MercatorLatitudeScale¶
-
class
MercatorLatitudeScale
(thresh=85.0)[source]¶ Bases:
proplot.scale._Scale
,matplotlib.scale.ScaleBase
Axis scale that transforms coordinates as with latitude in the Mercator projection. Adapted from this matplotlib example. The scale function is as follows:
\[y = \ln(\tan(\pi x \,/\, 180) + \sec(\pi x \,/\, 180))\]The inverse scale function is as follows:
\[x = 180\,\arctan(\sinh(y)) \,/\, \pi\]- Parameters
thresh (float, optional) – Threshold between 0 and 90, used to constrain axis limits between
-thresh
and+thresh
.
Attributes Summary
The registered scale name
Methods Summary
limit_range_for_scale
(vmin, vmax, minpos)Return the range vmin and vmax limited to within +/-90 degrees (exclusive).