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 ( ! SimpleUnit.isCompatible( units, "degrees_north")) return null;
trajConfig.setLatVar( var);
// Check for variable longitude(time) with units of "deg".