GLONASSARY

UTM (Universal Transverse Mercator) – 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, the mathematical parameters may provide a model that is accurate on one portion of the planet, while being horribly inaccurate on another. UTM, is a world standard for topographic mapping and digital exchange. Therefore, it is a global model that has been divided into numerous zones (60 total zones, 6° each) that represent certain sections of the globe. Coordinates collected using UTM map projection are identified as Easting (x) and Northing (y) with units measured and reported in meters, unlike NAD-83 coordinates (conventionally presented in survey feet).

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