如何在geopandas地图上添加“指北针”

import matplotlib.pyplot as plt
import matplotlib.patches as mpatches
import matplotlib.lines as mlines
import geopandas as gpd

# 读取地图数据
gdf = gpd.read_file('path_to_shapefile') # 将"path_to_shapefile"替换为实际的地图数据文件路径

# 创建地图图像
fig, ax = plt.subplots(figsize=(10, 10))

# 绘制地图
gdf.plot(ax=ax)

# 获取地图的坐标范围
xmin, ymin, xmax, ymax = ax.axis()

# 计算指北针的位置
x = xmin + 0.05 * (xmax - xmin)
y = ymax - 0.05 * (ymax - ymin)

# 创建指北针对象
arrow = mpatches.Arrow(x, y, 0, 0.2, width=0.1, color='black')

# 添加指北针到地图
ax.add_patch(arrow)

# 绘制指北针上的文本标签
ax.text(x, y - 0.2, 'N', ha='center', va='center', fontsize=12, fontweight='bold')

plt.show()