S2Polygon: Construct a S2Polygon
In spatstat/s2: Google's S2 Library for Geometry on the Sphere

This function builds an 'S2Polygon' using the C++ polygon builder. See the header file inst/include/s2/s2polygonbuilder.h for details on how to use the arguments.

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S2Polygon(x, validate = TRUE, xor_edges = TRUE,
  vertex_merge_radius = 0, edge_splice_fraction = 0.866,
  undirected_edges = FALSE)

`x`	Input to construct the polygon from. At the moment the only valid input is a list of loops.
`validate`	Logical to validate the S2Polygon. Default is 'TRUE'.
`xor_edges`	Logical to indicate that edges should be 'xor'ed to avoind multiple loops with common edges. Default is 'TRUE'.
`vertex_merge_radius`	Numeric indicating that vertices within this distance should be merged. Defaults to zero (i.e. no merging).
`edge_splice_fraction`	Determines when edges are spliced. See C++ header as indicated in the description of this function. Default is 0.866.
`undirected_edges`	Logical to indicate that input edges should be considered undirected. Default is 'FALSE'. multiple loops with common edges. Default is 'TRUE'.