Sec 2 Geography Topographical Skills
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Transcript of Sec 2 Geography Topographical Skills
State the compass direction between two different points
Measure the compass bearing between two points.
Lesson Objective
Four-figure grid references
1. Locate the grid square
2. Mark a X at the bottom left hand corner of that grid square (grid reference/ intersection point).
3. Read the Easting
4. Read the Northing
Recap
Six-figure grid references
1. Locate the grid square
2. Mark a X at the bottom left hand corner of that grid square (grid reference/ intersection point).
3. Divide into ten equal parts.
4. Read the Easting
5. Read the Northing
Recap
A compass has four basic points: North (N), South (S), East (E) and West (W)
The points can be further divided into eight compass points
Compass Direction
Keyword: ‘from’
When identifying direction, take note of the word ‘from’, which stands for the point you are taking direction from/start point.
Identifying Compass Direction
Q1: Find the compass direction of the clinic from the market.
Steps to identify compass direction (p.44)
Steps
1. Draw right-angled cross on the location/ start point.
2. Indicate cardinal points on the cross (NESW).
3. Draw a straight line to join the two points (e.g. market and clinic)
4. State the compass direction.
Steps to identify compass direction (p.44)
The direction of the clinic from the market is northeast.
Q1: Find the compass direction of the clinic from the market.
Compass Bearing
Compass bearings are compass directions between two points measured in degrees
More precise than compass directions
Measured at an angle clockwise from the north
Geographical Investigations and Skills16
Q5. Find the compass bearing of location B from A. (compass bearing less than 180°)
Steps:
1. Place a right-angled cross on Location A
2. Indicate the cardinal points on the cross (N)
3. Draw a straight line between the Locations A and B
Geographical Investigations and Skills17
A
B
N
Q5. Find the compass bearing of location B from A. (compass bearing less than 180°)
Steps:
4. Place a protractor on the paper such that the centre of the protractor is on Location A
5. Read clockwise from 0° to get the compass bearing
Geographical Investigations and Skills18
A
B
N
Q6.Finding compass bearing of location B from locations A. (Compass bearing more than 180°
Steps:
Repeat step 1 – 3 –
4. Turn the protractor around and measure the angle.
5. Add 180° to the bearing measured by the protractor in a clockwise direction
Geographical Investigations and Skills19
B
A
N
Steps
1. Place a right-angled cross on Location A
2. Indicate the cardinal points on the cross (N)
3. Draw a straight line between the Locations A and B
4. Place a protractor on the paper such that the centre of the protractor is on Location A
5. Read clockwise from 0° to get the compass bearing
Steps to identify compass bearing (p.45)
Steps
Compass bearing more than 180°
Repeat step 1 – 3
4. Turn the protractor around and measure the angle.
5. Add 180° to the bearing measured by the protractor in a clockwise direction
Steps to identify compass bearing (p.45)