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7 Terms
1
Datum
a tool used to define the shape and size of the earth, as well as the reference point for the various coordinate systems.
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2
Geoid
The most accurate representative shape of the earth, defined as the shape that the surface of the oceans would take under the influence of Earth's gravitation and rotation alone.
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3
Ellipsoid
A model of the earth's shape, more accurate than a sphere, which is flattened due to centrifugal force of the earth's rotation.
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4
WGS84
A specific geodetic datum commonly used in Google Earth and GPS systems, representing the current standard for spatial data worldwide.
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5
NAD
A commonly used geodetic datum in North America applying a specific spheroid for accurate mapping.
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6
Major Axis & Minor Axis
The two axes defining an ellipsoid; the major axis is longer, while the minor axis is shorter.
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7
Geographic Coordinate System
A system that uses latitude and longitude to define locations on the earth's surface.
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