Parameters: Anchor point 1, Anchor point 2
Geocart menu class: Azimuthal
Neither conformal nor equal area
Meridians: Straight lines
Parallels: Equator is straight. Other parallels are ellipses, parabolas, or hyperbolas.
Poles: Points (if shown)
Symmetry: Normally none
Varies considerably. Projection should not be used for measuring distance
Direction is correct to all other points from two central points at which there is no distortion.
Great circles are shown as straight lines. This projection can be obtained by compressing a Gnomonic projection in the direction parallel to the line joining the two central points.
Could be used to locate a ship at sea, for example, if the exact location of two radio transmitters and the direction from the ship to the transmitters are known
Presented by Hans Maurer (1868-1945) of Germany in 1914 and Charles F. Close (1865-1952) of England independently in 1922
If the two central points are identical, the Gnomonic projection results.
Gnomonic, which can be compressed as described above to produce the Two-Point Azimuthal projection
Description adapted from J.P. Snyder and P.M. Voxland, An Album of Map Projections, U.S. Geological Survey Professional Paper 1453. United States Government Printing Office: 1989.