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The Universal Transverse Mercator system divides the world into zones of

  • A.6 degrees of longitude
  • B.10 degrees of longitude
  • C.3 degrees of longitude
  • D.15 degrees of longitude

Answer: A

Correct answer: 6 degrees of longitude

UTM divides the world into 60 zones of 6 degrees each, numbered eastwards from the antimeridian, with each zone given its own transverse Mercator projection about its central meridian. Keeping the zone narrow is what holds the scale error small, and the scale factor of 0.9996 on the central meridian spreads that error across the zone rather than letting it all fall at the edges.

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