momepy.nx_to_gdf¶

momepy.nx_to_gdf(net, points=True, lines=True, spatial_weights=False, nodeID='nodeID')[source]¶

Convert networkx.Graph to LineString GeoDataFrame and Point GeoDataFrame.

Automatically detects an approach of the graph and assignes edges and nodes to relevant geometry type.

See the User Guide page Converting from GeoDataFrame to Graph and back for details.

Parameters

netnetworkx.Graph: networkx.Graph
pointsbool: export point-based gdf representing intersections
linesbool: export line-based gdf representing streets
spatial_weightsbool: export libpysal spatial weights for nodes (only for primal graphs)
nodeIDstr: name of node ID column to be generated

Returns

GeoDataFrame: Selected gdf or tuple of both gdfs or tuple of gdfs and weights

See also

gdf_to_nx

Examples

>>> import geopandas as gpd
>>> df = gpd.read_file(momepy.datasets.get_path('bubenec'), layer='streets')
>>> df.head(2)
                                            geometry
0  LINESTRING (1603585.640 6464428.774, 1603413.2...
1  LINESTRING (1603268.502 6464060.781, 1603296.8...
>>> G = momepy.gdf_to_nx(df)

Converting primal Graph to points as intersections and lines as street segments:

>>> points, lines = momepy.nx_to_gdf(G)
>>> points.head(2)
   nodeID                         geometry
0       1  POINT (1603585.640 6464428.774)
1       2  POINT (1603413.206 6464228.730)
>>> lines.head(2)
                     geometry      mm_len  node_start  node_end
0  LINESTRING (1603585.640...  264.103950           1         2
1  LINESTRING (1603561.740...   70.020202           1         9

Storing relationship between points/nodes as libpysal W object:

>>> points, lines, W = momepy.nx_to_gdf(G, spatial_weights=True)
>>> W
<libpysal.weights.weights.W object at 0x7f8d01837210>

Converting dual Graph to lines. Dual Graph does not export edges to GDF:

>>> G = momepy.gdf_to_nx(df, approach="dual")
>>> lines = momepy.nx_to_gdf(G)
>>> lines.head(2)
                                            geometry      mm_len
0  LINESTRING (1603585.640 6464428.774, 1603413.2...  264.103950
1  LINESTRING (1603607.303 6464181.853, 1603592.8...  199.746503

momepy.limit_range momepy.unique_id