Mapping and Geodetic Datums

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For those of you who are creating map data and have questions about horizontal and vertical datums. Below is a link to FAQ from National Geodetic Survey (NGS).

NOAA’s National Geodetic Survey (NGS) defines and manages a national coordinate system. This network, the National Spatial Reference System (NSRS), provides the foundation for transportation and communication; mapping and charting; and a multitude of scientific and engineering applications.

http://www.ngs.noaa.gov/faq.shtml#WhatNAD

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