State Plane Coordinate System 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 contiguous 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
Smoothing plane Smoothing plane A smoothing plane or smooth plane is a type of bench plane used in woodworking. The smoothing plane is typically the last plane used on a wood surface. When used properly, it produces a finish that equals or surpasses that made by sandpaper. The smooth finish is the result of planing the wood off in strips, rather than by successive buffing and scratching. The smoothing plane is typically 8 to 10 inches long. The throat may be adjusted to a tight opening so as to allow only a very fine shaving and to reduce tearout of the grain