Mapwork Calculations

Question 1

Bearing

Answer 1

North at 0 measure clockwise

Question 2

Back Bearing

Answer 2

If b>180, substract 180 if b<180, add 180

Question 3

Direction and flow of rivers

Answer 3

Rivers flow from a high point to a low
point. Some things to look out for:

Height changes

Direction of the Dam wall.

Where the sea is (it is the lowest point so
water will always flow into it)

Question 4

Slope Types

Answer 4

Gradual - contour lines far apart. Steep - contour lines close

Question 5

Concave vs convex?

Answer 5

Concave steeper near top. Contour lines start far apart and get closer. Convex is steeper near bottom. Like a ‘V’ convex starts with contour lines close together and they get further apart.

Question 6

Settlement types

Answer 6

Isolated, dispersed refers to a settlement that is not clustered together but is scattered around the countryside. Nucleated aka clustered, densely packed.

Question 7

Settlement shapes

Answer 7

Linear(along road) Cross roads, T junction, Stellar

Question 8

Gradient

Answer 8

Rise over run(Vd/Hd) GET EVERYTHING IN METRES leave answer as ratio of 1:gradient(m)

Question 9

Vertical Exaggeration

Answer 9

VE = Vertical Scale / Horizontal scale. Leave as answer as times so if 2500 is the answer you say 2500x

Question 10

Magnetic Declination

Answer 10

Current Year – Year map was made

Multiply by the annual change. (Write the
direction)

Make sure the given Mag decli given is in Deg,
Min and Sec and not Dec. degrees i.e Dec Deg:
32, 8° = Deg/min/sec: 32° 48’ (Ignore the
number left of the comma, multiply the 0.8 by
60’. Number left of the comma is your minutes,
Repeat the process for minutes)

Add or subtract it to the mean mag. Decli. On
map. (if east then subtract; If west then add.)

Question 11

Magnetic Bearing:

Answer 11

Magnetic Bearing: Add the Magnetic declination
to the Map Bearing

Question 12

Orthophoto

Answer 12

1:10000

Question 13

Map colours

Answer 13

Blue – Water features (Rivers, dams, furrows
ect)

Red – National Roads

Black/grey – Man-made/built up areas (Roads,
houses, industry, towns ect.)

Green – Cultivated land (Farm land,
Orchards, trees ect.)

Brown – Earth features ( Mountains, sand,
ditches, contours ect.)