CRS and geodesic handling for wkpool — wkpool-crs • wkpool

A wkpool participates in wk's CRS propagation model: the CRS is an opaque object carried in an attribute, never interpreted, and checked for equality when pools are combined. Likewise the geodesic flag records whether segments should be interpreted as geodesics when coordinates are spherical. Both are captured from the input by establish_topology(), survive subsetting, merging and compaction, and are restored onto geometry produced by segments_to_wkt(), arcs_to_wkt(), cycles_to_wkt() and their WKB counterparts.

Usage

# S3 method for class 'wkpool'
wk_crs(x)

# S3 method for class 'wkpool'
wk_set_crs(x, crs)

# S3 method for class 'wkpool'
wk_is_geodesic(x)

# S3 method for class 'wkpool'
wk_set_geodesic(x, geodesic)

Arguments

x: A wkpool object.
crs: A CRS object (commonly an authority string such as "EPSG:4326"), or NULL.
geodesic: TRUE, FALSE, or NA (inherit).

Value

wk_crs(): the CRS object, or NULL.
wk_set_crs(), wk_set_geodesic(): x with the attribute replaced.
wk_is_geodesic(): TRUE, FALSE, or NA.

Examples

x <- wk::wkt("LINESTRING (0 0, 1 1)", crs = "EPSG:4326")
pool <- establish_topology(x)
wk::wk_crs(pool)
#> [1] "EPSG:4326"
wk::wk_crs(wk::wk_set_crs(pool, "EPSG:3031"))
#> [1] "EPSG:3031"