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Interpret inverse_flattening = 0 as spherical datum in mapping.py #1920

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merged 8 commits into from
Jul 1, 2021
Merged

Interpret inverse_flattening = 0 as spherical datum in mapping.py #1920

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31947c2
Fixing inverseflattening = 0, failing test_globe_spheroid()
lbunting Jun 18, 2021
7d9fe94
Interpret 0 inverse_flattening as a spherical datum
lbunting Jun 24, 2021
320c31e
Updated to fix lines with too many characters
lbunting Jun 24, 2021
fce695a
added tests in test_mapping.py for L66-L67 in mapping.py
lbunting Jun 29, 2021
c76c672
Fixed spacing issues in test
lbunting Jun 29, 2021
bd52c37
Corrected spacing/formatting issues
lbunting Jun 29, 2021
11d098f
Added blank line at L12
lbunting Jun 29, 2021
a5f57fc
changed test: semi_major_axis and semi_minor_axis instead of earth_ra…
lbunting Jun 30, 2021
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11 changes: 9 additions & 2 deletions src/metpy/plots/mapping.py
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Original file line number Diff line number Diff line change
Expand Up @@ -49,16 +49,23 @@ def cartopy_globe(self):
if 'earth_radius' in self._attrs:
kwargs = {'ellipse': 'sphere', 'semimajor_axis': self._attrs['earth_radius'],
'semiminor_axis': self._attrs['earth_radius']}

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Looks like a stray change crept in here.

else:
attr_mapping = [('semimajor_axis', 'semi_major_axis'),
('semiminor_axis', 'semi_minor_axis'),
('inverse_flattening', 'inverse_flattening')]
kwargs = self._map_arg_names(self._attrs, attr_mapping)

# WGS84 with semi_major==semi_minor is NOT the same as spherical Earth
# Also need to handle the case where we're not given any spheroid
# Override CartoPy's default ellipse setting depending on whether
# we have any metadata to map about the spheroid.
kwargs['ellipse'] = None if kwargs else 'sphere'

# interpret the 0 inverse_flattening as a spherical datum
# and don't pass the value on.
if kwargs.get('inverse_flattening', None) == 0:
kwargs['ellipse'] = 'sphere'
kwargs.pop('inverse_flattening', None)

return ccrs.Globe(**kwargs)

@property
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