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A couple of additional tools here:
explode() expands multi-part geometries into multiple rows, and into
their single part geometries. This returns a
GeoSeries
with aMultiIndex
.collect() - take multiple single geometries and combine them into their
Multi* counterparts.
explode()
is a new member ofGeoPandasBase
, but could also be a separate function intools
likecollect()
is. These are similar to PostGISST_Dump
andST_Collect
functions.To use
MultiIndex
you can use.loc
on the first level to get back:Using the NYC boros examples you can do some neat things quickly:
Take the polygon with the greatest area from each multipolygon, preserving the index:
Remove any polygons with small perimeters from each multipolygon, recombine to MultiPolygon: