Generación de modelos topográficos a partir de fotogrametria digital automatizada en un río de gravas altamente dinámico

The development of topographic models is fundamental to characterize landscapes, to study the evolutions of surfaces and to support modeling. In this study we present the full design to develop topographic models in fluvial systems by means of automatic digital photogrammetry (Structure from Motion). Results indicate that (i) this methodology allows obtaining multi-scale topographic models (from particle scale to higher scales) at unprecedented spatial scales (101 km); and (ii) this approach reduces the time involved in field data acquisition but maintains acceptable post-process errors (100 cm). Data obtained in the Upper Cinca is being critically analyzed to determine the minimum number of ground control points and their spatial distribution in order to maintain the quality and density of the resulting point clouds.