Goode homolosine projection Tissot indicatrix

The Goode homolosine projection (or interrupted Goode homolosine projection) is a

pseudocylindrical In cartography, map projection is the term used to describe a broad set of Transformation (function) , transformations employed to represent the two-dimensional curved Surface (mathematics), surface of a globe on a Plane (mathematics), plane. In ...

, equal-area, composite

map projection In cartography, map projection is the term used to describe a broad set of transformations employed to represent the two-dimensional curved surface of a globe on a plane. In a map projection, coordinates, often expressed as latitude and longitud ...

used for

world map A world map is a map of most or all of the surface of Earth. World maps, because of their scale, must deal with the problem of map projection, projection. Maps rendered in two dimensions by necessity distort the display of the three-dimensiona ...

s. Normally it is presented with multiple interruptions. Its equal-area property makes it useful for presenting spatial distribution of phenomena.

Development

The projection was developed in 1923 by

John Paul Goode John Paul Goode (21 November 1862 – 5 August 1932), a geographer and cartographer, was one of the key geographers in American geography’s Incipient Period from 1900 to 1940 (McMaster and McMaster 306). Goode was born in Stewartville, Minneso ...

to provide an alternative to the

Mercator projection The Mercator projection () is a cylindrical map projection presented by Flemish geographer and cartographer Gerardus Mercator in 1569. It became the standard map projection for navigation because it is unique in representing north as up and sou ...

for portraying global areal relationships. Goode offered variations of the interruption scheme for emphasizing the world’s land and the world’s oceans. Some variants include extensions that repeat regions in two different lobes of the interrupted map in order to show Greenland or eastern Russia undivided. The homolosine evolved from Goode’s 1916 experiments in interrupting the

Mollweide projection 400px, Mollweide projection of the world 400px, The Mollweide projection with Tissot's indicatrix of deformation The Mollweide projection is an equal-area, pseudocylindrical map projection generally used for maps of the world or celestial sph ...

. Because the Mollweide is sometimes called the "homolographic projection" (meaning, ''equal-area map''), Goode fused the two names " homolographic" and "

sinusoidal A sine wave, sinusoidal wave, or just sinusoid is a mathematical curve defined in terms of the '' sine'' trigonometric function, of which it is the graph. It is a type of continuous wave and also a smooth periodic function. It occurs often in m ...

" (from the sinusoidal projection) to create the name "homolosine". Common in the 1960s, the Goode homolosine projection is often called an "orange-peel map" because of its resemblance to the flattened rind of a hand-peeled orange. In its most common form, the map interrupts the North Atlantic, the South Atlantic, the South Pacific, the Indian Ocean, and the entire east/west meridian of the map.

Details

Up to latitudes 40°44′11.8″N/S, the map is projected according to the

sinusoidal projection The sinusoidal projection is a pseudocylindrical equal-area map projection, sometimes called the Sanson–Flamsteed or the Mercator equal-area projection. Jean Cossin of Dieppe was one of the first mapmakers to use the sinusoidal, appearing in ...

’s transformation. The higher latitudes are the top sections of a

, grafted to the sinusoidal midsection where the scale of the two projections matches. This grafting results in a kink in the meridians along the parallel of the graft. The projection’s equal-area property follows from the fact that its source projections are themselves both equal-area.

References

External links

Table of examples and properties of all common projections
from radicalcartography.net.
Non-interrupted Goode Homolosine example (PDF)
{{Map projections Map projections Equal-area projections

Development

Details

See also

References

Further reading

External links