The Tobler hyperelliptical projection is a family of pseudocylindrical projections used for mapping the earth. The Mercator projection shows courses of constant bearing as straight lines. ... This article is about Earth as a planet. ...

It is named for Waldo R. Tobler, its inventor. Waldo Tobler received his degrees in Geography from the University of Washington in Seattle, spent several years at the University of Michigan and is currently Professor Emeritus at the University of California in Santa Barbara. ...

It is an equal-area projection. In the normal aspect, the parallels of latitude are parallel straight lines whose spacing is calculated to provide the equal-area property; the meridians of longitude (except for the central meridian, which is a straight line perpendicular to the lines representing parallels) are curves of the form a|x|^γ + b|y|^γ = 1 (with a dependent on longitude and b constant for a given map). When γ=2 the projection becomes the Mollweide projection; when γ=1 it becomes the Collignon projection; the limiting case as γ→infinity is the Cylindrical equal-area projection (Lambert cylindrical equal-area, Gall-Peters, or Behrmann projection). Values of γ that are favored by Tobler and others are generally greater than 2. The Mercator projection shows courses of constant bearing as straight lines. ... On the Earth, a circle of latitude is an imaginary east-west circle that connects all locations with a given latitude. ... Latitude,usually denoted symbolically by the Greek letter phi, , gives the location of a place on Earth north or south of the equator. ... A line, or straight line, is, roughly speaking, an (infinitely) thin, (infinitely) long, straight geometrical object, i. ... On the earth, a meridian is a north-south line between the North Pole and the South Pole. ... Longitude is the east-west geographic coordinate measurement most commonly utilized in cartography and global navigation. ... Example of a Mollweide projection. ... The Collignon Projection is a pseudocylindrical map projection first known to be published by Édouard Collignon in 1865 and subsequently cited by A. Tissot in 1881. ... Map of the Earth using a Lambert Cylindrical projection The Lambert cylindrical equal-area projection, or Lambert cylindrical projection, is a cylindrical, equal area map projection. ... Peters map The Gall-Peters projection is one specialization of a configurable equal-area map projection known as the equal-area cylindric or cylindrical equal-area projection. ... Map of the Earth using a Behrmann projection The Behrmann Projection is a cylindrical map projection. ...

The projection was first described by Tobler in 1973. For the song by James Blunt, see 1973 (song). ...

External reference

Tobler, Waldo (1973). "The hyperelliptical and other new pseudocylindrical equal area map projections". Journal of Geophysical Research 78 (11): pp. 1753-1759.