Spatial polygons in sf format for smoothing. Most of these polygons have been created by converting rasters to polygons and therefore consist entirely of right angles. There are examples of polygons with holes and multipart polygons.
jagged_polygonsAn sf object with 9 features and 3 attribute:
type: character; the geometry, i.e. "polygon" or "line".
hole: logical; whether the polygon has holes or not.
multipart: logical; whether the feature is single or multipart.