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Standard OS maps

Standard OS maps. Standard OS maps. By the end of this section, you will:. Know the features of a standard OS map. Understand how relief is shown on an OS map. Be able to use four figure and six figure grid references . Ordnance survey.

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Standard OS maps

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  1. Standard OS maps Standard OS maps By the end of this section, you will: • Know the features of a standard OS map. • Understand how relief is shown on an OS map. • Be able to use four figure and six figure grid references.

  2. Ordnance survey Ordnance Survey (OS) is Britain’s national mapping agency. They produce most of the commonly used maps and map data for the British Isles. What map features tell you what the land is like? N What map features would help you navigate? Scale 1:50 000 1km

  3. Ordnance survey OS maps contain: • symbols and place names • contour lines and spot heights • a scale • grid references and grid lines • orientation N Scale 1:50 000 1km

  4. What do OS map symbols represent?

  5. How is relief shown on a map? Relief is shown on maps in three main ways: • contour lines • spot heights 19 32 37 31 40 46 21 30 14 20 10 12 • colour shading. 10-20m 21-30m 31-40m 41-50m

  6. Contours Relief is often shown on OS maps by light brown/orange lines known as contour lines. Contours are lines that join points of equal height. Contour linesusually have a number attached to them. This number indicates the height of the land above sea-level.

  7. Labelling landscape features

  8. Grid references Areas on maps can be identified with a grid reference. For example the highlighted square has the grid reference 0231. 34 The first two digit number is the easting. This is the number at the top or bottom of a map. The second two digit number is the northing. This is the number at the side of a map. 33 32 31 30 00 01 02 03 04 A grid reference is a set of two numbers, the easting and the northing.

  9. Finding a grid reference How would you find the grid reference of square 0231? 34 • Find the easting by placing your finger on the 02 line at the bottom. • Find the northing by placing a second finger on the 31 line at the side. • Draw your fingers along the lines until they meet. 33 32 31 The square is North-east of the point where they meet. 30 00 01 02 03 04

  10. Four figure grid references

  11. Six figure grid references 34 Sometimes we need to be specific about the location of a place. 33 Six figure grid references help us be more exact. 32 31 024 315 is the six figure grid reference of the church in grid square 02 31. 30 00 01 02 03 04 What do the extra numbers mean in 024 315?

  12. Finding a six figure grid reference How would you find the grid reference 024 315? • Use the first two digits of each three digit number to find the four figure reference, 024 315. • Imagine the square, 02 31, is divided into tenths vertically and horizontally. • Use the last digit of each three digit number, 024 315 to estimate lines at 4 tenths across the square and 5 tenths up the square. • 024 315 is the point where the imaginary lines cross. 32 5 31 4 02 03

  13. Finding six figure grid references

  14. Features of an OS map

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