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WEEK 3
TOPIC: MAP DISTANCE
CONTENT:
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
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.
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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