3.1.1 The index contour line in block A1 on the orthophoto map is … meters - NSC Geography - Question 3 - 2024 - Paper 1
Question 3
3.1.1 The index contour line in block A1 on the orthophoto map is … meters.
A
1822
B
1835
C
1840
D
1842
3.1.2 The grid references for spot height 1872 in block B1 o... show full transcript
Worked Solution & Example Answer:3.1.1 The index contour line in block A1 on the orthophoto map is … meters - NSC Geography - Question 3 - 2024 - Paper 1
Step 1
3.1.1 The index contour line in block A1 on the orthophoto map is … meters.
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Answer
The index contour line in block A1 on the orthophoto map is 1840 meters.
Step 2
3.1.2 The grid references for spot height 1872 in block B1 on the topographical map is …
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Answer
The grid reference for spot height 1872 in block B1 is B, which is 28°30’25”; 28°31’15”E.
Step 3
3.1.3 (a) Determine the vertical interval (VI) of the illustrated gradient.
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The vertical interval (VI) for the illustrated gradient is 40 meters, calculated as the difference between the maximum and minimum heights observed.
Step 4
3.1.3 (b) Is the illustrated average gradient between 6 and 7 on the orthophoto map gentle or steep?
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The illustrated average gradient is gentle because the difference in height over the distance is small.
Step 5
3.1.3 (c) State how the illustrated average gradient influenced the human activities between 6 and 7 on the orthophoto map.
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The gentle gradient likely facilitates agricultural activities as it allows for easier water drainage and accessibility for farming.
Step 6
3.1.4 (a) Determine the true bearing (TB) from spot height 1802 to the trigonometric station 1820.
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Answer
The true bearing from spot height 1802 to the trigonometric station 1820 is 220°.
Step 7
3.1.4 (b) Calculate the magnetic declination (MD) for 2024 if the 2020 value is 4° westwards.
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Answer
If the magnetic declination for 2020 is 4° westwards, it is expected to remain similar in the following years, hence MD for 2024 is also 4° west.
Step 8
3.1.4 (c) Determine the bearing (MB) from spot height 1802 to trigonometric station 1820.
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The bearing (MB) from spot height 1802 to trigonometric station 1820 is calculated as MB = TB + MD = 220° + 4° = 224°.
