Glossary for Geospatial Science

State Plane Coordinate System or SPCS:� The State Plane Coordinate System (SPCS) defines map coordinates by zone for the United States.� Each zone has one central meridian and scale factor, which permits all USGS quadrangle maps in a zone to be mosaicked exactly.� Zones with north-south extent use the Transverse Mercator projection, while those with east-west extent use Lambert Conformal Conic.� (The panhandle of Alaska is the only exception, and uses Oblique Mercator).