Adding a plugin for working around SciTools/iris#2927

hadgem_unknown_vars.py

@@ -0,0 +1,37 @@
+__author__ = 'watson-parris'
+from cis.data_io.products.HadGEM import HadGEM_PP
+
+
+class HadGEM_unknown_vars(HadGEM_PP):
+
+    def get_variable_names(self, filenames, data_type=None):
+        import iris
+        import cf_units as unit
+        from cis.utils import single_warnings_only
+        # Removes warnings and prepares for future Iris change
+        iris.FUTURE.netcdf_promote = True
+
+        variables = []
+
+        # Filter the warnings so that they only appear once - otherwise you get lots of repeated warnings
+        with single_warnings_only():
+            cubes = iris.load(filenames)
+
+        for cube in cubes:
+            is_time_lat_lon_pressure_altitude_or_has_only_1_point = True
+            for dim in cube.dim_coords:
+                units = dim.units
+                if dim.points.size > 1 and \
+                        not units.is_time() and \
+                        not units.is_time_reference() and \
+                        not units.is_vertical() and \
+                        not units.is_convertible(unit.Unit('degrees')):
+                    is_time_lat_lon_pressure_altitude_or_has_only_1_point = False
+                    break
+            if is_time_lat_lon_pressure_altitude_or_has_only_1_point:
+                name = cube.var_name or cube.name()
+                if name == 'unknown' and 'STASH' in cube.attributes:
+                    name = '{}'.format(cube.attributes['STASH'])
+                variables.append(name)
+
+        return set(variables)