Full Answer
What is a Mollweide projection on a map?
The Mollweide projection is a pseudo-cylindrical, equal area projection. Scale is constant along any given parallel, and true along 40°44' north and south. The central longitude is half the length of the equator. This projection was designed to produce aesthetically pleasing world maps. Specifies the units used in the map.
What is a sinusoidal interrupted Mollweide projection?
A sinusoidal interrupted Mollweide projection discards the central meridian in favor of alternating half-meridians which terminate at right angles to the equator. This has the effect of dividing the globe into lobes.
What is distortion Mollweide?
Distortion Mollweide is an equal-area (equivalent) projection. Shapes, directions, angles, and distances are generally distorted. Points 40°44' north and south at the central meridian have zero distortion.
What is Mollweide auxiliary sphere in ArcGIS Pro?
Mollweide auxiliary sphere is available in ArcGIS Pro 1.0 and later and in ArcGIS Desktop 9.3 and later. For ellipsoids this variant uses a sphere specified by the Auxiliary Sphere Type parameter and spherical equations.
What is the Mollweide projection?
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.
When was Mollweide created?
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. Esri. The Mollweide map projection is shown centered on Greenwich.
What is projection outline?
The projection outline forms a shape of an ellipse. The poles are presented as points and they are covertices of the ellipse (on the minor axis). The graticule is symmetric across the equator and the central meridian.
What type of sphere is used for an ellipsoid of revolution?
For an ellipsoid of revolution, the equal-area property is only maintained with the Mollweide auxiliary sphere variant when the Auxiliary Sphere Type 3 is used. Otherwise, areas are not maintained for the ellipsoids.
Is Mollweide a pseudocylindric projection?
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.
Is Mollweide a distortion?
Distortion. Mollweide is an equal-area (equivalent) projection. Shapes, directions, angles, and distances are generally distorted. Points 40°44' north and south at the central meridian have zero distortion. The scale is correct along the 40°44' north and south parallels and constant along any given parallel.
Is Mollweide available in ArcGIS Pro?
There are two variants available in ArcGIS. Both implementations correctly support sphere-based Earth models. Mollweide is available in ArcGIS Pro 1.0 and later and in ArcGIS Desktop 8.0 and later. For ellipsoids this variant uses the semimajor axis and spherical equations.
What is a pseudo-cylindrical projection?
One example of a pseudo-cylindrical projection is the Mollweide projection, developed and published by Karl Brandan Mollweide in 1805.
What is map projection?
A map projection is a technique of presenting the entire globe’s surface on a flat plane or area. Different types of map projections exist, including pseudo-cylindrical, cylindrical, conic, planar, and hybrid projections.
When was the projection invented?
The projection was first published in 1805 and reinvented by Jacque Babinet in 1857, who renamed it homalographic projection. World Map - Mollweide Projection.
What is the elliptical projection?
Mollweide, also known as homalographic, Babinet, or elliptical projection, is an equal-area projection that displays the globe as an eclipse with an axes proportion of 2:1. This projection is used appropriately where accurate areas are required rather than accurate shapes and angles. The projection was first published in 1805 ...
Does Mollweide have distortion?
However, points around the 40 degrees north and south at the center meridian do not have distortion. The bulging outward meridians cause considerable distortions near the projection’s edges.
What is the Mollweide projection?
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 type of sphere is used for an ellipsoid of revolution?
For an ellipsoid of revolution, the equal-area property is only maintained with the Mollweide auxiliary sphere variant when the Auxiliary Sphere Type 3 is used. Otherwise, areas are not maintained for the ellipsoids.