Fix issue with alternativeRowScanning and mercator grid (#358)

ecmwf · Dec 1, 2023 · 540df98 · 540df98
1 parent a0ff19f
commit 540df98
Showing 1 changed file with 2 additions and 5 deletions.
diff --git a/cfgrib/dataset.py b/cfgrib/dataset.py
@@ -319,11 +319,8 @@ def get_values_in_order(message, shape):
     # type: (abc.Field, T.Tuple[int]) -> np.ndarray
     # inform the data provider to return missing values as missing_value
     values = message["values"]
-    if (
-        isinstance(values, np.ndarray)
-        and len(values.shape) == 2
-        and message.get("alternativeRowScanning", False)
-    ):
+    # for 2D array (lat/lon) re-arrange if alternative row scanning
+    if len(shape) == 2 and message.get("alternativeRowScanning", False):
         values = values.copy().reshape(shape)
         values[1::2, :] = values[1::2, ::-1]
         return values.flatten()