wkutils: wkb_coords – R documentation

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wkb_coords

Extract coordinates from well-known geometries

These functions are optimised for graphics output, which in R require flat coordinate structures. See graphics::points(), graphics::lines(), and graphics::polypath() for how to send these to a graphics device, or grid::pointsGrob(), grid::linesGrob(), and grid::pathGrob() for how to create graphical objects using this output.

wkb_coords(wkb, sep_na = FALSE)

wkt_coords(wkt, sep_na = FALSE)

`wkb`	A `list()` of `raw()` vectors, such as that returned by `sf::st_as_binary()`.
`sep_na`	Use `TRUE` to separate geometries and linear rings with a row of `NA`s. This is useful for generating output that can be fed directly to `graphics::polypath()` or `graphics::lines()` without modification.
`wkt`	A character vector containing well-known text.

A data.frame with columns:

feature_id: The index of the top-level feature
part_id: The part identifier, guaranteed to be unique for every simple geometry (including those contained within a multi-geometry or collection)
ring_id: The ring identifier, guaranteed to be unique for every ring.
x, y, z, m: Coordinaate values (both absence and nan are recorded as NA)

text <- c("LINESTRING (0 1, 19 27)", "LINESTRING (-1 -1, 4 10)")
wkt_coords(text)
wkt_coords(text, sep_na = TRUE)

Utilities for Well-Known Geometry Vectors

v0.1.1

MIT + file LICENSE

Authors

Dewey Dunnington [aut, cre] (<https://orcid.org/0000-0002-9415-4582>)

Initial release