在部分区域周围添加边框，matplotlib/geopandas

Question

我要一张显示斯德哥尔摩市镇的地图。显示如下。


fig, ax = plt.subplots(1, figsize=(4, 4))

matplotlib.rcParams["figure.dpi"] = 250
ax.axis('off')

ax1 = geo_df1.plot(edgecolor='black', column=geo_df1.rel_grp, cmap=my_cmp, linewidth=0.3, ax=ax, categorical=True)#, 

plt.show(ax1)

我想在东方添加一个放大的边界。像这样的东西。我如何在 matplotlib 中执行此操作？

Answer 1

问题不包括几何，所以有来源
这是绘制作为东边的 LineString 的简单案例。已经为示例目的生成了一个

import requests
import geopandas as gpd
import shapely.ops
import shapely.geometry
res = requests.get("http://data.insideairbnb.com/sweden/stockholms-län/stockholm/2021-10-29/visualisations/neighbourhoods.geojson")

# get geometry of stockholm
gdf = gpd.GeoDataFrame.from_features(res.json()).set_crs("epsg:4326")

# plot regions of stockholm
ax = gdf.plot()

# get linestring of exterior of all regions in stockhold
ls = shapely.geometry.LineString(shapely.ops.unary_union(gdf["geometry"]).exterior.coords)
b = ls.bounds
# clip boundary of stockholm to left edge
ls = ls.intersection(shapely.geometry.box(*[x-.2 if i==2 else x  for i,x in enumerate(b)]))

# add left edge to plot
gpd.GeoSeries(ls).plot(edgecolor="yellow", lw=5, ax=ax)

在部分区域周围添加边框，matplotlib/geopandas

Add a border around parts of a region, matplotlib/geopandas

python

matplotlib

geometry

geopandas