Index: /issm/trunk-jpl/src/m/classes/mask.m
===================================================================
--- /issm/trunk-jpl/src/m/classes/mask.m	(revision 24867)
+++ /issm/trunk-jpl/src/m/classes/mask.m	(revision 24868)
@@ -7,5 +7,5 @@
 	properties (SetAccess=public) 
 		ocean_levelset = NaN;
-		ice_levelset         = NaN;
+		ice_levelset   = NaN;
 	end
 	methods (Static)
@@ -17,4 +17,20 @@
 			if numel(self.ice_levelset)>1 & all(self.ice_levelset>=0),
 				disp('WARNING: md.mask.ice_levelset>=0, you probably need to change the sign of this levelset');
+			end
+
+			%2020 May 15th
+			if isstruct(self)
+            selfnew = mask();
+            if isfield(self,'ice_levelset')
+               selfnew.ice_levelset = self.ice_levelset;
+            end
+            if isfield(self,'ocean_levelset')
+               selfnew.ocean_levelset = self.ocean_levelset;
+            end
+            if isfield(self,'groundedice_levelset')
+               disp('WARNING: md.mask.groundedice_levelset is now md.mask.ocean_levelset ');
+               selfnew.ocean_levelset = self.groundedice_levelset;
+            end
+            self = selfnew;
 			end