© Crown copyright and database rights 2024 Ordnance Survey 0100031673

OS Terrain® 5 is a digital terrain model (DTM) which represents the bare surface of the ground. The data is maintained as part of the same revision process as the Ordnance Survey's large scale data to ensure consistency. With detailed modelling of significant features such as road, rail, quarries and lakes, OS Terrain 5 provides a valuable third dimension to analytical applications.

OS Terrain 5 has been measured against with GPS points in a range of sample areas to provide a root mean square error (RMSE) value of 1.5 metres in Urban areas and major communication routes.