# Central Cylindrical Projection

## Classification

Cylindrical

## Graticule

Meridians: Equally spaced straight parallel lines.

Parallels: Unequally spaced straight parallel lines, perpendicular
to the meridians. Spacing increases toward the poles, more rapidly
than that of the Mercator projection.

Poles: Cannot be shown.

Symmetry: About any meridian or the Equator.

## Features

This is a perspective projection from the center of the Earth
onto a cylinder tangent at the Equator. It is not equal-area, equidistant,
or conformal. Scale is true along the Equator and constant between
two parallels equidistant from the Equator. Scale becomes infinite
at the poles. There is no distortion along the Equator, but it increases
rapidly away from the Equator.

## Parallels

For cylindrical projections, only one standard parallel is specified.
The other standard parallel is the same latitude with the opposite
sign. For this projection, the standard parallel is by definition
fixed at 0º.

## Remarks

The origin of this projection is unknown; it has little use
beyond the educational aspects of its method of projection and as
a comparison to the Mercator projection, which is not perspective.
The transverse aspect of the Central Cylindrical is called the Wetch
projection.

## Limitations

This projection is available only on the sphere. Data at latitudes
greater than 75º is trimmed to prevent large values from dominating
the display.

## Example

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