Everything about Decimal Degrees totally explained
(dd) are often used in
Geographic Information Systems (GIS), web-mapping applications such as
Google Maps, and
GPS devices to express
latitude and
longitude coordinates, rather than expressing
geographic coordinates with degrees, minutes, and seconds (dms).
Accuracy
A value in decimal degrees to an accuracy of 4 decimal places is accurate to 10
meters at the
equator. A value in decimal degrees to 5 decimal places is accurate to 1meter at the equator. Because the
earth is a
sphere and not flat, the accuracy of the longitude part of the coordinates increases the further from the equator you get. The accuracy of the latitude part doesn't increase.
Example
With DMS, the geographic coordinates of the
United States Capitol are "38° 53' 23" N, 77° 00' 32" W". In decimal degrees, West and South are considered to be negative numbers and the DMS is converted to degrees using the formula (D + M/60 + S/3600). Thus the decimal degree representation of the U.S. capitol is "38.8898341, -77.0088651".
Further Information
Get more info on 'Decimal Degrees'.
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