- class MercatorLatitudeScale(thresh=85.0)[source]¶
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:\[x = 180\,\arctan(\sinh(y)) \,/\, \pi\]
float, optional) – Threshold between 0 and 90, used to constrain axis limits between
limit_range_for_scale(vmin, vmax, minpos)
Return the range vmin and vmax limited to within +/-90 degrees (exclusive).