This is a Vector data set. The map projection used is Lambert Conformal Conic. The horizontal datum used is NAD27. The semi-major axis of the ellipsoid used is 6378206.4 meters. This is an alphanumeric combination of degrees north and west with a row column index applied to each 1 degree by 1 degree area.
Values are in decimal degrees.
Q100 - Indicates if arc is also a boundary for a 30' x 60' quad. This data set was created to serve as base map information. Data are appropriate for use at a regional scale and are intended as a reference. Data are not appropriate as a geodetic or engineering base. Tics were generated as well, one at each quad corner.