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
A Guide to the Astral Plane A Guide to the Astral Plane A Guide to the Astral Plane is an accessory for the 2nd edition of the "Advanced Dungeons & Dragons" fantasy tabletop role-playing game, published in 1996. The book explains rules for astral travel, zero-gravity combat and spellcasting in the astral plane. The mid-section of the book provides information on the Githyanki, the indigenous species on the Astral, which is suggested as an optional player race. The final section of the guide deals with other creatures that live on the plane, and describes a few locations. Trenton Webb reviewed "A Guide to the Astral Plane"