Which human-made feature is found at grid reference 31°49'41"S; 26°45'35"E on the topographical map?
A - NSC Geography - Question 3 - 2023 - Paper 1
Question 3
Which human-made feature is found at grid reference 31°49'41"S; 26°45'35"E on the topographical map?
A. Trees
B. Spot height
C. Ruin
D. Building
The contour interva... show full transcript
Worked Solution & Example Answer:Which human-made feature is found at grid reference 31°49'41"S; 26°45'35"E on the topographical map?
A - NSC Geography - Question 3 - 2023 - Paper 1
Step 1
Which human-made feature is found at grid reference 31°49'41"S; 26°45'35"E on the topographical map?
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Answer
At the given coordinates, the human-made feature found is likely to be a ruin (option C). This can be inferred from the geology and land use in the area.
Step 2
The contour interval on the orthophoto map is ... metres.
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Answer
The contour interval on the orthophoto map is 10 metres (option B). This can be identified by examining the contour lines indicated on the map.
Step 3
The photo number for the orthophoto map of NOOITGEDACHT is ...
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Answer
The photo number for the orthophoto map of NOOITGEDACHT is 31 (option A). This detail is usually found in the map legend or related documentation.
Step 4
Calculate the area in m² of the frame labelled F in block E3 on the topographical map.
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Answer
The area of the frame can be calculated using the formula:
Calculate the average gradient from 6 in block D4 to 7 in spot height 1567.
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Answer
Using the formula for average gradient:
Average Gradient = rac{ ext{Vertical Interval (VI)}}{ ext{Horizontal Equivalent (HE)}}
Vertical Interval = 1567 - 950 = 617 ext{ m}
Average Gradient = rac{617}{950} ext{ (unitless)}.
Step 6
There is no intervisibility between 8 in block D4 and 9 in block D2 on the orthophoto map.
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Answer
The type of slope responsible for the lack of intervisibility is a valley or a dip in the terrain which obstructs the line of sight between these two points.
