ADS-B uses GPS signals to determine aircraft position, particularly for airport approach and departure.
ADS staff are available to consult with potential depositors by e-mail or telephone during office hours (9-5 Monday to Friday).
ADS 1. Arc Digitizing System. A simple digitizing and editing system used to add arcs and label points to a coverage.
2. A command at the Arc: prompt that starts an ADS session.
 See also: Information, GIS, Cover, Location, Core
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