| Mapping Toolbox | |
Syntax
Graticule
Central Meridian: Straight line half as long as the Equator.
Other Meridians: Equally spaced sinusoidal curves intersecting at the poles and concave toward the central meridian.
Parallels: Unequally spaced straight parallel lines, perpendicular to the central meridian. Spacing is widest near the Equator.
Poles: Lines one-third as long as the Equator.
Symmetry: About the central meridian or the Equator.
Features
This projection is equal-area. Scale is true along the 55°51' parallels and is constant along any parallel and between any pair of parallels equidistant from the Equator. It is free of distortion only at the two points where the central meridian intersects the 55°51' parallels. This projection is not conformal or equidistant.
Parallels
For this projection, only one standard parallel is specified. The other standard parallel is the same latitude with the opposite sign. The standard parallel is by definition fixed at 55°51'.
Remarks
This projection was presented by F. Webster McBryde and Paul D. Thomas
in 1949.
| | McBryde-Thomas Flat-Polar Quartic Projection | Mercator Projection | |
