What is a Mollweide map?
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.
Why do we use the Mollweide map?
Mollweide projection is commonly used in small-scale mapping and thematic maps to illustrate accurate area characteristics. Thus, it is used mainly on maps that require accurate areas as opposed to those requiring accurate shapes and angles. It can also be used to show distributions of global data.
What is a Mercator map Good For?
This projection is widely used for navigation charts, because any straight line on a Mercator projection map is a line of constant true bearing that enables a navigator to plot a straight-line course. …
What distortion do you see on a Mollweide map?
zero 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.
What does the Mollweide preserve?
The Mollweide projection is an equal-area map projection. It preserves the size of figures, but heavily distorts the shapes when getting nearer to the edge of the map. Mollweide maps are especially used for global maps where its equal-area property helps to display global distributions.
Why do we use the Robinson map?
The Robinson projection is unique. Its primary purpose is to create visually appealing maps of the entire world. It is a compromise projection; it does not eliminate any type of distortion, but it keeps the levels of all types of distortion relatively low over most of the map.
What are the advantages and disadvantages of the Mollweide projection?
It preserves the size of figures, but heavily distorts the shapes when getting nearer to the edge of the map. Mollweide maps are especially used for global maps where its equal-area property helps to display global distributions.
What are two positive aspects of the Mercator map projection?
Advantages of Mercator’s projection: – preserves angles and therefore also shapes of small objects – close to the equator, the distortion of lengths and areas is insignificant – a straight line on the map corresponds with a constant compass direction, it is possible to sail and fly using a constant azimuth – simple …
Does Google Maps use Mercator?
It’s a change that allows the map to more accurately display the Earth. Up until now, Google Maps has used Mercator projection, which projects the planet onto a flat surface. While this style makes it easy to print onto maps and has largely become standardized, it presents a distorted image of the Earth.
How is a Mercator map made?
In 1569, Mercator developed a better, more accurate projection. Although the execution was difficult, the basic idea was simple: Imagine a globe with a paper cylinder wrapped around it — Mercator projected that globe onto the paper and then unwrapped it.
Is Mollweide projection conformal?
It is free of distortion only at the two points where the 40º44′ parallels intersect the central meridian. This projection is not conformal or equidistant.
How is the Robinson map distorted?
The Robinson projection is neither conformal nor equal-area. It generally distorts shapes, areas, distances, directions, and angles. Angular distortion is moderate near the center of the map and increases toward the edges. Distortion values are symmetric across the equator and the central meridian.
When to use a Mollweide for a world map?
The Mollweide projection is appropriate for small-scale mapping, especially for thematic world maps illustrating area characteristics and analysis requiring accurate areas.
Which is the best description of 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.
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.
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.
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