Convert arcs to WKT linestrings

Usage

arcs_to_wkb(x, quotient = FALSE, ...)

arcs_to_wkt(x, quotient = FALSE)

Arguments

x: A wkpool (ideally after merge_coincident)
quotient: Walk the quotient graph: duplicated shared boundaries collapse to a single undirected edge (first occurrence keeps its direction), so a boundary shared by two features becomes ONE arc rather than one per feature, and its interior vertices are degree-2 pass-throughs. This is the TopoJSON-style arc decomposition of a polygon layer. Default FALSE walks every segment.
...: Passed to wk::as_wkb()

Value

A wk_wkt vector of LINESTRING geometries

Details

Each arc (maximal segment sequence between nodes) becomes a linestring.

Geometry is assembled natively via wk::wk_linestring() (WKB first, WKT derived from it): coordinates are emitted at full double precision, 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)
arcs_to_wkt(merged)
#> <wk_wkt[4]>
#> [1] LINESTRING (1 0, 0 0, 0 1, 1 1) LINESTRING (1 0, 1 1)          
#> [3] LINESTRING (1 0, 2 0, 2 1, 1 1) LINESTRING (1 0, 1 1)