wiechel

Wiechel Projection

Classification

Pseudoazimuthal

Identifier

wiechel

Graticule

The graticule described is for a polar aspect.

Meridians: Equally spaced semicircles from pole to pole, concave toward the west.

Parallels: Concentric circles.

Pole: The central pole is a point; the other pole is a bounding circle.

Symmetry: Radially about the center point.

Features

This equal-area projection is a novelty map, usually centered at a pole, showing semicircular meridians in a pinwheel arrangement. Scale is correct along the meridians. This projection is not conformal.

Parallels

There are no standard parallels for azimuthal projections.

Remarks

• This projection was presented by H. Wiechel in 1879.

• This implementation of the Wiechel projection is applicable only for coordinates that are referenced to a sphere.

Limitations

Data greater than 65º distant from the center point is trimmed.

Example

landareas = shaperead('landareas.shp','UseGeoCoords',true);
axesm ('wiechel', 'Frame', 'on', 'Grid', 'on');
geoshow(landareas,'FaceColor',[1 1 .5],'EdgeColor',[.6 .6 .6]);
tissot;

Introduced before R2006a