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# Coordinate Systems

- a local projection from sphere to cylinder (base point is not fixed)
- z axis is always the opposite direction of gravity (z can represent altitude)
- the far from base point, the greater distortion of the space

- a global projection from sphere to cylinder (base point is fixed)
- the far from base point, the greater difference between z axis and gravity (z cannot represent altitude anymore)
- no distortion of the space, no matter how far from the base point

- the earth-centered coordinate system
- no distortion, but not intuitive for objects moving on earth surface

Last modified 1yr ago