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Map Reading and Interpretation

Map Reading and Interpretation. Direction and Bearing. Each map conveys a message. In map reading, it is necessary to understand the devices used to convey this message. Devices : Locational grid - latitude and longitude Scale – measure distance

neville-morton
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Map Reading and Interpretation

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  1. Map Reading and Interpretation Direction and Bearing

  2. Each map conveys a message. In map reading, it is necessary to understand the devices used to convey this message. • Devices: • Locational grid - latitude and longitude • Scale – measure distance • Symbols – identify natural and constructed features

  3. Identifying Location • How could you describe the location of a place a friend needs to get to? • Location can be described / identified using: • Direction • Bearings

  4. Direction • Direction on maps may be indicated using: • Compass Rose • Shows the points of a compass as shown on a map • Includes cardinal and intercardinal directions The Cardinal Directions The Intercardinal Directions A Compass Rose

  5. Compass Rose

  6. Did your map have compass directions? Compass rose or a variation If your map does not have a compass rose or any other direction indicator then it is assumed to have standard orientation. • Standard orientation • means that north is at the top of the map page. • Terminology: Do not use the term “up” to refer to the north. North is not higher than south. Do you think rivers flow north into the Arctic Ocean

  7. Direction: Describing / Words • Cardinal direction • Uses north, south, east, west • Intercardinal direction • Uses northwest, northeast, southwest, southeast • Properly naming directions between cardinal and intercardinal points always uses the cardinal direction first: • Point between south and southeast • South-southeast

  8. Bearing Bearings: • Used when greater precision is required • Substitute the degrees of a circle for the named directions • Clockwise angle between a reference direction (magnetic North normally) and direction of object Bearings

  9. Think Direction/ Think Bearing

  10. Describe the location of Point B from Point C: • Using the crosshair, the location is NNW. • A closer look – is it really NNW? Determine the direction more accurately. • Use bearings. • This takes you to a ballpark • For accuracy, use a protractor. • Place the base of the protractor on the north-south line • The center line is lined up with the east-west line • 337o

  11. What is the direction of B from A? Generally ESE • What is the bearing of A from B? 275o Actual Measure: _273_ • What is the direction of A from C? Generally WNW • What is the bearing from C to A? 290oActual Measure: 294o

  12. Activity: Direction and Bearing • Using the map provided to practice determining direction and bearing.

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