Use precise geolocation data and actively scan device characteristics for identification. This is done to store and access information on a device and to provide personalised ads and content, ad and ...

The number is the height above sea level in metres. The blue triangle represents a triangulation pillar; the networks of concrete pillars found in the UK that were used to make maps. These are ...

Spot heights show the height of a particular point on the map. Contour lines that are close together show land that increases or decreases in height quickly. This is steep land. Contour lines that ...