Cylindric Projection: Mercator and Transverse Mercator Projections (Especially for GATE-Geospatial 2022)

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A map projection in which the surface features of a globe are depicted as if projected onto a cylinder, normally positioned with the globe centered horizontally inside the cylinder. Distortion of shape and scale in a cylindrical projection of the earth is minimal in equatorial regions and maximal at the poles. There are many map projections are commonly used:

1. Mercator

This Figure Shows Mercator Projection

Properties

Conformal, small shapes are well represented because this projection maintains the local angular relationships.

Increasingly distorted toward the polar regions.

Scale is true along the equator, or along the secant latitudes.

Major uses: Navigation charts; conformal world maps

2. Transverse Mercator

This Figure Shows Transverse Mercator

Properties

It is a revision to the standard Mercator projection in which the cylinder is longitudinally along a meridian instead of the equator. This Mercator projection maintains true local directions.

Major uses: Topographic mapping for areas with north-south extent; U. S. State Plan Coordinates System (SPCS) for all north-south State Plane Zones.

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