OS Map - Introduction

Question	Answer
Cardinal point	1 of the 4 main points of the compass - north, south, east, west
Cartographer	A person who makes maps
Concave slope	All or part of a slope that becomes progressively shallower downhill
Contour lines	A line on a map joining areas of equal height
Convex slope	All or part of a slope that becomes progressively steeper downhill
Cross-section	The shape you get when cutting a straight line through an object
Discovery Series	Type of OS map with a scale 1:50,000
Easting	Vertical line on an OS map; they increase in value as move eastwards
Grid reference	Method of indicating an exact location on an OS map
Irregular area	An area containing part of grid boxes on an OS map
Legend	Informational panel explaining what the symbols on an OS map represent; also called a key
National grid	A system of coordinates or set of squares used by the OSI and printed on OS maps
Northing	Horizontal lines on an OS map; they increase in value as move northwards
Ordinance Survey Ireland	The agency responsible for producing and publishing maps in Ireland
OSI	Ordinance Survey Ireland
Ratio	Shows the relative sizes of 2 or more values
Regular area	An area on an OS map, in the shape of a square or rectangle, containing full grid boxes
Scale	The ratio of distance on a map to the actual distance on the ground
Slope	A surface of which 1 end or side is at a higher level than another
Spot height	A number and a black dot on a map to show the height of a hill, mountain etc.
Subzone	A subdivision of a zone, a box on the national grid
Symbol	Something used to represent a real object on a map, and which is explained on the legend
Triangulation pillar	Triangles on a map indicating the top of a mountain or hill

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OS Map - Introduction

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	Created by Riona Stevenson over 6 years ago