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The NENA 3D GIS working group will produce a document that will define requirements and guidelines for handling of expression of caller location in three dimensions (X/Y/Z coordinates), including confidence and uncertainty. These guidelines will include methods to convert a height above ellipsoid (HAE) value to height about ground level (AGL) or floor level, so that the information is more meaningful in the field, as well as guidelines to construct GIS datasets that can handle three dimensional location data, such as road or building geometry…
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