Dataset Activity Stream OS Terrain 50 Contour Ordnance Surveys OS Terrain 50 Contour is a dataset representing the physical shape of the real world. The dataset includes contours (50metre interval), spot heights, and high and low water marks. The product is updated and maintained annually. Data and Resources Unnamed resourceHTML Unnamed resourceXML Unnamed resource Breaklines Contours Elevation Height Spot Heights Tidelines Additional Info Field Value Last Updated February 11, 2019, 16:01 (UTC) Created February 11, 2019, 16:01 (UTC)