![]() When the survey is done for less then 10 Kms, variation due to curvature of the earth will be insignificant and flat earth models can be used. So the Cartesian coordinate system cannot be used to represent Earth Surface as Earth has a Spherical Surface. Each reference line is called a coordinate axis or just axis of the system, and the point where they meet is its origin, usually at the ordered pair (0,0)Įarth is not a Flat Surface.
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