Us Coast And Geodetic Survey Historical Compilation

Cover Us Coast And Geodetic Survey Historical Compilation
Us Coast And Geodetic Survey Historical Compilation
U.S. Coast And Geodetic Survey
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Quaintance with the blending and inter-relation of the varied work, the following terse synopsis, which was submitted to the joint commission, may give some slight idea of how little of the indispensable work falls within the scope of nautical func- tions, and how incapable even that little is of being separated from its various auxilliary operations : The field work of the Geodetic Survey is in eight different lines, all but one (the fifth) of which are necessary to the production of a per- fe...ct map. These divisions are: First. Triangulation, including base measurements, by means of which distances between prominent points are made known.
Second. Astronomical observations, by means of which directions of all measured lines are made known, and also the locations of points on the earth are made known by astronomically measuring their dis- tance from the equator (latitude), and their distance from a prime me- ridian (longitude).
Third. Leveling, by means of which the heights of objects above mean level of the sea are made known.


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