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The Mercator projection in normal aspect maps trajectories of constant bearing (called rhumb lines or loxodromes) on a sphere to straight lines on the map, and is thus uniquely suited to marine navigation: courses and bearings are measured using a compass rose or protractor, and the corresponding directions are easily transferred from point to ...
Image:BlankMap-World-v3.png – Version of v2, but using thin lines between islands owned by the same country so countries can be colored in one click – may be more convenient for converting large amounts of country data to a map.
The Lambert azimuthal projection was originally conceived as an equal-area map projection. It is now also used in disciplines such as geology to plot directional data, as follows. A direction in three-dimensional space corresponds to a line through the origin. The set of all such lines is itself a space, called the real projective plane in ...
If the azimuthal equidistant projection map is centered about a point whose antipodal point lies on land and the map is extended to the maximum distance of 20,000 km (12,427 mi) the antipode point smears into a large circle. This is shown in the example of two maps centered about Los Angeles, and Taipei.
The Schmidt net's horizontal axis can then be used as a scalar measuring device to convert the point's latitude (relative to the pole) into a radial distance from the centre of the circle. Alternatively, the Schmidt net could be replaced entirely with a correctly projected polar grid, and grid squares from a map re-drawn into this disc.
In cartography, a map projection is any of a broad set of transformations employed to represent the curved two-dimensional surface of a globe on a plane. [1] [2] [3] In a map projection, coordinates, often expressed as latitude and longitude, of locations from the surface of the globe are transformed to coordinates on a plane.
Land borders and maritime boundaries are included and are tabulated separately and in combination. For purposes of this list, " maritime boundary " includes boundaries that are recognized by the United Nations Convention on the Law of the Sea , which includes boundaries of territorial waters , contiguous zones , and exclusive economic zones .
A graticule or grid (from Latin crāticula 'grill/grating'), on a map, is a graphical depiction of a coordinate system as a grid of coordinate curves or "lines", each curve/line representing a constant coordinate value. [1] It is thus a form of isoline, and is commonly found on maps of many kinds, at scales from local to global.