Projection surfaces used in classic cartography are cylindrical, conical, or plane. According to the projection surface used, map projection can be divided into cylindrical projection, conic projection and azimuthal projection correspondingly. Later, many modern map projections were developed, such as pseudocylindrical, polyconic and other projection methods. Choosing an appropriate map projection is an important task when mapping.
This article will briefly introduce each of the map projections supported in Cartopy, all of which are classes in cartopy.crs. To draw a map of a certain type of projection, just instantiate it and pass it the parameters of plt.axes() the method . projectionThis article does not cover the principle of projection, and aims to show the effect and usage of each map projection for reference when choosing.
Cylindrical projection
PlateCarree
The PlateCarree projection projects the objects onto a cylindrical surface and then expands them, and is often used to draw world maps. The class is defined as:
1 |
class cartopy.crs.PlateCarree(central_longitude=0.0, globe=None) |
Parameter Description:
-
central_longitude: the central meridian, the default is 0; -
globe: ellipsoid definition, default is WGS84.
Example:
LambertCylindrical
Lambert cylin