if ( var == null ) return null;
list = var.getDimensions();
if ( list.size() != 1 ) return null;
d = (Dimension) list.get( 0 );
if ( ! d.getName().equals( timeDimName ) ) return null;
units = var.findAttribute( "units" ).getStringValue();
if ( units.indexOf( "meters" ) == -1 ) return null; // "meters above Mean Sea Level" not udunits convertible
// if ( ! SimpleUnit.isCompatible( units, "m")) return( false);
((VariableEnhanced)var).setUnitsString("meters" );