFFY et al., 2018). E fec ive watershed management requires accurate informa ion on drainage network characteris ics. In this regard, watershed morphometric parameters are good indicators of surface runo f propensity and suscep ibility to environmental deteriora ion (Nunes et AL., 2006; SANTOS et al., 2012; FRANCO; SOUZA, 2016; ZEIGER; HUBBART, 2019). Morphometric analysis describes the relief, land form, and drainage network characteris ics of watersheds (SANTOS et al., 2012; SANGMA; GURU, 2019) through the spa ial analysis of al imetric and watercourse data, the accuracy of which depends on the source data (SAHOO; JAIN, 2018). Manual drainage network vectoriza ion is a very ime-consuming process. Hence, depending on the size of the watershed, it may not always be feasible (Costa et al., 2015). However, quality hydrological data is scarce in Brazil. For example, the data available on sites such as that of the Na ional Water Agency (ANA, acronym in Portuguese) include only a limited number of rivers due to the small scale used for mapping (OLIVEIRA, 2010).
