Convert cycles to WKT polygons

Usage

cycles_to_wkt(x, feature = TRUE, convention = c("sf", "ogc"))

cycles_to_wkb(x, feature = TRUE, convention = c("sf", "ogc"), ...)

Arguments

x: A wkpool (ideally after merge_coincident)
feature: Logical: attempt to reconstruct original features? If TRUE, groups cycles by .feature and nests holes in outers. If FALSE, each cycle becomes a separate polygon.
convention: Winding convention: "sf" (default) or "ogc"; only consulted for pools without path provenance
...: Passed to wk::as_wkb()

Value

A wk_wkt vector of POLYGON geometries

Details

Converts cycles back to polygons. When feature = TRUE and the pool carries path provenance (minted by establish_topology()), the original feature structure is reconstructed exactly: rings are grouped into their original part (exterior first, then that part's holes) and parts into their original feature (POLYGON or MULTIPOLYGON), with winding emitted as stored and convention not consulted. Pools without provenance fall back to a heuristic that groups rings by feature and nests all holes with the first outer.

Geometry is assembled natively via wk::wk_polygon() and wk::wk_collection() (WKB first, WKT derived from it): coordinates are emitted at full double precision, rings are closed by wk, z is carried when the pool has it, and the pool's crs and geodesic flag are attached to the output.

Examples

x <- wk::as_wkb(c(
  "POLYGON ((0 0, 1 0, 1 1, 0 1, 0 0))",
  "POLYGON ((1 0, 2 0, 2 1, 1 1, 1 0))"
))
pool <- establish_topology(x)
merged <- merge_coincident(pool)
cycles_to_wkt(merged)
#> <wk_wkt[2]>
#> [1] POLYGON ((0 0, 1 0, 1 1, 0 1, 0 0)) POLYGON ((1 0, 2 0, 2 1, 1 1, 1 0))