cdm/src/main/java/ucar/nc2/dataset/CoordSysBuilder.java
protected void findCoordinateAxes(NetcdfDataset ncDataset) {
    for (VarProcess vp : varList) {
      if (vp.coordAxes != null)
        findCoordinateAxes(vp, vp.coordAxes);
      if (vp.coordinates != null)
        findCoordinateAxes(vp, vp.coordinates);
    }
  }
protected void findCoordinateAxes(NetcdfDataset ncDataset) {
    for (VarProcess vp : varList) {
      if (vp.coordAxes != null)
        findCoordinateAxes(vp, vp.coordAxes);
      if (vp.coordinates != null)
        findCoordinateAxes(vp, vp.coordinates);
    }
  }
Identify coordinate axes, set VarProcess.isCoordinateAxis = true.
Default is to look for those referenced by _CoordinateAxes attribute.
Note coordinate variables are already identified.

@param ncDataset why