IE GSI EPA Hydrological DTM 20m Contours 10m interval Ireland (ROI) ITM

The hydrologically-corrected DTM (hDTM) is a raster map of landscape drainage-paths created for the Environmental Protection Agency (EPA) by Compass Informatics in 2002. The hDTM flow-paths represent a simulated (as opposed to real) drainage network. However, they have the important advantage that their drainage areas are known. The hDTM is useful for environmental research and modelling. Contours at 10m intervals were generated from the hDTM.