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Question

Difficulty: MediumGIS and Remote Sensing Fundamentals

In a Geographic Information System (GIS) project aimed at protecting riverbanks from agricultural runoff in the Ogun River basin, environmental planners need to generate a continuous 100-metre protective zone surrounding all stream vectors. Which spatial analysis operation is most appropriate for creating this distance-based boundary zone?

  1. BufferingAnswer
  2. B
    Overlay analysis
  3. C
    Spatial interpolation
  4. D
    Network analysis

Answer

Buffering is the spatial analysis operation designed to generate a polygon zone at a specified distance around geographic features.
Buffering is a core GIS spatial analysis tool used to perform proximity calculations. It generates a polygon zone at a predetermined distance around point, line, or polygon vector features, making it the correct method for creating a 100-metre riparian protection corridor along stream networks.

Step-by-Step Solution

1
Identify the geographical requirement stated in the problem.
The requirement is to create a uniform 100-metre protective corridor surrounding stream vectors.
Establishing a distance-based boundary around spatial features requires a proximity analysis tool.
2
Evaluate GIS spatial operations against distance corridor generation.
Buffering constructs new polygon features at a specified radius or offset distance surrounding target vector geometries.
Buffering is the standard GIS operation used for setback zones, noise boundaries, and riparian conservation corridors.

Key Concept

GIS Proximity Analysis and Buffering
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Topics

GIS and Remote Sensing Fundamentals

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