MercatorLatitudeScale

class MercatorLatitudeScale(thresh=85.0)

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

ultraplot.constructor.Scale

Attributes Summary

name	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).

Attributes Documentation

name = 'mercator'

The registered scale name

Methods Documentation

limit_range_for_scale(vmin, vmax, minpos)

Return the range vmin and vmax limited to within +/-90 degrees (exclusive).