cdm/src/main/java/ucar/nc2/units/SimpleUnit.java
public double getValue() {
    if (!(uu instanceof ScaledUnit)) return Double.NaN;
    ScaledUnit offset = (ScaledUnit) uu;
    return offset.getScale();
  }
public double getValue() {
    if (!(uu instanceof ScaledUnit)) return Double.NaN;
    ScaledUnit offset = (ScaledUnit) uu;
    return offset.getScale();
  }
Extract the value, can only be called for ScaledUnit.
@return value of this unit if ScaledUnit, else NaN