Interrupted Goode Homolosine

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Interrupted Goode Homolosine projection is an equal area pseudocylindrical projection developed by J.P. Goode in 1923. The projection is interrupted to reduce distortion of major land areas. This projection is a combination of the Mollweide projection (also called Homolographic) used for higher latitudes, and the Sinusoidal projection (Goode 1925) used for lower latitudes. The two projections join at 40° 44’11.8" North and South, where the linear scale of the projections match. This projection is suitable for thematic or distribution mappings of the entire world, and has been chosen for two USGS projects: Global Advanced Very High Resolution Radiometer (AVHRR) 1-km data set project, and AVHRR Pathfinder project.

Source: United States Geological Survey (USGS) 2009.

Construction

Pseudocylindrical

Property

Equal-area

Meridians

"In the interrupted form, there are six central meridians, each a straight line 0.22 as long as the Equator but not crossing the Equator. Other meridians are equally spaced sinusoidal curves between latitudes 40° 44’ N and S. and elliptical arcs elsewhere, all concave toward the central meridian. There is a slight bend in meridians at the 40° 44’ latitudes" (Snyder and Voxland, 1989).

Parallels

Parallels are straight parallel lines, which are perpendicular to the central meridians. Between latitudes 40° 44’ N and S, they are equally spaced. Parallels gradually get closer together closer to the poles.

Graticule spacing

See Meridians and Parallels. Poles are points. Symmetry is nonexistent in the interrupted form.

Linear scale

Scale is true at each latitude between 40° 44’ N and S along the central meridian within the same latitude range. Scale varies with increased latitudes.

Uses

World maps.

Source: Snyder and Voxland, 1989

Interrupted Goode Homolosine Projection

map_projection_interrupted_goode

Source: Snyder and Voxland, 1989