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• NGS Survey Map | National Geodetic Survey

  NGS Web Map The National Geodetic Survey Map is an ArcGIS Online Web Map Application that enables users to view multiple datasets provided by the National Geodetic Survey. This Web Map Application...

• What is geodesy? | NGS Facts | NGS INFO - About Us | National Geodetic Survey

  Many organizations use geodesy to map the U.S. shoreline, determine land boundaries, and improve transportation and navigation safety. To measure points on the Earth’s surface, geodesists assign coord...

• Datums and Reference Frames | Datums | National Geodetic Survey

  Datums and Reference Frames A geodetic datum or reference frame is an abstract coordinate system with a reference surface (such as sea level) that serves to provide known locations to begin surveys ...

• What is the geoid? | NGS Facts | NGS INFO - About Us | National Geodetic Survey

  What is the geoid? The geoid is a model of global mean sea level that is used to measure precise surface elevations. A depiction of the United States geoid. Areas in yellow and orange have a slightly ...

• What is GPS? | NGS Facts | NGS INFO - About Us | National Geodetic Survey

  What is GPS? The Global Positioning System let's us know where we are (and where we are going) anywhere on Earth. The GPS Block IIR(M) Satellite shown here is one of the various generations of GPS s...

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