GLONASSARY

NAD83 (North American Datum 1983) – This is one of many different mathematical projection models upon which satellite-derived positions can be translated into a coordinate system that corresponds to positions derived through standard maps. For the sake of simplicity, each datum has mathematical parameters that define it, including the predicted center of the Earth and the mathematical shape of the Earth. Because the Earth is not perfectly spherical or ellipsoidal, the mathematical parameters may provide a model that is accurate on one portion of the planet, while being horribly inaccurate on another. NAD83 is a best-fit model for North America, Canada, Mexico, and Central America, while the previous model (NAD27) was designed for a central portion of North America only. Neither datum is wrong; however, errors may be introduced into positioning if one operates outside of the datum’s range or if coordinates from one datum are compared to coordinates from another datum.

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