Why in News :
India’s coastline has been reassessed using high-resolution digital tools, increasing its length from 7,516 km to 11,098 km—a 48% increase.This is not due to territorial gain but because of improved geospatial mapping, including the addition of previously unrecorded offshore islands.
Key Features of the Reassessment
- New Scale Used: From 1:4,500,000 (low-resolution) to 1:250,000 (high-resolution).
- Tools Used: Modern GIS software, replacing earlier manual calculations.
- Coastline Paradox: Coastline length increases with finer resolution, due to irregularities being more accurately captured.
- Island Count Revised: Now officially 1,389 islands (1,298 offshore + 91 inshore), excluding river islands.
Implications of the Revised Coastline
Administrative
- Coastal districts may see changes in jurisdiction or CRZ zones, requiring updated policies.
- Helps in accurate delimitation and better resource allocation for coastal management.
Environmental
- Erosion patterns, disaster preparedness (e.g., tsunami, cyclone zoning), and climate vulnerability mapping become more precise.
- CRZ regulations may expand in coverage, necessitating revised land-use policies.
Strategic & Security
- Updated island mapping helps enhance maritime surveillance and defence logistics, especially in border areas like Andaman, Lakshadweep, and coastal Gujarat.
- Clearer baseline mapping aids in delimitation of maritime boundaries (UNCLOS compliance).
Developmental
- Boosts planning for coastal infrastructure, including tourism, port-led development (Sagarmala), and blue economy initiatives.
Global Comparison & Best Practices
- Many countries (e.g., UK, Japan) conduct regular coastal reassessments due to similar challenges from the coastline paradox.
- India will now recalculate its coastline every 10 years, aligning with international norms.
Coastline Paradox
- The Coastline Paradox refers to the counterintuitive concept that the length of a coastline increases as the measurement becomes more precise.
- First noted by Lewis Fry Richardson in the 1950s and mathematically explored and popularised by Benoît Mandelbrot in 1967.
- The paradox arises because coastlines are not straight lines but are highly irregular and jagged, often displaying fractal-like properties.
- Smaller units of measurement (e.g., 1 km vs 200 km) capture more inlets, estuaries, and tidal features, leading to a longer total length.
- As the scale decreases, finer geographical details are accounted for, and the measured length keeps increasing.
- Hypothetically, if measurement were done at the molecular level, the length could approach infinity.
- Hence, a coastline doesn’t have a fixed length, but rather a length that depends on the scale of measurement—this is the core of the paradox.
- It highlights a key issue in cartography and geospatial science: the inherent challenge of measuring irregular natural forms using linear metrics.
| UPSC Relevance GS1 – GeographyGeospatial mapping, Coastline Paradox, River and Coastal Landforms GS2 – GovernanceImpact on CRZ norms, coastal administration, maritime zones GS3 – Environment & Disaster ManagementClimate resilience, erosion mapping, land-use planning GS3 – Security & InfrastructureCoastal security, port development, strategic surveillance Mains Questions for Practice Q. How can geospatial advancements aid in better coastal governance and disaster management? (GS2/GS3 – 250 words) |