Nodes¶

Create nodes (points) from a GeoDataFrame of lines.

The functions are used inside inside other functions, and aren’t needed to use explicitly.

make_node_ids(gdf, wkt=True)[source]

Gives the lines unique node ids and returns lines (edges) and nodes.

Takes the first and last point of each line and creates a GeoDataFrame of nodes (points) with a column ‘node_id’. The node ids are then assigned to the input GeoDataFrame of lines as the columns ‘source’ and ‘target’.

Parameters:

gdf (GeoDataFrame) – GeoDataFrame with line geometries
wkt (bool) – If True (default), the resulting nodes will include the column ‘wkt’, containing the well-known text representation of the geometry. If False, it will include the column ‘coords’, a tuple with x and y geometries.

Return type:

tuple[GeoDataFrame, GeoDataFrame]

Returns:

A tuple of two GeoDataFrames, one with the lines and one with the nodes.

Note

The lines must be singlepart linestrings.