Add quick map plot for debugging (#69)

src/anemoi/utils/devtools.py

@@ -0,0 +1,71 @@
+# (C) Copyright 2024 Anemoi contributors.
+#
+# This software is licensed under the terms of the Apache Licence Version 2.0
+# which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
+#
+# In applying this licence, ECMWF does not waive the privileges and immunities
+# granted to it by virtue of its status as an intergovernmental organisation
+# nor does it submit to any jurisdiction.
+
+
+import cartopy.crs as ccrs
+import cartopy.feature as cfeature
+import matplotlib.pyplot as plt
+import matplotlib.tri as tri
+import numpy as np
+
+"""FOR DEVELOPMENT PURPOSES ONLY
+
+This module contains
+
+"""
+
+# TODO: use earthkit-plots
+
+
+def fix(lons):
+    return np.where(lons > 180, lons - 360, lons)
+
+
+def plot_values(values, latitudes, longitudes, title=None, **kwargs):
+
+    _, ax = plt.subplots(subplot_kw={"projection": ccrs.PlateCarree()})
+    ax.coastlines()
+    ax.add_feature(cfeature.BORDERS, linestyle=":")
+
+    missing_values = np.isnan(values)
+
+    values = values[~missing_values]
+    longitudes = longitudes[~missing_values]
+    latitudes = latitudes[~missing_values]
+    triangulation = tri.Triangulation(fix(longitudes), latitudes)
+
+    levels = kwargs.pop("levels", 10)
+
+    _ = ax.tricontourf(triangulation, values, levels=levels, transform=ccrs.PlateCarree())
+
+    options = dict(
+        levels=levels,
+        colors="black",
+        linewidths=0.5,
+        transform=ccrs.PlateCarree(),
+    )
+
+    options.update(kwargs)
+
+    ax.tricontour(
+        triangulation,
+        values,
+        **options,
+    )
+
+    if title is not None:
+        ax.set_title(title)
+
+    return ax
+
+
+def plot_field(field, title=None, **kwargs):
+    values = field.to_numpy(flatten=True)
+    latitudes, longitudes = field.grid_points()
+    return plot_values(values, latitudes, longitudes, title=title, **kwargs)