How to 'zoom' to a specific area in an osmnx plot

问题

I have a osmnx plot that has two routes, but the map is quite vast therefore I cannot see the routes properly. Is there a fast way to limit my plot, to sort of 'zoom in', using for example bbox? I know I could search for districts instead of a whole city, I was just curious to know if there was a fastest way to 'zoom' in the plot.

Here is the code:

import osmnx as ox
import igraph as ig
import matplotlib.pyplot as plt
import pandas as pd
import networkx as nx
import numpy as np
import matplotlib as mpl
import random as rd
from IPython.display import clear_output
import matplotlib.cm as cm
ox.config(log_console=True, use_cache=True)

%%time
city = 'Portugal, Lisbon'
G = ox.graph_from_place(city, network_type='drive', simplify=True)

G_nx = nx.relabel.convert_node_labels_to_integers(G)
weight = 'length'
nodes, edges = ox.graph_to_gdfs(G_nx, nodes=True, edges=True)
origin = [8371, 5983, 6301, 9086]

orig = origin[1]
dest = 9590
route_1 = nx.shortest_path(G_nx, orig, dest, weight='length')
route_2 = nx.shortest_path(G_nx, dest, orig, weight='length')

fig, ax = ox.plot_graph_routes(G_nx, routes=[route_1, route_2], route_colors=['r', 'y'],
                               route_linewidth=6, node_size=0, figsize=(20,20))

Here is the plot:

回答1:

Pass a bbox (bounding box) as a keyword arg to plot_graph_routes, which will pass it along to plot_graph via plot_graph_route as described in the docs. The documentation explains that you can thus constrain a plot to a bounding box, and this is demonstrated in the example notebooks.

import networkx as nx
import osmnx as ox
ox.config(use_cache=True, log_console=True)

# get a graph
G = ox.graph_from_place('Piedmont, CA, USA', network_type='drive')

# get 2 shortest paths
r1 = nx.shortest_path(G, list(G)[0], list(G)[-1], weight='length')
r2 = nx.shortest_path(G, list(G)[10], list(G)[-10], weight='length')

# constrain plot to a bounding box
pt = ox.graph_to_gdfs(G, edges=False).unary_union.centroid
bbox = ox.utils_geo.bbox_from_point((pt.y, pt.x), dist=500)
fig, ax = ox.plot_graph_routes(G, [r1, r2], ['y', 'r'], bbox=bbox)

来源：https://stackoverflow.com/questions/62819355/how-to-zoom-to-a-specific-area-in-an-osmnx-plot

标签

matplotlib

networkx

osmnx