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  2. List of map projections - Wikipedia

    en.wikipedia.org/wiki/List_of_map_projections

    Lines of constant bearing (rhumb lines) are straight, aiding navigation. Areas inflate with latitude, becoming so extreme that the map cannot show the poles. 2005 Web Mercator: Cylindrical Compromise Google: Variant of Mercator that ignores Earth's ellipticity for fast calculation, and clips latitudes to ~85.05° for square presentation. De ...

  3. Figure of the Earth - Wikipedia

    en.wikipedia.org/wiki/Figure_of_the_Earth

    Earth's topographic surface is apparent with its variety of land forms and water areas. This topographic surface is generally the concern of topographers, hydrographers, and geophysicists. While it is the surface on which Earth measurements are made, mathematically modeling it while taking the irregularities into account would be extremely ...

  4. Goode homolosine projection - Wikipedia

    en.wikipedia.org/wiki/Goode_homolosine_projection

    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, most commonly of the major oceans. Its equal-area property makes it useful for presenting spatial distribution of phenomena.

  5. Earth ellipsoid - Wikipedia

    en.wikipedia.org/wiki/Earth_ellipsoid

    The ellipsoid is defined by the equatorial axis (a) and the polar axis (b); their radial difference is slightly more than 21 km, or 0.335% of a (which is not quite 6,400 km). Many methods exist for determination of the axes of an Earth ellipsoid, ranging from meridian arcs up to modern satellite geodesy or the analysis and interconnection of ...

  6. Mercator projection - Wikipedia

    en.wikipedia.org/wiki/Mercator_projection

    For example, a Mercator map printed in a book might have an equatorial width of 13.4 cm corresponding to a globe radius of 2.13 cm and an RF of approximately ⁠ 1 / 300M ⁠ (M is used as an abbreviation for 1,000,000 in writing an RF) whereas Mercator's original 1569 map has a width of 198 cm corresponding to a globe radius of 31.5 cm and an ...

  7. Equal Earth projection - Wikipedia

    en.wikipedia.org/wiki/Equal_Earth_projection

    The Equal Earth map projection is an equal-area pseudocylindrical global map projection, invented by Bojan Šavrič, Bernhard Jenny, and Tom Patterson in 2018. It is inspired by the widely used Robinson projection , but unlike the Robinson projection, retains the relative size of areas.

  8. World map - Wikipedia

    en.wikipedia.org/wiki/World_map

    A world map is a map of most or all of the surface of Earth. World maps, because of their scale, must deal with the problem of projection. Maps rendered in two dimensions by necessity distort the display of the three-dimensional surface of the Earth. While this is true of any map, these distortions reach extremes in a world map.

  9. Geodetic Reference System 1980 - Wikipedia

    en.wikipedia.org/wiki/Geodetic_Reference_System_1980

    The quantity f = (a−b)/a, where b is the semi-minor axis (polar radius), is a purely geometrical one. The mechanical ellipticity of the earth (dynamical flattening, symbol J 2) is determined to high precision by observation of satellite orbit perturbations. Its relationship with the geometric flattening is indirect.