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Is that possible to keep entities who haven't join entities in Geopandas Spatial Join ?

In

join = gpd.sjoin(buf, grouped_aquis, op='contains')

I would like to keep buf's entities that haven't grouped_aquis' entities joined.

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By default sjoin does a 'inner' join, meaning that only those records are kept that actually joined with a record in grouped_aquis. To also keep the ones that did not have a joining match, you can use an 'left' join:

join = gpd.sjoin(buf, grouped_aquis, op='contains', how='left')
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