Function clearSpatialReferences

pdal/PointTable.hpp:77–78

        addSpatialReference(srs);
    }
    void clearSpatialReferences()
        { m_spatialRefs.clear(); }
    void addSpatialReference(const SpatialReference& srs);
    bool spatialReferenceUnique() const
        { return m_spatialRefs.size() <= 1; }