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Area and Grid References
This document discusses how to locate features on topographic maps using grid references and area references. It explains that topographic maps use a grid system of eastings and northings to precisely locate points, while area references specify the grid square that a feature falls within using the coordinates of the bottom left corner. Examples are provided to demonstrate how to determine both 6-figure grid references and 4-figure area references. Interactive exercises are also included to allow practice of these skills.
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Area and Grid References
- 1. 1Geography Skills andTools Area and Grid Reference Mr Shipp
- 2. Grid & AreaReferences • It can be difficult to find places or features easily on a map. • So far we have learnt that to find places on a street directory we use an alpha-numeric grid (e.g. B7) • We also know that to find places on a larger scale, such as a world map we use Latitude & Longitude coordinates to help us find what we are looking for.
- 3. Topographic maps arelarge scale and we use these for Area and Grid references
- 4. So how dowe locate features on a Topographic map? • http://news.bbc.co.uk/2/hi/uk_news/wales/north_west/7824895.stm • This BBC link details the importance of Grid References for emergency services to reach rural areas. • We can locate places easily on a topographic map by using the maps gridlines. • On a topographic map the vertical ( )lines are called eastings because they increase in value as we move eastward. • The horizontal ( ) lines are called northings because they increase in value as we move northwards.
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- 6. Area Reference • Featuressuch as a small lake, quarry or village are usually located by means of an Area Reference (AR) • To find the (AR) of a feature we use the coordinate in the lower left-hand corner of the grid square in which the feature is located. • You always read the easting first then the northing. (hint to remember E comes before N in the alphabet) • An area reference always has 4 figures • Into the house and up the stairs” may help you remember!! EXAMPLE: AR3363 easting northing
- 7. Eastings Northings N 18 17 16 15 22 23 2425 26 27 The Area Reference of the house is: AR2317 Remember with (AR) you use the bottom left hand corner What is the (AR) for: The plane: AR2215 The boy: AR2316
- 8. Area references 21 2223 24 25 26 39 38 35 36 37 A Time now for a little test. FOUR squares are going to be highlighted and you have TEN seconds to write down the area reference for each square. 10 9 8 7 6 5 4 3 2 1 ACLICK to start..... CLICK for the next square
- 9. Area references 21 2223 24 25 26 39 38 35 36 37 A 10 9 8 7 6 5 4 3 2 1 BCLICK for the next square B
- 10. Area references 21 2223 24 25 26 39 38 35 36 37 A 10 9 8 7 6 5 4 3 2 1 CCLICK for the next square C B
- 11. Area references 21 2223 24 25 26 39 38 35 36 37 A 10 9 8 7 6 5 4 3 2 1 DCLICK for the next square C B D
- 12. Area references 21 2223 24 25 26 39 38 35 36 37 A CLICK TO CHECK EACH ANSWER C B D A = 2238 B = 2536 C = 2235 D = 2337 How did you get on?
- 13. Grid References • Wecan locate relatively small and more specific features on map by using Grid Reference (GR). • (GR) locates the exact point on the grid. • Unlike (AR), Grid Reference uses 6 figures. -The first two numbers of each coordinate refers to the eastings and northings that surround the map. - The third number needed to complete each coordinate is obtained by dividing each easting and northing into tenths. Example: GR335638 easting northing Dividing the easting and northing into tenths
- 15. Eastings Northing N 18 17 16 15 22 23 2425 26 27 What is the grid reference (GR) for the ball in which the boy is about to catch? Answer: GR238169
- 16. 6-figure grid references Comeup to the Interactive White Board
- 17. Compass Directions 21 2223 24 66 67 68 F A B GC H E I D J N E S W NW NE SE SW What direction are you walking ? D F H I JGA C EB A
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- 19. CLASS EXERCISE Give the(AR) for the following features: 1. Church; 2. Village Hall; 3. Grove farm; 4. The dairy farm; 5. The town of Little Plumpton; 6. The entire (AR)’s for Gibbet Wood; 7. The (AR)’s that Dale Road passes through; 8. The approximate (GR) of Grove farm.
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