Aerial flood maps of Britain are revealing more than just at-risk regions - they have also led to the discovery of several Roman roads. Amateur archaeologists have been able to use the flood-mapping technology to trace the paths of Roman roads which have remained buried under the land for some 1,600 years. The aerial flood maps were created by aircraft equipped with laser scanners which measure the distance between the aircraft and the ground. Using light detection and ranging (Lidar) technology, the Environment Agency was able to detect the areas of Britain which are most at risk of flooding. The...