Reverted back to haversine metric for BallTree

Author: stelliom

python/extpar_art_to_buffer.py

@@ -201,7 +201,7 @@ def get_fraction_per_soil_type(soil_id):
 logging.info("")
 
 lon_lat_array = np.column_stack((lons.ravel(), lats.ravel()))
-balltree = BallTree(lon_lat_array, metric="euclidean", leaf_size=3)
+balltree = BallTree(lon_lat_array, metric="haversine", leaf_size=3)
 
 ones = np.ones((raw_lon.size))