CPP Coordinate System

A CPP (Carte Parallelo-Grammatique Projection) system is a local system. The origin of the system must be defined in latitude/longitude decimal degrees.

The conversion from of a point from latitude/longitude to CPP is:

newpoint_x = R * (point_longitude - origin_longitude) * cos(origin_latitude)

newpoint_y = point_latitude * R

The conversion of a point from CPP to latitude/longitude is:

newpoint_longitude = origin_longitude + point_x / (R * cos(origin_latitude))

newpoint_latitude = point_y / R

R = 6378206.4 m. (Clarke 1866 major spheroid radius)

See also

• Coordinate Systems