I have some simple polygons that I would like to convert to polylines using the sf package in R. I have found st_polygonize to convert polylines to polygons but I cannot but the reserve operation. Some documentation suggested that st_segmentize would work but I haven't found it useful.
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Hang on, do you want polygon to polyline or polyline to polygon? Your title says one, your first line says the other, then you say polylines to polygons...– SpacedmanSep 4, 2019 at 19:37
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I made a mistake in the title. Thanks for your answer to my question in the text! It's much simpler than I thought.– user3386170Sep 4, 2019 at 19:44
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1 Answer
To convert a simple polygon P (that defines an area) to a line L use:
L = st_cast(P,"LINESTRING")
eg using pl from example(st_polygon):
> st_polygon(pl)
POLYGON ((0 0, 1 0, 1 1, 0 1, 0 0))
> st_cast(st_polygon(pl),"LINESTRING")
LINESTRING (0 0, 1 0, 1 1, 0 1, 0 0)
answered Sep 4, 2019 at 19:30
