fix plots for southern domain (#231)

* fix plots for southern domain

* Update whats_new.rst

* Update whats_new.rst

cordex/accessor.py

@@ -162,7 +162,8 @@ def map(self, projection=None):
  """
  import cartopy.crs as ccrs
  import cartopy.feature as cf
- import cartopy.io.img_tiles as cimgt
+
+ # import cartopy.io.img_tiles as cimgt
  import matplotlib.pyplot as plt
 
  obj = self._obj
@@ -172,13 +173,20 @@ def map(self, projection=None):
  mapping.grid_north_pole_longitude,
  mapping.grid_north_pole_latitude,
  )
- transform = ccrs.RotatedPole(*pole)
+ central_longitude = 0.0
+ if obj.cf["X"].min() > 0.0:
+ central_longitude = 180.0
+
+ transform = ccrs.RotatedPole(*pole, central_rotated_longitude=central_longitude)
+
  if projection is None:
  projection = transform
+
  ax = plt.axes(projection=projection)
  # use google maps tiles
- request = cimgt.GoogleTiles()
- ax.add_image(request, 4) # , interpolation='spline36', regrid_shape=2000)
+ ax.stock_img()
+ # request = cimgt.GoogleTiles()
+ # ax.add_image(request, 4) # , interpolation='spline36', regrid_shape=2000)
  ax.gridlines(
  draw_labels=True,
  linewidth=0.5,
@@ -187,10 +195,15 @@ def map(self, projection=None):
  ylocs=range(-90, 90, 5),
  )
  ax.set_extent(
- [obj.rlon.min(), obj.rlon.max(), obj.rlat.min(), obj.rlat.max()],
+ [
+ obj.rlon.min() - central_longitude,
+ obj.rlon.max() - central_longitude,
+ obj.rlat.min(),
+ obj.rlat.max(),
+ ],
  crs=transform,
  )
- ax.coastlines(resolution="50m", color="black", linewidth=1)
+ ax.coastlines(resolution="110m", color="black", linewidth=1)
  ax.add_feature(cf.BORDERS, color="black")
 
  return ax

docs/whats_new.rst

@@ -6,11 +6,12 @@ What's New
 UNRELEASED
 ----------
 
+This release introduces the :py:meth:`cell_area` function and adds the ``cell_area`` keyword in :py:meth:`cordex_domain`.
+
 New Features
 ~~~~~~~~~~~~
 
 - Added :py:meth:`cell_area` which computes the cell area of a regular grid, e.g., the cell area in the rotated coordinates of a CORDEX dataset (:pull:`230`).
-
 - New keyword ``cell_area`` in :py:meth:`cordex_domain` which will add a cell area coordinate (:pull:`230`).
 
 Internal Changes
@@ -25,6 +26,9 @@ Internal Changes
 Bugfixes
 ~~~~~~~~
 
+.. currentmodule:: xarray
+
+- Fix :py:meth:`Dataset.cx.map` for the southern hemisphere (:pull:`231`).
 - Ensure ssl verification for VG2500 fetching (:pull:`206`, :pull:`212`).
 - Fix ``flox`` method in cmor module (:pull:`197`).
 
@@ -36,6 +40,8 @@ Patch release that fixes installation and cmor issues.
 Bugfixes
 ~~~~~~~~
 
+.. currentmodule:: cordex
+
 - Fix ``packages`` argument in ``setup.cfg`` (:pull:`192`).
 - Fixed empty mapping_table argument in :py:meth:`cmor.cmorize_variable` (:pull:`187`).