gnomonic projection
See Also: projection
[map projections] A planar projection, tangent to the earth at one point, projected from the center of the globe.
Gnomonic projections are used in seismic work because seismic waves tend to travel along great circles. They are also used by navies in plotting direction finding bearings, since radio signals travel along great circles.
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Gnomonic projection
A gnomonic projection is an azimuthal projection obtained by projecting the earth onto a plane that touches the earth at a single point, using an imaginary light source located at the earth's center.
Gnomonic projection The Gnomonic (also known as central azimuthal) projection is neither conformal nor equal-area. The scale increases rapidly with the distance from the center.
Gnomonic projection on a truncated octahedron, flat-colored (43 KB)
Gnomonic projection on a truncated octahedron, unshaded, paint it yourself (37 KB)
Gnomonic projection on a truncated octahedron, topographic relief data by the USGS (207 KB) ...
Gnomonic projection
Lambert conformal conic projection (used extensively in aviation)
Map projection
Mollweide projection
Nautical chart
Robinson projection
Reversed map
Transverse Mercator projection
Winkel Tripel projection ...
For the GNOMONIC projection, the perspective point (like a source of light rays), is the centre of the Earth.
If a light source inside the globe projects the graticule onto the plane the result would be a planar, or azimuthal, map projection. If the imaginary light is inside the globe a Gnomonic projection results, if the light is antipodal a Sterographic, ...
 See also: Projection, Map, Globe, Map Projection, Parallel
  
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