shapely介绍：

https://blog.csdn.net/wiborgite/article/details/85167397

geopandas介绍：

https://developer.ibm.com/zh/technologies/analytics/tutorials/working-with-geospatial-vector-data-in-python/

官方资料：https://geopandas.org/aggregation_with_dissolve.html

有一个geopandas的GeoDataFrame对象后：

python
g['all']=1
qq=g.dissolve(by="all",aggfunc="sum")
qq.plot()
plt.show()
f=qq.loc[1,"geometry"] #拿出图形
fg={"bianjie":list(f.exterior.coords)}  #外环边界
print(list(f.interiors))  #内环