Low-level wk filters and handlers

Usage

# S3 method for class 's2_geography'
wk_handle(
  handleable,
  handler,
  ...,
  s2_projection = s2_projection_plate_carree(),
  s2_tessellate_tol = Inf
)

s2_geography_writer(
  oriented = FALSE,
  check = TRUE,
  projection = s2_projection_plate_carree(),
  tessellate_tol = Inf,
  use_altrep = !isTRUE(getOption("s2.disable_altrep"))
)

# S3 method for class 's2_geography'
wk_writer(handleable, ...)

s2_trans_point()

s2_trans_lnglat()

s2_projection_plate_carree(x_scale = 180)

s2_projection_mercator(x_scale = 20037508.3427892)

s2_hemisphere(centre)

s2_world_plate_carree(epsilon_east_west = 0, epsilon_north_south = 0)

s2_projection_orthographic(centre = s2_lnglat(0, 0))

Arguments

handleable: A geometry vector (e.g., wkb(), wkt(), xy(), rct(), or sf::st_sfc()) for which wk_handle() is defined.
handler: A wk_handler object.
...: Passed to the wk_handle() method.
oriented: TRUE if polygon ring directions are known to be correct (i.e., exterior rings are defined counter clockwise and interior rings are defined clockwise).
check: Use check = FALSE to skip error on invalid geometries
projection, s2_projection: One of s2_projection_plate_carree() or s2_projection_mercator()
tessellate_tol, s2_tessellate_tol: An angle in radians. Points will not be added if a line segment is within this distance of a point.
use_altrep: A flag indicating whether ALTREP representation of s2 geography vectors should be used with support for data serialization (default: TRUE on R 4.3.0 and later, set the option s2.disable_altrep to disable)
x_scale: The maximum x value of the projection
centre: The center point of the orthographic projection
epsilon_east_west, epsilon_north_south: Use a positive number to define the edges of a Cartesian world slightly inward from -180, -90, 180, 90. This may be used to define a world outline for a projection where projecting at the extreme edges of the earth results in a non-finite value.

Value

s2_projection_plate_carree(), s2_projection_mercator(): An external pointer to an S2 projection.