# Grids and Grid References (Google eBook)

Headquarters, Department of the Army, 1967 - Grids (Cartography) - 193 pages

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Page 31 - A worldwide position reference system that may be applied to any map or chart graduated in latitude and longitude regardless of projection. It is a method of expressing latitude and longitude in a form suitable for rapid reporting and plotting. (This term is derived from the words "The World Geographic Reference System...
Page 5 - Every circle is supposed to be divided into 360 equal parts, called degrees. Each degree is divided into 60 minutes, and each minute into 60 seconds.
Page 80 - ... neglecting terms of any particular order. The best geodetic tables available are those for Latitude Functions on the various spheroids (natural values of the meridional arc; A, B, C, D, E and F factors; radii of curvature, R and N) produced by the Army Map Service in 1944. They tabulate the required functions to an accuracy of a millimetre at an interval of 1 minute of arc.
Page 21 - VERTICAL grid line to LEFT of point and read LARGE figures labeling the line either in the top or bottom margin, or on the line itself: Estimate tenths from grid line to point: 2. Locate first HORIZONTAL grid line BELOW point and read LARGE figures labeling the line either in the left or right margin, or on the line itself: Estimate tenths from grid line to point...
Page 5 - ... been said (p. 15) that a circle may be divided into 360 parts, or degrees. One-fourth of 360 is 90; and since the distance from the equator to either pole is onefourth of that around the earth, there are just 90° from the equator to either pole. Accordingly the circles of latitude in each hemisphere are numbered from 0° at the equator to 90° at the poles. Since the circumference of the earth is about 25,000 miles, dividing that by 360 makes the length of each degree of latitude about 69 miles....
Page 35 - Except for the values labeling the first grid line in each direction from the southwest corner of the sheet, the last three digits (000) of the values are omitted.
Page 17 - For convenience, the world is divided into large, regularly shaped geographic areas, each of which is given a unique identification, called the Grid Zone Designation (fig.
Page 20 - R alphabetically from left to right; in both cases the letters / and 0 are omitted and, to avoid confusion with 100,000-meter squares in adjoining UTM zones, the letters D, E, M, N, V and W are also omitted. Starting at the 80° parallel and reading toward...
Page 5 - The figure of the earth is not considered a sphere, but a spheroid (an ellipsoid of revolution), flattened at the poles and bulging at the equator.
Page 66 - If reporting beyond 100,000 meters or if sheet bears an overlapping grid, prefix 100,000 Meter Square Identification, as...