cdm/src/main/java/ucar/nc2/dataset/NetcdfDataset.java
public void clearCoordinateSystems() {
    coordSys = new ArrayList<>();
    coordAxes = new ArrayList<>();
    coordTransforms = new ArrayList<>();

    for (Variable v : getVariables()) {
      VariableEnhanced ve = (VariableEnhanced) v;
      ve.clearCoordinateSystems(); // ??
    }

    enhanceMode.remove(Enhance.CoordSystems);
  }
public void clearCoordinateSystems() {
    coordSys = new ArrayList<>();
    coordAxes = new ArrayList<>();
    coordTransforms = new ArrayList<>();

    for (Variable v : getVariables()) {
      VariableEnhanced ve = (VariableEnhanced) v;
      ve.clearCoordinateSystems(); // ??
    }

    enhanceMode.remove(Enhance.CoordSystems);
  }
Clear Coordinate System metadata, to allow them to be redone