Low-level wk filters and handlers

# S3 method for 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
)

# S3 method for 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.

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.