State Plane Coordinates by Automatic Data Processing

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State Plane Coordinates by Automatic Data Processing

C. N. Claire

This publication contains tables and formulas for computing state plane coordinates by electronic data processing equipment. There are four different types of projection used in the plane coordinate systems of the United States and its territories. They are the Lambert conformal conic, transverse Mercator, oblique Mercator, and approximate azimuthal equidistant projections. These are all based on the Clarke Spheroid of 1866. The plane coordinates in all the projections, except the one used for Guam, are in U.S. Survey Feet (one U.S. Survey Foot equals 1200/3937 meter exactly). These tables contain the factors most difficult to compute, namely the radii of the parallels for the Lambert projection and values of Y on the central meridian for the parallels on the transverse Mercator projection. These are tabulated at intervals of one minute of latitude. In Alaska, the published plane coordinates for 2 1/2-minute intersections of meridians and parallels are used for converting geographic positions to plane coordinates and vice versa. The formulas in this publication are the same as the ones used in computing the projection tables. The essentials of the different projections are discussed separately in the text.