3/17/2023 0 Comments Standard datum planeOthers used are mean low water, mean lower low water, mean high water, mean higher high water. Position of the adjusted datum, above or below the initial datum, is governed by the degree to which reduction is made in the inherent differences between distances measured on the ground, and distances computed using plane coordinates of points and features delineated on maps compiled, or survey distances computed and/or measured on the adjusted datum.ĭatum, elevation-Usually mean sea level as determined by hourly readings over an 18.6- or 19-year average. The adjusted datum is always parallel to the initial datum. For statistical references, the plural form is “data,” e.g., “geographic data for a list of latitudes and longitudes.” For particular geometrical concepts, such as “several geodetic datums have been used in the United States,” the correct plural form is “datums.” 2 A level surface to which elevations are referenced, e.g., “mean sea level.”ĭatum, adjusted-The datum (reference surface) of a system of plane coordinates in a raised or lowered position from the initial datum on which the plane coordinate system was initially projected by mathematical procedures. Datum- 1Any numerical or geometrical quantity or set of such quantities which may serve as a reference or base for other quantities.
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