[R-sig-Geo] Sf find number of parts in multigeometry

[Martin Tomko]

I am looking for an equivalent to Postgis ST_NumGeometries https://postgis.net/docs/ST_NumGeometries.html
I have multipolygons in an sf df, where most of them are likely to be single part. I want to identify those that are not single part, and possibly retain only the largest polygon part, and cast all into Polygon.
Any advice is appreciated, thanks!

Martin


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