Field	Description	
ID_F-LAN	Unique ID for each light	
JOIN_ID_1863_1929	Spatial Joint ID to join 1863 and 1929 lighthouses	
LATITUDE	Latitude for the location of the lighthouse	
LONGITUDE	Longitude for the location of the lighthouse	
NAME	Name of each lighthouse as reported in 1863	
VISIBILITY_MA_KM	Night-time visibility range of lights for the medieval period in kilometres.	
VISIBILITY_MA_50PC_M	Night-time visibility range of lights for the medieval period in metres, with light visible 50 per cent of the time.	
VISIBILITY_MA_90PC_M	Night-time visibility range of lights for the medieval period in metres, with light visible 90 per cent of the time.	
VISIBILITY_1775_KM	Night-time visibility range of lights for 1775 in kilometres.	
VISIBILITY_1775_50PC_M	Night-time visibility range of lights for 1775 in metres, with light visible 50 per cent of the time.	
VISIBILITY_1775_90PC_M	Night-time visibility range of lights for 1775 in metres, with light visible 90 per cent of the time.	
VISIBILITY_1800_KM	Night-time visibility range of lights for 1800 in kilometres.	
VISIBILITY_1800_50PC_M	Night-time visibility range of lights for 1800 in metres, with light visible 50 per cent of the time.	
VISIBILITY_1800_90PC_M	Night-time visibility range of lights for 1800 in metres, with light visible 90 per cent of the time.	
VISIBILITY_1825_KM	Night-time visibility range of lights for 1825 in kilometres.	
VISIBILITY_1825_50PC_M	Night-time visibility range of lights for 1825 in metres, with light visible 50 per cent of the time.	
VISIBILITY_1825_90PC_M	Night-time visibility range of lights for 1825 in metres, with light visible 90 per cent of the time.	
VISIBILITY_1837_KM	Night-time visibility range of lights for 1837 in kilometres.	
VISIBILITY_1837_50PC_M	Night-time visibility range of lights for 1837 in metres, with light visible 50 per cent of the time.	
VISIBILITY_1837_90PC_M	Night-time visibility range of lights for 1837 in metres, with light visible 90 per cent of the time.	
VISIBILITY_1846_KM	Night-time visibility range of lights for 1846 in kilometres.	
VISIBILITY_1846_50PC_M	Night-time visibility range of lights for 1846 in metres, with light visible 50 per cent of the time.	
VISIBILITY_1846_90PC_M	Night-time visibility range of lights for 1846 in metres, with light visible 90 per cent of the time.	
VISIBILITY_1863_KM	Night-time visibility range of lights for 1863 in kilometres.	
VISIBILITY_1863_50PC_M	Night-time visibility range of lights for 1863 in metres, with light visible 50 per cent of the time.	
VISIBILITY_1863_90PC_M	Night-time visibility range of lights for 1863 in metres, with light visible 90 per cent of the time.	
VISIBILITY_1872_KM	Night-time visibility range of lights for 1872 in kilometres.	
VISIBILITY_1872_50PC_M	Night-time visibility range of lights for 1872 in metres, with light visible 50 per cent of the time.	
VISIBILITY_1872_90PC_M	Night-time visibility range of lights for 1872 in metres, with light visible 90 per cent of the time.	
VISIBILITY_1929_50PC_M	Night-time visibility range of lights for 1929 in metres, with light visible 50 per cent of the time.	
VISIBILITY_1929_90PC_M	Night-time visibility range of lights for 1929 in metres, with light visible 90 per cent of the time.	
TYPE_1775	Optics used (Reflective, Lenticular, None) in 1775	
TYPE_1800	Optics used (Reflective, Lenticular, None) in 1800	
TYPE_1825	Optics used (Reflective, Lenticular, None) in 1825	
TYPE_1837	Optics used (Reflective, Lenticular, None) in 1837	
TYPE_1846	Optics used (Reflective, Lenticular, None) in 1846	
TYPE_1863	Optics used (Reflective, Lenticular, None) in 1863	
TYPE_1872	Optics used (Reflective, Lenticular, None) in 1872	
TYPE_1929	Optics used (Reflective, Lenticular, None) in 1929	
FUEL_1775	Fuel used in 1775	
FUEL_1800	Fuel used in 1800	
FUEL_1825	Fuel used in 1825	
FUEL_1846	Fuel used in 1846	
FUEL_1863	Fuel used in 1863	
FUEL_1872	Fuel used in 1872	
FUEL_1929	Fuel used in 1929	
HEIGHT_FROM_HIGH_SEA_LEVEL_M_1837	Height of lighthouse lantern above sea level (in metres) in 1837	
HEIGHT_FROM_HIGH_SEA_LEVEL_M_1846	Height of lighthouse lantern above sea level (in metres) in 1846	
HEIGHT_FROM_HIGH_SEA_LEVEL_M_1863	Height of lighthouse lantern above sea level (in metres) in 1863	
HEIGHT_FROM_HIGH_SEA_LEVEL_M_1872	Height of lighthouse lantern above sea level (in metres) in 1872	
HEIGHT_FROM_HIGH_SEA_LEVEL_M_1929	Height of lighthouse lantern above sea level (in metres) in 1929