![]() ![]() On OS maps they are shown as thin orange or brown lines, some of which have the land height written on them. Spot heights show the height of a particular point on the map.Ĭontour lines are added to a map to show height and gradient. On a map, height is shown in metres above sea level. ![]() © Crown copyright and database rights 2015 Ordnance Survey Contours and spot heights Write the two-figure northings number, but then add a third number to show how many tenths of the way up the grid square the place or object lies.Write the two-figure eastings number, but then add a third number to show how many tenths of the way across the grid square the place or object lies.Six-figure grid references locate a place or object within a specific part of a grid square and are found as follows The number will consist of another two digits giving a total of four, hence the name four-figure grid reference. Then, write the northings number of the bottom left corner of the square (northings are found along the side of the map).First, write the eastings number of the bottom left corner of the square (eastings are found along the bottom of the map).The lines up the side of the map are called northings as they travel towards the north.įour-figure grid references locate a place or object within a grid square and are found as follows The lines across the bottom of the map are called eastings as they travel towards the east. Every OS map has a grid, which is shown using faint blue lines. Grid references accurately locate places on a map. This may be used to show larger areas or regions.Ī graphic scale is depicted using a line, with separations marked by smaller intersecting lines, similar to a ruler. This may be used for individual towns and cities. Scale is shown as a ratio, eg 1:25,000 means that 1 cm on a map represents 25,000 cm or 250 m in real life. The relationship between the features on the map to the real size on the ground is called the scale. Maps show objects as being much smaller than they are in real life. © Crown copyright and database rights Ordnance Survey 100019855 Scale and distance Each OS map has a key to show what the symbols mean. OS maps show physical and human features as symbols. How to use an OS map, using scale and grid references Using a key ![]()
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