code: @Pure
  	public static double toESRI_m(double measure) {
  		if (Double.isInfinite(measure) || Double.isNaN(measure)) {
  			return ESRI_NAN;
  		}
  		return measure;
  	}
docs: Translate a M-coordinate from Java standard
  to ESRI standard.
  
  @param measure is the Java z-coordinate
  @return the ESRI m-coordinate