def convert_lng_positive_in_west(longitudes_deg, allow_nan=True):
"""Converts longitudes so that all WH values are positive.
In other words, all values in WH are from 180...360 deg E.
:param longitudes_deg: scalar or numpy array of longitudes (deg E).
:param: allow_nan: Boolean flag. If True, NaN longitudes will be allowed.
:return: longitudes_positive_in_west_deg: Same as input, except that
longitudes in WH are positive.
"""
was_input_array = isinstance(longitudes_deg, numpy.ndarray)
if not was_input_array:
longitudes_deg = numpy.full(1, longitudes_deg)
error_checking.assert_is_valid_lng_numpy_array(longitudes_deg,
allow_nan=allow_nan)
longitudes_positive_in_west_deg = copy.deepcopy(longitudes_deg)
longitudes_positive_in_west_deg[
longitudes_positive_in_west_deg < 0.] += 360.
if was_input_array:
return longitudes_positive_in_west_deg
return longitudes_positive_in_west_deg[0]
def test_assert_is_valid_lng_numpy_array_negative_in_west_true(self):
"""Checks assert_is_valid_lng_numpy_array; negative_in_west_flag = True.
In this case, longitudes in western hemisphere are negative.
"""
error_checking.assert_is_valid_lng_numpy_array(
LNG_NUMPY_ARRAY_NEGATIVE_IN_WEST_DEG, negative_in_west_flag=True)
def test_assert_is_valid_lng_numpy_array_negative_in_west_false(self):
"""Checks assert_is_valid_lng_numpy_array; negative_in_west_flag = True.
In this case, longitudes in western hemisphere are positive.
"""
with self.assertRaises(ValueError):
error_checking.assert_is_valid_lng_numpy_array(
LNG_NUMPY_ARRAY_POSITIVE_IN_WEST_DEG,
negative_in_west_flag=True)
def test_assert_is_valid_lng_numpy_array_true(self):
"""Checks assert_is_valid_lng_numpy_array; all longitudes valid."""
error_checking.assert_is_valid_lng_numpy_array(LNG_NUMPY_ARRAY_DEG)
def test_assert_is_valid_lng_numpy_array_some_invalid(self):
"""Checks assert_is_valid_lng_numpy_array; some longitudes invalid."""
with self.assertRaises(ValueError):
error_checking.assert_is_valid_lng_numpy_array(
LNG_NUMPY_ARRAY_SOME_INVALID_DEG)