momepy.nx_to_gdf#

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

Convert a networkx.Graph to a LineString GeoDataFrame and Point GeoDataFrame.

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

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

Parameters:

netnetworkx.Graph: A networkx.Graph object.
pointsbool (default is True): Export point-based gdf representing intersections. When converting continuity-based graph generated using momepy.coins_to_nx(), points represent edges with no associated geometry.
linesbool (default is True): Export line-based gdf representing streets or continuity strokes.
spatial_weightsbool (default is False): Set to True to export a libpysal spatial weights for nodes (only for primal graphs).
nodeIDstr: The name of the node ID column to be generated.

Returns:

GeoDataFrame: The 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 the primal Graph to points as intersections and lines as street segments:

>>> points, lines = momepy.nx_to_gdf(graph)
>>> 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 the relationship between points/nodes as a libpysal W object:

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

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

>>> G = momepy.gdf_to_nx(df, approach="dual")
>>> lines = momepy.nx_to_gdf(graph)
>>> 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.nx_to_gdf#

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