diff --git a/oceanmesh/geodata.py b/oceanmesh/geodata.py
index d7268d6..9f0a514 100644
--- a/oceanmesh/geodata.py
+++ b/oceanmesh/geodata.py
@@ -794,9 +794,9 @@ def __init__(self, dem, crs="EPSG:4326", bbox=None, extrapolate=False):
                     topobathy = np.transpose(topobathy, (1, 0))
             # Ensure its a floating point array
             topobathy = topobathy.astype(np.float64)
-            topobathy[
-                topobathy == nodata_value
-            ] = np.nan  # set the no-data value to nan
+            topobathy[topobathy == nodata_value] = (
+                np.nan
+            )  # set the no-data value to nan
         elif not dem.exists():
             raise FileNotFoundError(f"File {dem} could not be located.")
 
diff --git a/oceanmesh/idw.py b/oceanmesh/idw.py
index f71b8fa..a165118 100644
--- a/oceanmesh/idw.py
+++ b/oceanmesh/idw.py
@@ -1,6 +1,7 @@
 """ invdisttree.py: inverse-distance-weighted interpolation using KDTree
     fast, solid, local
 """
+
 from __future__ import division
 
 import numpy as np