cdm/src/main/java/ucar/nc2/dt/grid/GridCoordSys.java
@Override
  public boolean isZPositive() {
    if (vertZaxis == null) return false;
    if (vertZaxis.getPositive() != null) {
      return vertZaxis.getPositive().equalsIgnoreCase(ucar.nc2.constants.CF.POSITIVE_UP);
    }
    if (vertZaxis.getAxisType() == AxisType.Height) return true;
    return vertZaxis.getAxisType() != AxisType.Pressure;
  }
@Override
  public boolean isZPositive() {
    if (vertZaxis == null) return false;
    if (vertZaxis.getPositive() != null) {
      return vertZaxis.getPositive().equalsIgnoreCase(ucar.nc2.constants.CF.POSITIVE_UP);
    }
    if (vertZaxis.getAxisType() == AxisType.Height) return true;
    return vertZaxis.getAxisType() != AxisType.Pressure;
  }
@ Override public boolean isZPositive ( ) { if ( vertZaxis == null ) return false ; if ( vertZaxis . getPositive ( ) != null ) { return vertZaxis . getPositive ( ) . equalsIgnoreCase ( ucar . nc2 . constants . CF . POSITIVE_UP ) ; } if ( vertZaxis . getAxisType ( ) == AxisType . Height ) return true ; return vertZaxis . getAxisType ( ) != AxisType . Pressure ; }
true if increasing z coordinate values means "up" in altitude
true if increasing z coordinate values means up in altitude