OS Terrain is the name given to Ordnance Survey’s range of height products. These are three-dimensional models of the bare earth surface known as digital terrain models (DTMs).
User guide (PDF)
OS Terrain 5 is published as both grid and contours, each in a variety of formats. Both data types are created from the same source data and are supplied as 5 km by 5 km tiles.
|Key Features||What this product offers|
|Format||GML 3.2 and ASCII grid for DTM, GML 3.2 and Esri shapefile for contours.|
|Resolution||Grid: 5m post spacing. Contours: vertical interval of 5m.|
|Tile size||5km x 5km|
|Supply||Download (annual contract)|
|Update frequency||Quarterly (January, April, July and October)|