How can I make several polygons with alphaShape from a shapefile that contains multiple line objects?
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I downloaded a shapefile with the coastline of New Zealand. I would like to check several coordinates to see if they are within the land of New Zealand. (I found out that I should use the inShape function.) Since the shapefile contains several islands/polygons, when I use alphaShape it makes one huge polygon which is a mess. How can I separate the different islands/polygons? Thank you for your help and answers!
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