The Bottomley map projection is an equal area map projection defined as:
and φ is the latitude, λ is the longitude from the central meridian, and φ1 is the given parallel of the projection which determines its shape, all in radians.
Parallels (i.e. lines of latitude) are concentric elliptical arcs of constant eccentricity equal to cos φ1, centred on the north pole. On the central meridian, shapes are not distorted, but elsewhere they are. Different projections can be produced by altering the eccentricity of the arcs, making it vary between the sinusoidal projection and the Werner projection.
|Wikimedia Commons has media related to Maps with Bottomley projection.|
|This cartography or mapping term article is a stub. You can help Wikipedia by expanding it.|