During the 2008 floods, accessibility to the Oliphant’s River Valley was limited to determine the extent of the damage - NSC Geography - Question 4 - 2017 - Paper 2
Question 4
During the 2008 floods, accessibility to the Oliphant’s River Valley was limited to determine the extent of the damage. A GIS specialist used remote sensing to acces... show full transcript
Worked Solution & Example Answer:During the 2008 floods, accessibility to the Oliphant’s River Valley was limited to determine the extent of the damage - NSC Geography - Question 4 - 2017 - Paper 2
Step 1
Define the term remote sensing.
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Answer
Remote sensing refers to the observation of the earth from a distance using satellites to gather information without direct contact with an area.
Step 2
State TWO reasons as to why the GIS specialist chose remote sensing.
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Answer
Data can be collected from inaccessible areas, which is crucial during emergencies like floods.
It can be used to track changes and development in an area over time.
Step 3
Evaluate how this would prevent the mismanagement of the river.
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Buffering around the Oliphant’s River can help to limit pollution from pesticides and waste deposited by farms. Additionally, it plays a key role in reducing riverbank erosion and controlling nutrient runoff, which can negatively affect aquatic life.
Step 4
Define the term spatial data.
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Spatial data refers to the location and shape of geographical features, representing the physical characteristics of the earth.
Step 5
Classify each of the following spatial objects in block E5, as a point, line or polygon (area).
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(a) Non-perennial river / hiking trail: line
(b) Spot height 1328: point
(c) Dam / cultivated lands: polygon
Step 6
Define the term data integration.
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Data integration involves combining different types of data for decision-making and linking information from a variety of sources.
Step 7
Mention ONE problem that was experienced with data integration as shown in the diagram / figure, prior to the introduction of GIS.
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Maps have different scales; for instance, one map may be 1: 30 000 and another 1: 60 000, leading to complications in comparing and interpreting data.
Step 8
State TWO ways in which data integration could have assisted the farmer in making his farm at Kleinplaas, block E8, economically viable.
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Availability of water resources to support agricultural activities.
Fertility of soil to ensure successful crop yields.
