What is a Mollweide projection used for?
The Mollweide projection is an equal-area pseudocylindrical map projection displaying the world in a form of an ellipse with axes in a 2:1 ratio. It is also known as Babinet, elliptical, homolographic, or homalographic projection. The projection is appropriate for thematic and other world maps requiring accurate areas.
What does the Mollweide projection distort?
Distortion. Mollweide is an equal-area (equivalent) projection. Shapes, directions, angles, and distances are generally distorted. Bulging outer meridians produce considerable distortion toward the edge of the projection, especially at high latitudes.
What is Goode’s interrupted projection used for?
The Goode homolosine projection (or interrupted Goode homolosine projection) is a pseudocylindrical, equal-area, composite map projection used for world maps. Normally it is presented with multiple interruptions. Its equal-area property makes it useful for presenting spatial distribution of phenomena.
What is a Pseudocylindrical projection?
Introduction. Pseudocylindrical projections for world maps are characterized by straight hori- zontal lines for parallels of latitude and (usually) equally-spaced curved meridians of longitude. They are therefore related to cylindrical projections in which meridians are straight instead of curved.
What does Pseudocylindrical mean?
Filters. (cartography) Representing the central meridian and each parallel as a single straight line segment, but not the other meridians.
What are the disadvantages of a Mercator map?
Disadvantages: Mercator projection distorts the size of objects as the latitude increases from the Equator to the poles, where the scale becomes infinite. So, for example, Greenland and Antarctica appear much larger relative to land masses near the equator than they actually are.
What kind of projection is the Mollweide projection?
Mollweide projection. The Mollweide projection is an equal-area, pseudocylindrical map projection generally used for global maps of the world or night sky.
How is the central meridian projected in Mollweide?
Mollweide is a pseudocylindric projection. The equator and the central meridian are projected as two perpendicular straight lines. The central meridian is half the length of the projected equator. Two meridians, 90° east and 90° west of the central meridian, project as a circle.
When did Karl Brandan Mollweide create the projection?
The projection trades accuracy of angle and shape for accuracy of proportions in area, and as such is used where that property is needed, such as maps depicting global distributions. The projection was first published by mathematician and astronomer Karl (or Carl) Brandan Mollweide (1774–1825) of Leipzig in 1805.
When was the first version of Mollweide made?
The projection is appropriate for thematic and other world maps requiring accurate areas. Mollweide was first introduced by Karl B. Mollweide in 1805. It is available in ArcGIS Pro 1.0 and later and in ArcGIS Desktop 8.0 and later.
