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mattijn avatar mattijn commented on June 20, 2024 1

This is now supported by means of multiple geo-dataframes per #169 and is documented here: https://mattijn.github.io/topojson/example/input-types.html#list-of-geodataframes.

Usage for above mentioned example can be declared as such:

from topojson import Topology
topo = Topology(
    data=[regions, municipalities],  # can be either a GeoDataFrame or a GeoJSON FeatureCollection  
    object_name=['regions', 'municipalities']
)

Documentation is here:

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mattijn avatar mattijn commented on June 20, 2024

No, that is not supported. But it would be cool. I know topojson supports multiple layers with single declared arcs, but I don't know what a good approach would be to handle this usecase. Any suggestions or approaches are much welcome!

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kvalev avatar kvalev commented on June 20, 2024

Thanks for the quick response! Unfortunately, I wont be of much help, as I am very much a newbie wrt to topojson. I just stumbled upon it, because one data visualization tool requires it.

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natsuapo avatar natsuapo commented on June 20, 2024

One simple solution: you can first merge the geojsons / geo-dataframes together and distinguish them by adding one field. Then in the generated topojson dict, replace the single object by creating a dict based on the field you created.

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mattijn avatar mattijn commented on June 20, 2024

@natsuapo, simple but effective. Sounds like an idea worth trying!

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