grib/src/main/java/ucar/nc2/grib/coord/CoordinateBuilderImpl.java
@Override
  public int getIndex(T gr) {
    Integer result =  valMap.get( extract(gr));
    return (result == null) ? 0 : result;
  }
@Override
  public int getIndex(T gr) {
    Integer result =  valMap.get( extract(gr));
    return (result == null) ? 0 : result;
  }
Used by CoordinateND.makeSparseArray; not used by CoordinateTime2D