topojson.core.join¶

Join ¶

Bases: Extract

This class targets the following objectives: 1. Quantization of input linestrings if necessary 2. Identifies junctions of shared paths

The join function is the second step in the topology computation. The following sequence is adopted: 1. extract 2. join 3. cut 4. dedup 5. hashmap

Parameters:

Name	Type	Description	Default
`data`	`_any_ geometric type`	Geometric data, as for `Extract`	required
`options`	`dict or TopoOptions`	Options of the topology, see `Topology`	`None`

Returns:

Type	Description
`dict`	Output of `Extract` with the key `junctions`, and `transform` if quantized

to_dict()

Convert the Join object to a dictionary.

to_svg(separate=False, include_junctions=False)

Display the linestrings and junctions as SVG.

Parameters:

Name	Type	Description	Default
`separate`	`boolean`	If `True`, each of the linestrings will be displayed separately. Default is `False`	`False`
`include_junctions`	`boolean`	If `True`, the detected junctions will be displayed as well. Default is `False`	`False`