GIS is most helpful in EIA for:

Question

GIS is most helpful in EIA for:

1. A. Mapping project area, overlaying layers (land use, hydrology, ecology, (Correct answer)
2. B. Only printing reports
3. C. Estimating project cost
4. D. Replacing field studies

Correct Answer

Option A — Mapping project area, overlaying layers (land use, hydrology, ecology,

Detailed Solution & Explanation

The correct answer is Mapping project area, overlaying layers (land use, hydrology, settlements) for impact prediction.

Key Points

• The particular strength of a Geographic Information System is spatial overlay. Land use, drainage, forest cover, settlements, soil and infrastructure are held as separate layers and superimposed, so that the project footprint can be read against every sensitive feature at once.
• That makes GIS a tool for impact prediction and site selection — identifying which habitations fall within a buffer, which watercourses lie downstream, which forest patches would be fragmented.
• The rejected options trivialise it (printing reports), misattribute it (cost estimation), or overstate it — GIS supplements field studies, it does not replace ground truthing.

Additional Information

• Typical GIS applications in an EIA include buffer analysis around the site, overlay analysis to find conflicts, network analysis for haul routes, and terrain modelling for drainage and visual impact.
• Its analytical value rests on layers being spatially registered to a common coordinate system; badly georeferenced data produce confident-looking maps that are simply wrong.
• GIS is also what makes cumulative impact assessment tractable, since several projects in one basin or airshed can be mapped together — the gap most often criticised in project-by-project clearance.
• Field verification remains essential, because a land-use layer may be years out of date and cannot record the condition of what it shows.