Change coastline data set from level 6 to level 5

 - This means Antarctic coastline is between ocean and ice
   instead of ocean and grounding line

compass/ocean/tests/global_ocean/wave_mesh/base_mesh.py

@@ -195,7 +195,7 @@ def distance_to_shapefile_points(self, lon, lat,
                                      sphere_radius, reggrid=False):
 
         # Get coastline coordinates from shapefile
-        features = cfeature.GSHHSFeature(scale='l', levels=[1, 6])
+        features = cfeature.GSHHSFeature(scale='l', levels=[1, 5])
 
         pt_list = []
         for feature in features.geometries():