Equal Area Cylindrical Projection

Classification: Cylindrical

Available forms: Forward and Inverse, spherical and ellipsoidal

Defined area: Global

Alias: cea

Domain: 2D

Input type: Geodetic coordinates

Output type: Projected coordinates

Projection String

+proj=cea
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Named Specializations

The Equal Area Cylindrical projection is sometimes known under other names when instantiated with particular values of the lat_ts parameter:

• Lambert cylindrical equal-area: lat_ts = 0
• Behrmann: lat_ts = 30
• Gall-Peters: lat_ts = 45

Optional Parameters

• lat_ts: Latitude of true scale
• lon_0: Longitude of origin
• ellps: Ellipsoid
• R: Radius of the sphere
• k_0: Scaling factor
• x_0: False easting
• y_0: False northing

Note: lat_ts and k_0 are mutually exclusive. If lat_ts is specified, it is equivalent to setting k_0 to:

$$k_0 = \cos(lat_{ts}) / \sqrt{1 - e^2 \sin^2(lat_{ts})}$$

reference: "Cartographic Projection Procedures for the UNIX Environment- A User's Manual" by Gerald I. Evenden, USGS Open File Report 90-284and Release 4 Interim Reports (2003)