Geography Reference
In-Depth Information
Example of a location in the USNG coordinate system.
bases it on 3
-wide stripes at the 6, 9, 12, and 15 meridians. The zones are
numbered two through five, or the meridian longitude divided by three. A
false easting of 500,000 meters is calculated for east-west coordinates in
each stripe, and north-south coordinates are the distance to the equator.
North-south coordinate values have seven digits and east-west coordinate
values have six digits, precluding switching the coordinates. Australia has
developed new national grids directly as coordinate systems at frequent
intervals, ref lecting both frequent tectonic movement (up to 7 cm/year) and
improvements in geoid measurements. The Geocentric Datum of Australia
coordinate system is the most recent and is based on the ellipsoid measure-
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