visad/src/main/java/ucar/nc2/iosp/gempak/GempakLookup.java
public final boolean isPositiveUp(GridRecord gr) {
    int type = gr.getLevelType1();
    if ((type == 1) || (type == 5)) {
      return false;
    }
    return true;
  }
public final boolean isPositiveUp(GridRecord gr) {
    int type = gr.getLevelType1();
    if ((type == 1) || (type == 5)) {
      return false;
    }
    return true;
  }
is this a PositiveUp VerticalCoordinate.