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Spatial lines in sf format for smoothing. There are examples of lines forming a closed loop and multipart lines.
jagged_lines
An sf object with 9 features and 3 attribute:
type: character; the geometry, i.e. "polygon" or "line".
type
closed: logical; whether the line forms a closed loop or not.
closed
multipart: logical; whether the feature is single or multipart.
multipart