Question
Download Solution PDFWhat projection is used in the Survey Of India (SOI) Topographical maps?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFAns: (C) Polyconic
Key Points
- Polyconic Projection is used in Survey of India (SOI) topographical maps due to its suitability for small-scale mapping.
- This projection provides accurate representation over smaller areas with minimal distortion.
- True scale is maintained along the central meridian, making it reliable for topographic surveys.
- The Everest 1830 Datum was traditionally used for SOI maps, while modern mapping uses WGS-84 datum.
Important Points Why not other projections?
- Mercator Projection is mainly used for navigation but causes distortion in area and shape.
- Lambert Conformal Conic Projection is used for aeronautical and regional maps.
- Azimuthal Equidistant Projection is used for polar and radio wave propagation mapping.
Additional Information
- The 1:50,000 and 1:25,000 scale maps by SOI use the Polyconic Projection for precise geographical representation.
- Newer digital maps integrate UTM (Universal Transverse Mercator) and WGS-84 for global standardization.
Last updated on Feb 11, 2025
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