Step 2 in Map Projection: Aspect of Projection (Especially for GATE-Geospatial 2022)

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Once a choice is made between projecting onto a cylinder, cone, or plane, the aspect of the shape must be specified. The aspect describes how the developable surface is placed relative to the globe. It may be normal, transverse, or oblique.

This Image Shows Three Developable Surfaces

In figure, central meridian selected by mapmaker touches cylinder if the cylinder is tangent

Can show whole Earth, but the directions, distances and area are reasonably accurate only within 15 degrees of the central meridian.

The aspect of the projection surface can be:

  • Normal (In line with the earth՚s axis)
  • Transverse (at right angles to the earth՚s axis)
  • Oblique (any angle in between)

These surfaces may also be either tangent or secant to the sphere or ellipsoid.

Developed by: