Creating graph using OSMNX from geodataframe and shows error 'TypeError: cannot unpack non-iterable int object'

Question

我使用 osmnx 下载地图并导出为 geopackages，以便我可以在 QGIS 中对其进行编辑。编辑好后（主要是把CRS改成GCJ-02），想把编辑好的边和节点导入osmnx做图做一些路由。

我使用

导入了它们

 geopandas.read_file()，

并使用

转换为图表

osmnx.utils_graph.graph_from_gdfs(gdf_nodes, gdf_edges, graph_attrs=None)

这是错误：

road = ox.utils_graph.graph_from_gdfs(nodes, edges)
D:\Programs\Anaconda\envs\myenv\lib\site-packages\osmnx\utils_graph.py:155: UserWarning: discarding the gdf_nodes geometry column, though its values differ from the coordinates in the x and y columns
  warnings.warn(
Traceback (most recent call last):

  File "C:\Users\Ricedumplings\AppData\Local\Temp\ipykernel_34123169980.py", line 1, in <cell line: 1>
    road = ox.utils_graph.graph_from_gdfs(nodes, edges)

  File "D:\Programs\Anaconda\envs\myenv\lib\site-packages\osmnx\utils_graph.py", line 169, in graph_from_gdfs
    for (u, v, k), attr_vals in zip(gdf_edges.index, gdf_edges.values):

文件 edge.gpkg 看起来像：

edges.iloc[1]
Out[51]: 
u                                                   436912662
v                                                   436912681
key                                                         0
osmid       [337786597, 337786554, 337786537, 337786507, 3...
oneway                                                   True
lanes                                                       3
ref                                                     G4202
name                                                    四环路南段
highway                                              motorway
length                                               1635.288
bridge                                                    yes
from                                                436912681
to                                                  436912662
tunnel                                                       
width                                                        
maxspeed                                                     
access                                                       
junction                                                     
geometry    LINESTRING (104.11850662686128 30.568117399805...
Name: 1, dtype: object

文件 nodes.gpkg 看起来像：

nodes.iloc[1]
Out[52]: 
osmid                                               436912681
y                                                   30.570557
x                                                  104.115972
street_count                                                3
highway                                                      
ref                                                          
geometry        POINT (104.11850662686128 30.568117399805935)
Name: 1, dtype: object

有人知道出了什么问题吗？谢谢！

我在网上查了一下，看到了一些解决办法，但是都是改代码。又因为我是个业余爱好者，犹豫要不要改osmnx的代码，所以一直没做。

顺便说一句，这是来自 'utils_graph.py' 的错误部分：

# add edges and their attributes to graph, but filter out null attribute
# values so that edges only get attributes with non-null values
attr_names = gdf_edges.columns.to_list()
for (u, v, k), attr_vals in zip(gdf_edges.index, gdf_edges.values):
    data_all = zip(attr_names, attr_vals)
    data = {name: val for name, val in data_all if isinstance(val, list) or pd.notnull(val)}
    G.add_edge(u, v, key=k, **data)

Answer 1

根据您的描述，这个警告是完全可以预料的。如果修改了节点的几何形状，没有让x和y属性保持一致。下面的示例代码最能说明问题。

第一次转换回图表生成警告
确保非规范化列与几何图形一致后的第二次转换不会生成警告

import osmnx as ox

# get a graph and geodataframes
G = ox.graph_from_address('Guangzhou, China', network_type= "drive")
gdf_nodes, gdf_edges = ox.graph_to_gdfs(G)

# this will make nodes inconsistent, x & y not equal to geometry
gdf_nodes["geometry"] = gdf_nodes.to_crs(gdf_nodes.estimate_utm_crs()).simplify(1000).to_crs(gdf_nodes.crs)

# hey presto - expected warning
ox.utils_graph.graph_from_gdfs(gdf_nodes, gdf_edges, graph_attrs=None)

# make nodes consistent...
gdf_nodes["x"] = gdf_nodes["geometry"].x
gdf_nodes["y"] = gdf_nodes["geometry"].y
ox.utils_graph.graph_from_gdfs(gdf_nodes, gdf_edges, graph_attrs=None)

Creating graph using OSMNX from geodataframe and shows error 'TypeError: cannot unpack non-iterable int object'

Creating graph using OSMNX from geodataframe and shows error 'TypeError: cannot unpack non-iterable int object'

python

graph

geopandas

osmnx