GeoProjection
is an option for GeoGraphics that specifies the cartographic projection to use for the map.
Details
- GeoProjection can use any projection "proj" or {"proj",params}, where "proj" is any of the entities of GeoProjectionData and params are parameter rules like "StandardParallels"{33,60}. GeoProjectionData["proj"] gives the default values of the parameters for the projection "proj".
- GeoGraphics[…,GeoProjectionAutomatic] chooses a projection automatically. It will be "Mercator" for small scales, "LambertAzimuthal" for intermediate scales, and "Equirectangular" for large scales. It also chooses the "Centering" and "GridOrigin" parameters automatically.
- The projection is applied to the geo background of the GeoGraphics map, as well as to its geo primitives, like GeoPath or GeoDisk.
- AbsoluteOptions can be used to give explicit projection information for a GeoProjection with Automatic setting.
Examples
open allclose allBasic Examples (5)
Scope (3)
Perform projections with default or automatic parameters:
Find out which parameters were used for the projection:
Specify your own projection parameters:
Project geo primitives with different projections:
In the equirectangular projection, the disk center is in the middle of the end points of the geodesic path:
In the Lambert azimuthal projection, the geodesic looks almost straight and the geo disk circular:
Properties & Relations (2)
When no explicit projection is requested, one is automatically chosen:
When one or more non-geo graphic primitives appear and no projection is explicitly requested, the equirectangular projection is always used:
Use GeoDisk, Line[{GeoPosition[…], …}], etc. to place correctly projected primitives on the map:
Alternatively, specify a projection explicitly to combine primitives with regular graphics on the same coordinate scale as projected geo graphics:
Study geo projection distortion of the graticules, the grid of lines of constant latitude and longitude:
Text
Wolfram Research (2014), GeoProjection, Wolfram Language function, https://reference.wolfram.com/language/ref/GeoProjection.html.
CMS
Wolfram Language. 2014. "GeoProjection." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/GeoProjection.html.
APA
Wolfram Language. (2014). GeoProjection. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/GeoProjection.html