Altnaharra, Roy Military Survey of Scotland, 1747-55 (litho)

The Roy Military Survey of Scotland, known to its contemporaries as the 'Great Map', is a uniquely important historical cartographic document. It provides a uniform graphic snapshot of the entire Scottish mainland at a time when the landscape was beginning an era of rapid change. For many Highland areas, it is the most detailed and informative map that survives for the entire 18th century, and for all areas, the only standard topographic map prior to the Ordnance Survey mapping in the 19th century. It had a crucial influence on the early work of the Ordnance Survey itself.