Hydrographies MERIT-Hydro derived (90m)

Tiling system to delineate entire basins

Global basin delineation

We zoom in Terra del Fuego (Argentina) to appreciate the details of the stream network. The minimum upper stream flow accumulation area (threshold) was set to 0.05 km. This small value allows delineating very small headwater streams.

Global basins and stream network

Stream network over-imposed on OpenStreetMap

Our stream network is able to identify very small streams, that are not present in OpenStreetMap.

OpenStreetMap

Stream network over-imposed to satellite images

Over-imposing the stream network on satellite images highlight a good quality match between the valleys and derived streams.

Satellite images

Is ongoing a validation procedure with national datasets.