Summary
Short summary - Mapwork
- Institution
- 12th Grade
Very short and brief summary to remember some helpful map work calculations
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Mapwork:Distance:
Map distance × Scale ( 10 000∨50 000 )
100 000(km)∨1000( m)
Area:
L×B
(answer in the distance of the measured for l and b )
Gradient:
Vertical Interval
Horizontal equivalent
(No units, use in ratio 1:23)
True bearing:
Draw line of north
Measure
Magnetic Declination:
2023-year on map
Answer x mean annual change
Add the degree to minutes to the answer from above
2011-2002= 9years
9 years x 6’ W = 54’ West
23° 33’ + 54’ = 23° 87’ W
= 24° 27’ West of true north
Magnetic Bearing
Magnetic declination + true bearing
Vertical exaggeration:
( 5000
Vertical scale
1
∨
2000 )
1
Horizontal scale (
50000 ) ¿
1
¿
(answer = x times)
10 times or 25 times)
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