st_force_polygon_cw | R Documentation |
Check if a POLYGON or MULTIPOLYGON is clockwise, and if not make it so. According to the 'Right-hand-rule', outer rings should be clockwise, and inner holes should be counter-clockwise
st_force_polygon_cw(x)
x |
object with polygon geometries |
object of the same class as x
library(sf)
polys <- st_sf(cw = c(FALSE, TRUE),
st_as_sfc(c('POLYGON ((0 0, 1 0, 1 1, 0 0))',
'POLYGON ((1 1, 2 2, 2 1, 1 1))')))
st_force_polygon_cw(polys)
st_force_polygon_cw(st_geometry(polys))
st_force_polygon_cw(st_geometry(polys)[[1]])
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