Coordinate System - 2D Projection

The shape of earth is mainly represented by an oblate spheroid or ellipsoid or a geoid. Imagine the earth as an orange (not a perfect shape). To project the earth on a plane and get a 2D projection of the world, the orange has to be peeled and unfolded.

crs_orange.png

 

When peeling the orange and laying the result on a table (projecting), there will be cracks and distortions. Different ways of projecting the orange will lead to different types of distortions at different places of the earth.

crs_orange_2.png

 

Choosing the coordinate system (Datum and 2D projection): 

  • The distortions are locally minimized.
  • The correct measurement unit is selected (meters, feet).
  • The results are aligned with GIS data from other sources.

crs_projection.png

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