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WEEK 3
TOPIC: MAP DISTANCE
CONTENT:
- Measurement and Units of measurement.
- Conversion
SUB-TOPIC 1: MEASUREMENT AND UNITS OF MEASUREMENT
Measurement of Distances
There are two types of distance that can be measured on the map.
MEASUREMENT OF STRAIGHT-LINE DISTANCES
This is the measurement of distance between two places on a straight line. A straight line distance is usually referred to as “as the crow flies” i.e. on a straight route or way.
PROCEDURE
- Locate the two places or points involved in question on the map.
- Measure the distance between the two places with a ruler
- Relate the distance measured in centimeter on the map to the scale of the map.
EXAMPLE: Calculate the distance as the crow flies from point A to point B.
SOLUTION:
The distance between A and B = 7cm
The scale of map = 1:100,000 or 1cm to 1km
If 1cm to 1km,
This means that, 7cm measured on the map between A and B is 7km on actual ground.
- MEASUREMENT OF CURVE OR WINDING DISTANCE
Winding or curve distance include roads, railway, rivers etc. These are distances that are not straight.
APPROACHES OR METHODS USED
USE OF THREAD: Stretch a piece of white thread along the route or curve to be measured and carefully follow all the curves or bends. Mark the end of the distance on the thread with a pen and transfer to a ruler in order to get the actual distance on the map between the two places. Relate the distance obtained to the scale of the map extract to determine the actual distance on the ground
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