DGPS accuracy is 1 to 3 meters, depending on the distance from a US Coast Guard coastal repeater station (<http://www.navcen.uscg.gov/>). DGPS accuracy is 1 to 3 meters, depending on the distance from a US Coast Guard coastal repeater station (<http://www.navcen.uscg.gov/>).
(Barry and others, 1975; Stockwell, 2007)
Software: Seismic Unix 4.1, ImageMagick 5.5.6
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