Fieldwork and/or laboratory work, Various educational resources. Coastal dynamics can be analyzed by multitemporal comparison of Digital Elevation Models (DME) generated by geodesic method based on GNSS positioning and altimetry in relation to the Brazilian Geodesic System (SGB), providing measurement of morphological changes of short duration (intranual) on a regional scale. The methodology consists in comparing Coastal Lines (LC) and Digital Elevation Models (MDE) of Ponta Dareia beach, located in Maranhão island, on a biannual scale, to obtain areas and volumes of erosion/acretion and the sediment balance flow diagram. The analysis of the generated maps also allows the identification of the orientation of sediment transport in the LC, the implications on the sediment balance and its correlation with meteoceanographic agents (winds and waves). The results may reveal morphological features typical of beach areas with the benefits of high GNSS productivity in relation to conventional topography, which will subsidize studies of sea level rise, generation of a geo-environmental database and future computational simulation in Virtual Geographic Environment (VGE).
