I aim to calculate the concave Hull from all the points of my database.

I'm trying to extract the vertices: -of a SpPolygonsDataFrame -of a SpLinesDataFrame both are imported by readOGR()

I tried different methods but I'm only extracting centroids.

poly<- readOGR(".", "sample")
coordinates(as(as(poly, "SpatialLines"), "SpatialPoints"))

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