Question

我想在地图上绘制Geopandas df。作为背景，我想要该区域的（道路）地图。热爱OSMnx程序包，我试图找出如何将其输出（shapefile？网络？）用作绘图背景

import osmnx as ox 
G= ox.core.graph_from_place('Chengdu City', network_type='all_private', 
                            simplify=True, retain_all=False, 
                            truncate_by_edge=False, name='unnamed', 
                            which_result=1, buffer_dist=None, timeout=180, 
                            memory=None, 
                            max_query_area_size=2500000000, 
                            clean_periphery=True, infrastructure='way["highway"]', custom_filter=None)

这是网络图，现在我要在其上绘制我的地理熊猫点（和线）：

dict= {'take_lat_1k': [31.47, 31.51, 30.54, 30.54],'take_lng_1k': [104.75, 104.67, 103.97, 103.97], 
     'return_lat_1k': [31.48, 31.49, 30.54, 30.54],'return_lng_1k': [104.71, 104.69, 103.97, 103.97]}
df= pd.DataFrame(dict)
# creating Geopandas geometries 
geometry_t = [Point(xy) for xy in zip(df["take_lng_1k"],df["take_lat_1k"])]
geometry_r = [Point(xy) for xy in zip(df["return_lng_1k"],df["return_lat_1k"])]
lines = [LineString(ab) for ab in zip (geometry_t, geometry_t)]

# osmnx network as the fig,ax
fig, ax = ox.plot_graph(G)

# creating Geodf
geo_df_t = gpd.GeoDataFrame(df, geometry=geometry_t)
geo_df_t.plot(ax=ax, markersize = 20, color = "red" , alpha=1)
geo_df_line = gpd.GeoDataFrame(df, geometry=lines)
geo_df_line.plot(ax=ax,  color = "black"  , alpha=1  )
geo_df_r = gpd.GeoDataFrame(df, geometry=geometry_r)
geo_df_r.plot(ax=ax, markersize = 20, color = "green"  , alpha=1    )
plt.show()

我得到的是漂亮的osmnx netwrok图，但是它们之间没有点和线。也出现在图像的底部：具有0个轴的图形尺寸432x288
我这样做正确吗？

Answer 1

在每个OSMnx documentation中，请使用show和close参数来防止在显示所有图形之前显示和关闭该图形。另外，为您的点和线设置更高的zorder，以确保它们绘制在底图的顶部而不是底图：

fig, ax = ox.plot_graph(G, show=False, close=False)
geo_df_t.plot(ax=ax, markersize = 20, color="red" , alpha=1, zorder=7)
geo_df_line.plot(ax=ax, color = "black", alpha=1, zorder=8)
geo_df_r.plot(ax=ax, markersize = 20, color="green", alpha=1, zorder=9)
plt.show()

GeoPandas和OSMnx-在地图上绘制

1 个答案: