To represent a curved surface such as the Earth in two dimensions, you must geometrically transform (literally, and in the mathematical sense, "map") that surface to a plane. Such a transformation is called a map projection.
The following topics describe the basic properties of map projections, the surfaces onto which projections are developed, the types of parameters associated with different classes of projections, and how projected data can be mapped back to the sphere or spheroid it represents.
Most map projections in the toolbox are implemented as
MATLAB® functions; however, these are only used by certain
calling functions (such as
axesm), and thus
have no documented public API.
|Initialize or reset map projection structure|
|Convert GeoTIFF information to map projection structure|
|Available Mapping Toolbox map projections|
|List available map projections and verify names|
|Project geographic features to map coordinates|
|Unproject features from map to geographic coordinates|
|Map projections supported by projfwd and projinv|
|Direction angle in map plane from azimuth on ellipsoid|
|Azimuth on ellipsoid from direction angle in map plane|
A map projection transforms a curved surface such as the Earth onto a two-dimensional plane. All map projections introduce distortions compared to maps on globes.
Map projections are influenced and constrained by five characteristic properties: shape, distance, direction, scale, and area.
Most map projections can be categorized into three families based on the cylinder, cone, and plane geometric shapes.
Learn about the map projections supported by the toolbox, and their families and properties.
A projection aspect is the orientation of a map on the page or display screen. An orientation vector controls the map projection aspect.
Variable projection parameters control the appearance of map projections. Projection parameters include aspect, origin, and scale.
This example shows how to project latitude and longitude vectors into plane coordinates independently of displaying the projection.