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The State Plane Coordinate System

The State Plane Coordinate System (SPS or SPCS) is a set of 124 geographic zones or coordinate systems designed for specific regions of the United States. Each state contains one or more state plane zones, the boundaries of which usually follow county lines. There are 110 zones in the continental US, with 10 more in Alaska, 5 in Hawaii, and one for Puerto Rico and US Virgin Islands. The system is widely used for geographic data by state and local governments. Its popularity is due to at least two factors. First, it uses a simple Cartesian coordinate system to specify locations rather than a more complex spherical coordinate system (the geographic coordinate system of latitude and longitude). By thus ignoring the curvature of the Earth, "plane surveying" methods can be used, speeding up and simplifying calculations. Second, the system is highly accurate within each zone (error less than 1:10,000). Outside a specific state plane zone accuracy rapidly declines, thus the system is not useful for regional or national mapping.

Most state plane zones are based on either a Transverse Mercator projection or a Lambert conformal conic projection. The choice between the two map projections is based on the shape of the state and its zones. States that are long in the east-west direction are typically divided into zones that are also long east-west. These zones use the Lambert conformal conic projection, because it is good at maintaining accuracy along an east-west axis. Zones that are long in the north-south direction use the Transverse Mercator projection because it is better at maintaining accuracy along a north-south axis. The panhandle of Alaska, whose maximum dimension is on a diagonal, uses an Oblique Mercator projection, which minimizes the combined error in the X and Y directions.

All State Plane zones in New Jersey

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County or City SPCS27 Code SPCS83 Code
Atlantic 12900 2900
Bergen 12900 2900
Burlington 12900 2900
Camden 12900 2900
Cape May 12900 2900
Cumberland 12900 2900
Essex 12900 2900
Gloucester 12900 2900
Hudson 12900 2900
Hunterdon 12900 2900
Mercer 12900 2900
Middlesex 12900 2900
Monmouth 12900 2900
Morris 12900 2900
Ocean 12900 2900
Passaic 12900 2900
Salem 12900 2900
Somerset 12900 2900
Sussex 12900 2900
Union 12900 2900
Warren 12900 2900

Click here to go back to the list off all State Plane grids