Strike data should be a pd.DF from the WWLN data files read by
        read_WWLN()

def get_map(self, create_html=True):
        """Strike data should be a pd.DF from the WWLN data files read by
        read_WWLN()"""
        strike_data = self.df
        num_rows = len(self.df)
        if num_rows > 1000:
            print("Warning, you have requested lots of data be mapped." /
                  " Limiting your request to the first 1,000 rows" /
                  " as this is currently only a preview feature.")
            strike_data = self.df[0:1000]
        m = folium.Map(location=[0.0, 0.01], zoom_start=2)
        marker_cluster = folium.MarkerCluster().add_to(m)
        for event in strike_data.index:
            self.add_to_map(map_obj=m,
                            date_time=strike_data.dt[event],
                            cluster_obj=marker_cluster,
                            lat=strike_data.geometry[event].y,
                            lon=strike_data.geometry[event].x,
                            key=event)
        if create_html:
            data_date = strike_data.dt[0].split()[0]
            m.save('map_{0}.html'.format(data_date))
        return m