Mon Dec 10 21:20:56 EST 2007
<<On Mon, 10 Dec 2007 19:22:17 -0500, "Robert F. Sutherland" <firstname.lastname@example.org> said:
> Google Earth coordinate readings generally have a small difference
> from USGS maps, longitude worse (a few seconds), maybe varible.
> I have not sufficiently correlated the difference
> to offer any ideas of prediction.
Most likely it's an issue of different geodetic datums. The FCC uses
NAD27 (the North American Datum of 1927) for broadcast licensing,
although for antenna-structure registration, WGS84 (World Geodetic
System 1984) is used -- probably Google Earth does the same. There is
a utility on the Media Bureau's Web site to convert between the two.
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