Geodesic coordinates
Howard Flack crystal at flack.chThu Aug 5 17:50:19 BST 2004
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For the ever increasing number of users of GPS systems, I suggest that something like the following should be considered for inclusion in the CIF core dictionary. _audit_author_geodesic_longitude _audit_author_geodesic_latitude _audit_contact_author_geodesic_longitude _audit_contact_author_geodesic_latitude _journal_coeditor_geodesic_longitude _journal_coeditor_geodesic_latitude _journal_techeditor_geodesic_longitude _journal_techeditor_geodesic_latitude _publ_contact_author_geodesic_longitude _publ_contact_author_geodesic_latitude _publ_contact_geodesic_longitude _publ_contact_geodesic_latitude Until the era of GPS there were very many locally based coordinate systems. Nowadays for terrestial, marine and aircraft navigation it is almost always coordinates based on the WGS84 geodesic datum with the mean position of the cross wires of the Airy telescope at Greenwich, England being taking as the prime meridean. One finds the numeric values of the above coordinates given in a variety of formats: Whole degrees with decimal fractions of a degree following the decimal point or comma Whole degrees and whole minutes with decimal fractions of a minute Whole degrees, whole minutes and whole seconds with decimal fractions of a second. The longitude is given: either as a positive number followed by N (Northern hemisphere) or S (Southern hemisphere) or a positive number (northern hemisphere) or negative number (southern hemisphere) The latitude is done likewise with E/W or positive and negative numbers. H.
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