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Expose +gamma for Oblique Mercator #2627

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Expose +gamma for Oblique Mercator #2627

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8 changes: 7 additions & 1 deletion lib/cartopy/crs.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3160,7 +3160,7 @@ class ObliqueMercator(Projection):

def __init__(self, central_longitude=0.0, central_latitude=0.0,
false_easting=0.0, false_northing=0.0,
scale_factor=1.0, azimuth=0.0, globe=None):
scale_factor=1.0, azimuth=0.0, gamma=None, globe=None):
"""
Parameters
----------
Expand All @@ -3178,6 +3178,9 @@ def __init__(self, central_longitude=0.0, central_latitude=0.0,
azimuth: optional
Azimuth of centerline clockwise from north at the center point of
the centre line. Defaults to 0.
gamma: optional
Azimuth of centerline clockwise from north of the rectified bearing
of centre line. If omitted, `alpha` determines the values of `gamma`.
globe: optional
An instance of :class:`cartopy.crs.Globe`. If omitted, a default
globe is created.
Expand All @@ -3198,6 +3201,9 @@ def __init__(self, central_longitude=0.0, central_latitude=0.0,
('x_0', false_easting), ('y_0', false_northing),
('alpha', azimuth), ('units', 'm')]

if gamma is not None:
proj4_params.append(('gamma', gamma))

super().__init__(proj4_params, globe=globe)

# Couple limits to those of Mercator - delivers acceptable plots, and
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