Robinson projection

The Robinson projection is a map web design, which was developed in 1961 by the American cartographer Arthur H. Robinson.

The Robinson projection is a mediating figure. It does not represent the projection as such and it is not based as other card network designs (for example, Mercator projection) on a closed mathematical formula, but in a table of reference points which have been empirically determined. All points between these reference points are determined by interpolation.

The advantage of the Robinson projection is that it looks very natural and except at the poles has relatively small variations in angle and area. But it is this distortion in any area.

History

The Robinson projection is based on an inquiry by the U.S. Kartenverlag Rand McNally, who came up in 1961 to Robinson to select a projection that, among other conditions, continuous, distortion possible and " easy on the eyes " should be for the viewer. Robinson could not find a projection that met these criteria, and so Rand McNally commissioned the development of such.

Since the 1960s, the Robinson projection is used in maps from Rand McNally. The National Geographic Society used it from 1988 to 1998 for their world maps, sets since 1998, but instead the angle - Tripel projection a.

Specification

The following table of values ​​specifies the Robinson projection:

The PLEN column indicates the length of the projected width of the circle relative to the equatorial length. The PDFE column is the distance of the parallel of the equator, relative to the total height of the map. Since the Robinson projection has a width - to-height ratio of 1:0,5072, these values ​​have to be multiplied by 0.5072 to get the distance of the projected circle of latitude from the equator. On each parallel of the meridians are equidistant from each other.

  • Card network design
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