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Mercator fix #174

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merged 9 commits into from
May 3, 2022
Merged

Mercator fix #174

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22fb45c
proj4 formatting update (#146)
michaelavs Aug 6, 2021
cf4f75b
units=hPa is used in /def get_slp():/
kwadrat Sep 21, 2021
9a812e0
Merge pull request #157 from kwadrat/develop
michaelavs Oct 8, 2021
5dd8414
Update Mercator projection attributes
michaelavs Feb 28, 2022
586ab30
remove empty test_mercator file
michaelavs Mar 3, 2022
f06bf9d
Fix Mercator projection issue
michaelavs Apr 29, 2022
43c40f0
Fix accidental extra indent and repeated 'if cartopy'
michaelavs Apr 29, 2022
feb7e62
Empty push to re-trigger checks
michaelavs Apr 29, 2022
9d9c24d
Empty to trigger builds
michaelavs May 2, 2022
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2 changes: 1 addition & 1 deletion src/wrf/g_slp.py
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Original file line number Diff line number Diff line change
Expand Up @@ -63,7 +63,7 @@ def get_slp(wrfin, timeidx=0, method="cat", squeeze=True,

units (:obj:`str`): The desired units. Refer to the :meth:`getvar`
product table for a list of available units for 'slp'. Default
is 'Pa'.
is 'hPa'.

Returns:

Expand Down
17 changes: 10 additions & 7 deletions src/wrf/projection.py
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,7 @@
from Ngl import Resources



if cartopy_enabled():
class MercatorWithLatTS(crs.Mercator):
"""A :class:`cartopy.crs.Mercator` subclass that adds support for
Expand Down Expand Up @@ -60,6 +61,10 @@ def __init__(self, central_longitude=0.0,
("units", "m")]
super(crs.Mercator, self).__init__(proj4_params, globe=globe)

# Need to have x/y limits defined for the initial hash which
# gets used within transform_points for caching
self._x_limits = self._y_limits = None

# Calculate limits.
limits = self.transform_points(
crs.Geodetic(),
Expand All @@ -76,14 +81,12 @@ def __init__(self, central_longitude=0.0,
else:
xlimits[0] = -xlimits[0]

self._xlimits = tuple(xlimits)
self._ylimits = tuple(limits[..., 1])

# Compatibility with cartopy >= 0.17
self._x_limits = self._xlimits
self._y_limits = self._ylimits
self._x_limits = tuple(xlimits)
self._y_limits = tuple(limits[..., 1])

self._threshold = np.diff(self.x_limits)[0] / 720
self._threshold = min(np.diff(self.x_limits)[0] / 720,
np.diff(self.y_limits)[0] / 360)


def _ismissing(val, islat=True):
Expand Down Expand Up @@ -824,7 +827,7 @@ def _cartopy(self):

def _proj4(self):
_proj4 = ("+proj=stere +units=m +a={} +b={} "
"+lat0={} +lon_0={} +lat_ts={} +nadgrids=@null".format(
"+lat_0={} +lon_0={} +lat_ts={} +nadgrids=@null".format(
Constants.WRF_EARTH_RADIUS,
Constants.WRF_EARTH_RADIUS,
self._hemi,
Expand Down