cdm/src/main/java/ucar/nc2/ft/point/standard/CoordSysEvaluator.java
static public CoordinateAxis findCoordByType(NetcdfDataset ds, AxisType atype, Predicate p) {
    // try the "best" coordinate system
    CoordinateSystem use = findBestCoordinateSystem(ds);
    if (use == null) return null;
    CoordinateAxis result = findCoordByType(use.getCoordinateAxes(), atype, p);
    if (result != null) return result;

    // try all the axes
    return findCoordByType(ds.getCoordinateAxes(), atype, p);
  }
static public CoordinateAxis findCoordByType(NetcdfDataset ds, AxisType atype, Predicate p) {
    // try the "best" coordinate system
    CoordinateSystem use = findBestCoordinateSystem(ds);
    if (use == null) return null;
    CoordinateAxis result = findCoordByType(use.getCoordinateAxes(), atype, p);
    if (result != null) return result;

    // try all the axes
    return findCoordByType(ds.getCoordinateAxes(), atype, p);
  }
search for Axis by Type and test against a predicate
@param ds search in this dataset's "Best" coordinate system.
@param atype search for this type of CoordinateAxis.
@param p match this predicate; may be null
@return the found CoordinateAxis, or null if none