Global hydro-environmental sub-basin and river reach characteristics at high spatial resolution

The HydroAT LAS database provides a standardized compendium of descriptive hydro-environmental information for all watersheds and rivers of the world at high spatial resolution. Version 1.0 of HydroATLAS offers data for 56 variables, partitioned into 281 individual attributes and organized in six categories: hydrology; physiography; climate; land cover & use; soils & geology; and anthropogenic influences. HydroATLAS derives the hydro-environmental characteristics by aggregating and reformatting original data from well-established global digital maps, and by accumulating them along the drainage network from headwaters to ocean outlets. The attributes are linked to hierarchically nested sub-basins at multiple scales, as well as to individual river reaches, both extracted from the global HydroSHEDS database at 15 arc-second (similar to 500 m) resolution. The sub-basin and river reach information is offered in two companion datasets: BasinATLAS and RiverATLAS. The standardized format of HydroAT LAS ensures easy applicability while the inherent topological information supports basic network functionality such as identifying up- and downstream connections. HydroAT LAS is fully compatible with other products of the overarching HydroSHEDS project enabling versatile hydroecological assessments for a broad user community.