MercatorLatitudeScale¶
- class MercatorLatitudeScale(thresh=85.0)[source]¶
Bases:
_Scale
,ScaleBase
Axis scale that is linear in the Mercator projection latitude. Adapted from this 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
.
See also
Methods Summary
limit_range_for_scale
(vmin, vmax, minpos)Return the range vmin and vmax limited to within +/-90 degrees (exclusive).