General Stereographic

This map projection is a conformal, azimuthal projection. It is mainly used with a projection center in one of the poles. Then meridians appear as straight lines and cross latitudes at a right angle. Unlike the azimuthal equidistant projection, the distances in this projection are not displayed in correct proportions. It is often used as a hemisphere map like the Lambert Azimuthal Equal Area projection.

slon0/lat0[/horizon]/scale or Slon0/lat0[/horizon]/width

lon0/lat0 specifies the projection center, the optional horizon parameter specifies the max distance from projection center (in degrees, < 180, default 90).

This projection can be displayed:

• With map boundaries coinciding with longitude and latitude: region specified via xmin/xmax/ymin/ymax
• As a map with rectangular boundaries: region specified as lower left and upper right corner xlleft/ylleft/xuright/yurightr. Note the appended r.

import pygmt

fig = pygmt.Figure()
fig.coast(region="4/14/52/57", projection="S0/90/4.5i", frame="ag", land="gray")
fig.show()