![]() Standard world projection of the NGS in 1922–1988.ĭistances along meridians are conserved, as is distance along one or two standard parallels. All parallels and meridians are circular arcs. Standard world projection for the NGS since 1998.īoundary is a circle. Variants are oblique versions, centred on 45°N.įormulated by using other equal-area map projections as transformations.Īrithmetic mean of the equirectangular projection and the Aitoff projection. Modified from azimuthal equal-area equatorial map. Stretching of modified equatorial azimuthal equidistant map. Developed for Bartholomew Ltd., The Times Atlas.įrom the designated centre, lines of constant bearing (rhumb lines/loxodromes) are straight and have the correct length. Parallels based on Gall stereographic, but with curved meridians. Parallels are unequal in spacing and scale. Distortion-free only where the standard parallels intersect the central meridian. Standard parallels at 33☄5′N/S parallels are unequal in spacing and scale meridians are fourth-order curves. ![]() ![]() Standard parallels at 36☄6′N/S parallels are unequal in spacing and scale 2:1 aspect. The equal-area projection that results from average of sinusoidal and Mollweide y-coordinates and thereby constraining the x coordinate. Hybrid of Collignon + Lambert cylindrical equal-area. ĭepending on configuration, the projection also may map the sphere to a single diamond or a pair of squares. Equivalent to Wagner VI horizontally compressed by a factor of 3 / 2. Hybrid of Sinusoidal and Mollweide projections.Įvenly spaced parallels. Parallels are unequal in spacing and scale meridians are half-period sinusoids. Parallels are unequal in spacing and scale outer meridians are semicircles other meridians are semiellipses. Meridians are sinusoids parallels are equally spaced. Practically unused in cartography because of severe polar distortion, but popular in panoramic photography, especially for architectural scenes. Similar is Balthasart with standard parallels at 50°N/S and Tobler’s world in a square with standard parallels around 55.66°N/S. Similar are Trystan Edwards with standard parallels at 37.4° and Smyth equal surface (=Craster rectangular) with standard parallels around 37.07°.Ĭylindrical equal-area projection with standard parallels at 45°N/S and an aspect ratio of π/2 ≈ 1.571. Intended to resemble the Mercator while also displaying the poles.Ĭylindrical equal-area projection with standard parallel at the equator and an aspect ratio of π (3.14).Ĭylindrical equal-area projection with standard parallels at 30°N/S and an aspect ratio of (3/4)π ≈ 2.356.Ĭylindrical equal-area projection with standard parallels at 37.5°N/S and an aspect ratio of 1.977. Intended to resemble the Mercator while also displaying the poles. Forms the basis of the Universal Transverse Mercator coordinate system. This transverse, ellipsoidal form of the Mercator is finite, unlike the equatorial Mercator. De facto standard for Web mapping applications. Variant of Mercator that ignores Earth's ellipticity for fast calculation, and clips latitudes to ~85.05° for square presentation. Areas inflate with latitude, becoming so extreme that the map cannot show the poles. Lines of constant bearing (rhumb lines) are straight, aiding navigation. Transverse of equidistant projection distances along central meridian are conserved.ĭistances perpendicular to central meridian are preserved. Plate carrée: special case having the equator as the standard parallel. Simplest geometry distances along meridians are conserved. Because there is no limit to the number of possible map projections, there can be no comprehensive list. This is a summary of map projections that have articles of their own on Wikipedia or that are otherwise notable. You can help by adding missing items with reliable sources. This is a dynamic list and may never be able to satisfy particular standards for completeness.
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