Remove spurious in dem_to_mesh_gridded

opendm/mesh.py

@@ -125,7 +125,7 @@ def dem_to_mesh_gridded(inGeotiff, outMesh, maxVertexCount, verbose=False, maxCo
 
     system.run('"{reconstructmesh}" -i "{infile}" '
          '-o "{outfile}" '
-         '--remove-spikes 0 --remove-spurious 0 --smooth 0 '
+         '--remove-spikes 0 --remove-spurious 20 --smooth 0 '
          '--target-face-num {max_faces} '.format(**cleanupArgs))
 
     # Delete intermediate results