Package 'wk'

Title: Lightweight Well-Known Geometry Parsing
Description: Provides a minimal R and C++ API for parsing well-known binary and well-known text representation of geometries to and from R-native formats. Well-known binary is compact and fast to parse; well-known text is human-readable and is useful for writing tests. These formats are useful in R only if the information they contain can be accessed in R, for which high-performance functions are provided here.
Authors: Dewey Dunnington [aut, cre] , Edzer Pebesma [aut] , Anthony North [ctb]
Maintainer: Dewey Dunnington <[email protected]>
License: MIT + file LICENSE
Version: 0.9.3.9000
Built: 2024-11-10 03:29:04 UTC
Source: https://github.com/paleolimbot/wk

Help Index

2D Circle Vectors

Description

2D Circle Vectors

Usage

crc(x = double(), y = double(), r = double(), crs = wk_crs_auto())

as_crc(x, ...)

## S3 method for class 'wk_crc'
as_crc(x, ...)

## S3 method for class 'matrix'
as_crc(x, ..., crs = NULL)

## S3 method for class 'data.frame'
as_crc(x, ..., crs = NULL)

Arguments

x, y

Coordinates of the center
r

Circle radius
crs

A value to be propagated as the CRS for this vector.
...

Extra arguments passed to as_crc().

Value

A vector along the recycled length of bounds.

Examples

crc(1, 2, 3)

Circle accessors

Description

Circle accessors

Usage

crc_x(x)

crc_y(x)

crc_center(x)

crc_r(x)

Arguments

x

A crc() vector

Value

Components of the crc() vector

Examples

x <- crc(1, 2, r = 3)
crc_x(x)
crc_y(x)
crc_r(x)
crc_center(x)

Raster-like objects

Description

grd() objects are just an array (any object with more than two dim()s) and a bounding box (a rct(), which may or may not have a wk_crs() attached). The ordering of the dimensions is y (indices increasing downwards), x (indices increasing to the right). This follows the ordering of as.raster()/rasterImage() and aligns with the printing of matrices.

Usage

grd(
  bbox = NULL,
  nx = NULL,
  ny = NULL,
  dx = NULL,
  dy = NULL,
  type = c("polygons", "corners", "centers")
)

grd_rct(data, bbox = rct(0, 0, dim(data)[2], dim(data)[1]))

grd_xy(data, bbox = rct(0, 0, dim(data)[2] - 1, dim(data)[1] - 1))

as_grd_rct(x, ...)

## S3 method for class 'wk_grd_rct'
as_grd_rct(x, ...)

## S3 method for class 'wk_grd_xy'
as_grd_rct(x, ...)

as_grd_xy(x, ...)

## S3 method for class 'wk_grd_xy'
as_grd_xy(x, ...)

## S3 method for class 'wk_grd_rct'
as_grd_xy(x, ...)

Arguments

bbox

A rct() containing the bounds and CRS of the object. You can specify a rct() with xmin > xmax or ymin > ymax which will flip the underlying data and return an object with a normalized bounding box and data.
nx, ny, dx, dy

Either a number of cells in the x- and y- directions or delta in the x- and y-directions (in which case bbox must be specified).
type

Use "polygons" to return a grid whose objects can be represented using an rct(); use "centers" to return a grid whose objects are the center of the rct() grid; use "corners" to return a grid along the corners of bbox.
data

An object with two or more dimensions. Most usefully, a matrix.
x

An object to convert to a grid
...

Passed to S3 methods

Value

  • grd() returns a grd_rct() for ⁠type == "polygons⁠ or a grd_xy() otherwise.

  • grd_rct() returns an object of class "wk_grd_rct".

  • grd_xy() returns an object of class "wk_grd_xy".

Examples

# create a grid with no data (just for coordinates)
(grid <- grd(nx = 2, ny = 2))
as_rct(grid)
as_xy(grid)
plot(grid, border = "black")

# more usefully, wraps a matrix or nd array + bbox
# approx volcano in New Zealand Transverse Mercator
bbox <- rct(
  5917000,       1757000 + 870,
  5917000 + 610, 1757000,
  crs = "EPSG:2193"
)
(grid <- grd_rct(volcano, bbox))

# these come with a reasonable default plot method for matrix data
plot(grid)

# you can set the data or the bounding box after creation
grid$bbox <- rct(0, 0, 1, 1)

# subset by indices or rct
plot(grid[1:2, 1:2])
plot(grid[c(start = NA, stop = NA, step = 2), c(start = NA, stop = NA, step = 2)])
plot(grid[rct(0, 0, 0.5, 0.5)])

Grid cell operators

Description

Grid cell operators

Usage

grd_cell(grid, point, ..., snap = grd_snap_next)

grd_cell_range(
  grid,
  bbox = wk_bbox(grid),
  ...,
  step = 1L,
  snap = grd_snap_next
)

grd_cell_rct(grid, i, j = NULL, ...)

## S3 method for class 'wk_grd_rct'
grd_cell_rct(grid, i, j = NULL, ..., out_of_bounds = "keep")

## S3 method for class 'wk_grd_xy'
grd_cell_rct(grid, i, j = NULL, ..., out_of_bounds = "keep")

grd_cell_xy(grid, i, j = NULL, ...)

## S3 method for class 'wk_grd_rct'
grd_cell_xy(grid, i, j = NULL, ..., out_of_bounds = "keep")

## S3 method for class 'wk_grd_xy'
grd_cell_xy(grid, i, j = NULL, ..., out_of_bounds = "keep")

Arguments

grid

A grd_xy(), grd_rct(), or other object implementing ⁠grd_*()⁠ methods.
point

A handleable of points.
...

Unused
snap

A function that transforms real-valued indices to integer indices (e.g., floor(), ceiling(), or round()). For grd_cell_range(), a list() with exactly two elements to be called for the minimum and maximum index values, respectively.
bbox

An rct() object.
step

The difference between adjascent indices in the output
i, j

1-based index values. i indices correspond to decreasing y values; j indices correspond to increasing x values. Values outside the range 1:nrow|ncol(data) will be censored to NA including 0 and negative values.
out_of_bounds

One of 'keep', 'censor', 'discard', or 'squish'

Value

  • grd_cell(): returns a list(i, j) of index values corresponding to the input points and adjusted according to snap. Index values will be outside dim(grid) for points outside wk_bbox(grid) including negative values.

  • grd_cell_range() returns a slice describing the range of indices in the i and j directions.

  • grd_cell_rct() returns a rct() of the cell extent at ⁠i, j⁠.

  • grd_cell_xy() returns a xy() of the cell center at ⁠i, j⁠.

Examples

grid <- grd(nx = 3, ny = 2)
grd_cell(grid, xy(0.5, 0.5))
grd_cell_range(grid, grid$bbox)
grd_cell_rct(grid, 1, 1)
grd_cell_xy(grid, 1, 1)

Extract values from a grid

Description

Unlike grd_subset(), which subsets like a matrix, grd_extract() returns values.

Usage

grd_extract(grid, i = NULL, j = NULL)

grd_extract_nearest(grid, point, out_of_bounds = c("censor", "squish"))

grd_data_extract(grid_data, i = NULL, j = NULL)

Arguments

grid

A grd_xy(), grd_rct(), or other object implementing ⁠grd_*()⁠ methods.
i, j

Index values as in grd_subset() except recycled to a common size.
point

A handleable of points.
out_of_bounds

One of 'keep', 'censor', 'discard', or 'squish'
grid_data

The data member of a grd(). This is typically an array but can also be an S3 object with an array-like subset method. The native raster is special-cased as its subset method requires non-standard handling.

Value

A matrix or vector with two fewer dimensions than the input.

Index snap functions

Description

These functions can be used in grd_cell() and grd_cell_range(). These functions differ in the way they round 0.5: grd_snap_next() always rounds up and grd_snap_previous() always rounds down. You can also use floor() and ceiling() as index snap functions.

Usage

grd_snap_next(x)

grd_snap_previous(x)

Arguments

x

A vector of rescaled but non-integer indices

Value

A vector of integer indices

Examples

grd_snap_next(seq(0, 2, 0.25))
grd_snap_previous(seq(0, 2, 0.25))

Subset grid objects

Description

The grd_subset() method handles the subsetting of a grd() in x-y space. Ordering of indices is not considered and logical indies are recycled silently along dimensions. The result of a grd_subset() is always a grd() of the same type whose relationship to x-y space has not changed.

Usage

grd_subset(grid, i = NULL, j = NULL, ...)

grd_crop(grid, bbox, ..., step = 1L, snap = NULL)

grd_extend(grid, bbox, ..., step = 1L, snap = NULL)

## S3 method for class 'wk_grd_rct'
grd_crop(grid, bbox, ..., step = 1L, snap = NULL)

## S3 method for class 'wk_grd_xy'
grd_crop(grid, bbox, ..., step = 1L, snap = NULL)

## S3 method for class 'wk_grd_rct'
grd_extend(grid, bbox, ..., step = 1L, snap = NULL)

## S3 method for class 'wk_grd_xy'
grd_extend(grid, bbox, ..., step = 1L, snap = NULL)

grd_data_subset(grid_data, i = NULL, j = NULL)

Arguments

grid

A grd_xy(), grd_rct(), or other object implementing ⁠grd_*()⁠ methods.
i, j

1-based index values. i indices correspond to decreasing y values; j indices correspond to increasing x values. Values outside the range 1:nrow|ncol(data) will be censored to NA including 0 and negative values.
...

Passed to subset methods
bbox

An rct() object.
step

The difference between adjascent indices in the output
snap

A function that transforms real-valued indices to integer indices (e.g., floor(), ceiling(), or round()). For grd_cell_range(), a list() with exactly two elements to be called for the minimum and maximum index values, respectively.
grid_data

The data member of a grd(). This is typically an array but can also be an S3 object with an array-like subset method. The native raster is special-cased as its subset method requires non-standard handling.

Value

A modified grid whose cell centres have not changed location as a result of the subset.

Examples

grid <- grd_rct(volcano)
grd_subset(grid, 1:20, 1:30)
grd_crop(grid, rct(-10, -10, 10, 10))
grd_extend(grid, rct(-10, -10, 10, 10))

Grid information

Description

Grid information

Usage

grd_summary(grid)

Arguments

grid

A grd_xy(), grd_rct(), or other object implementing ⁠grd_*()⁠ methods.

Value

  • grd_summary() returns a list() with components xmin, ymin, xmax, ymax, nx, ny, dx, dy, width, and height.

Examples

grd_summary(grd(nx = 3, ny = 2))

Extract normalized grid tiles

Description

Unlike grd_tile_template(), which returns a grd() whose elements are the boundaries of the specified tiles with no data attached, grd_tile() returns the actual tile with the data.

Usage

grd_tile(grid, level, i, j = NULL)

## S3 method for class 'wk_grd_rct'
grd_tile(grid, level, i, j = NULL)

## S3 method for class 'wk_grd_xy'
grd_tile(grid, level, i, j = NULL)

Arguments

grid

A grd_xy(), grd_rct(), or other object implementing ⁠grd_*()⁠ methods.
level

An integer describing the overview level. This is related to the step value by a power of 2 (i.e., a level of 1 indicates a step of 2, a level of 2 indicates a step of 4, etc.).
i, j

1-based index values. i indices correspond to decreasing y values; j indices correspond to increasing x values. Values outside the range 1:nrow|ncol(data) will be censored to NA including 0 and negative values.

Value

A grd_subset()ed version

Examples

grid <- grd_rct(volcano)
plot(grd_tile(grid, 4, 1, 1))

plot(grd_tile(grid, 3, 1, 1), add = TRUE)
plot(grd_tile(grid, 3, 1, 2), add = TRUE)
plot(grd_tile(grid, 3, 2, 1), add = TRUE)
plot(grd_tile(grid, 3, 2, 2), add = TRUE)

grid <- as_grd_xy(grd_tile(grid, 4, 1, 1))
plot(grid, add = TRUE, pch = ".")
plot(grd_tile(grid, 3, 1, 1), add = TRUE, col = "green", pch = ".")
plot(grd_tile(grid, 3, 1, 2), add = TRUE, col = "red", pch = ".")
plot(grd_tile(grid, 3, 2, 1), add = TRUE, col = "blue", pch = ".")
plot(grd_tile(grid, 3, 2, 2), add = TRUE, col = "magenta", pch = ".")

Compute overview grid tile

Description

A useful workflow for raster data in a memory bounded environment is to chunk a grid into sections or tiles. These functions compute tiles suitable for such processing. Use grd_tile_summary() to generate statistics for level values to choose for your application.

Usage

grd_tile_template(grid, level)

grd_tile_summary(grid, levels = NULL)

Arguments

grid

A grd_xy(), grd_rct(), or other object implementing ⁠grd_*()⁠ methods.
level

An integer describing the overview level. This is related to the step value by a power of 2 (i.e., a level of 1 indicates a step of 2, a level of 2 indicates a step of 4, etc.).
levels

A vector of level values or NULL to use a sequence from 0 to the level that would result in a 1 x 1 grid.

Value

A grd()

Examples

grid <- grd_rct(volcano)
grd_tile_summary(grid)
grd_tile_template(grid, 3)

Test handlers for handling of unknown size vectors

Description

Test handlers for handling of unknown size vectors

Usage

handle_wkt_without_vector_size(handleable, handler)

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.

Examples

handle_wkt_without_vector_size(wkt(), wk_vector_meta_handler())

S3 details for crc objects

Description

S3 details for crc objects

Usage

new_wk_crc(x = list(x = double(), y = double(), r = double()), crs = NULL)

Arguments

x

A crc()
crs

A value to be propagated as the CRS for this vector.

S3 details for grid objects

Description

S3 details for grid objects

Usage

new_wk_grd(x, subclass = character())

Arguments

x

A grd()
subclass

An optional subclass.

Value

An object inheriting from 'grd'

S3 details for rct objects

Description

S3 details for rct objects

Usage

new_wk_rct(
  x = list(xmin = double(), ymin = double(), xmax = double(), ymax = double()),
  crs = NULL
)

Arguments

x

A rct()
crs

A value to be propagated as the CRS for this vector.

S3 Details for wk_wkb

Description

S3 Details for wk_wkb

Usage

new_wk_wkb(x = list(), crs = NULL, geodesic = NULL)

validate_wk_wkb(x)

is_wk_wkb(x)

Arguments

x

A (possibly) wkb() vector
crs

A value to be propagated as the CRS for this vector.
geodesic

TRUE if edges must be interpolated as geodesics when coordinates are spherical, FALSE otherwise.

S3 Details for wk_wkt

Description

S3 Details for wk_wkt

Usage

new_wk_wkt(x = character(), crs = NULL, geodesic = NULL)

is_wk_wkt(x)

validate_wk_wkt(x)

Arguments

x

A (possibly) wkt() vector
crs

A value to be propagated as the CRS for this vector.
geodesic

TRUE if edges must be interpolated as geodesics when coordinates are spherical, FALSE otherwise.

S3 details for xy objects

Description

S3 details for xy objects

Usage

new_wk_xy(x = list(x = double(), y = double()), crs = NULL)

new_wk_xyz(x = list(x = double(), y = double(), z = double()), crs = NULL)

new_wk_xym(x = list(x = double(), y = double(), m = double()), crs = NULL)

new_wk_xyzm(
  x = list(x = double(), y = double(), z = double(), m = double()),
  crs = NULL
)

validate_wk_xy(x)

validate_wk_xyz(x)

validate_wk_xym(x)

validate_wk_xyzm(x)

Arguments

x

A xy() object.
crs

A value to be propagated as the CRS for this vector.

Plot grid objects

Description

Plot grid objects

Usage

## S3 method for class 'wk_grd_xy'
plot(x, ...)

## S3 method for class 'wk_grd_rct'
plot(
  x,
  ...,
  image = NULL,
  interpolate = FALSE,
  oversample = 4,
  border = NA,
  asp = 1,
  bbox = NULL,
  xlab = "",
  ylab = "",
  add = FALSE
)

Arguments

x

A wkb() or wkt()
...

Passed to plotting functions for features: graphics::points() for point and multipoint geometries, graphics::lines() for linestring and multilinestring geometries, and graphics::polypath() for polygon and multipolygon geometries.
image

A raster or nativeRaster to pass to graphics::rasterImage(). use NULL to do a quick-and-dirty rescale of the data such that the low value is black and the high value is white.
interpolate

Use TRUE to perform interpolation between color values.
oversample

A scale on the number of pixels on the device to use for sampling estimation of large raster values. Use Inf to disable.
border

Color to use for polygon borders. Use NULL for the default and NA to skip plotting borders.
asp, xlab, ylab

Passed to graphics::plot()
bbox

The limits of the plot as a rct() or compatible object
add

Should a new plot be created, or should handleable be added to the existing plot?

Value

x, invisibly.

Examples

plot(grd_rct(volcano))
plot(grd_xy(volcano))

2D rectangle vectors

Description

2D rectangle vectors

Usage

rct(
  xmin = double(),
  ymin = double(),
  xmax = double(),
  ymax = double(),
  crs = wk_crs_auto()
)

as_rct(x, ...)

## S3 method for class 'wk_rct'
as_rct(x, ...)

## S3 method for class 'matrix'
as_rct(x, ..., crs = NULL)

## S3 method for class 'data.frame'
as_rct(x, ..., crs = NULL)

Arguments

xmin, ymin, xmax, ymax

Rectangle bounds.
crs

A value to be propagated as the CRS for this vector.
x

An object to be converted to a rct().
...

Extra arguments passed to as_rct().

Value

A vector along the recycled length of bounds.

Examples

rct(1, 2, 3, 4)

Rectangle accessors and operators

Description

Rectangle accessors and operators

Usage

rct_xmin(x)

rct_ymin(x)

rct_xmax(x)

rct_ymax(x)

rct_width(x)

rct_height(x)

rct_intersects(x, y)

rct_contains(x, y)

rct_intersection(x, y)

Arguments

x, y

rct() vectors

Value

  • rct_xmin(), rct_xmax(), rct_ymin(), and rct_ymax() return the components of the rct().

Examples

x <- rct(0, 0, 10, 10)
y <- rct(5, 5, 15, 15)

rct_xmin(x)
rct_ymin(x)
rct_xmax(x)
rct_ymax(x)
rct_height(x)
rct_width(x)
rct_intersects(x, y)
rct_intersection(x, y)
rct_contains(x, y)
rct_contains(x, rct(4, 4, 6, 6))

Vctrs methods

Description

Vctrs methods

Usage

vec_cast.wk_wkb(x, to, ...)

vec_ptype2.wk_wkb(x, y, ...)

vec_cast.wk_wkt(x, to, ...)

vec_ptype2.wk_wkt(x, y, ...)

vec_cast.wk_xy(x, to, ...)

vec_ptype2.wk_xy(x, y, ...)

vec_cast.wk_xyz(x, to, ...)

vec_ptype2.wk_xyz(x, y, ...)

vec_cast.wk_xym(x, to, ...)

vec_ptype2.wk_xym(x, y, ...)

vec_cast.wk_xyzm(x, to, ...)

vec_ptype2.wk_xyzm(x, y, ...)

vec_cast.wk_rct(x, to, ...)

vec_ptype2.wk_rct(x, y, ...)

vec_cast.wk_crc(x, to, ...)

vec_ptype2.wk_crc(x, y, ...)

Arguments

x, y, to, ...

See vctrs::vec_cast() and vctrs::vec_ptype2().

2D bounding rectangles

Description

2D bounding rectangles

Usage

wk_bbox(handleable, ...)

wk_envelope(handleable, ...)

## Default S3 method:
wk_bbox(handleable, ...)

## Default S3 method:
wk_envelope(handleable, ...)

## S3 method for class 'wk_rct'
wk_envelope(handleable, ...)

## S3 method for class 'wk_crc'
wk_envelope(handleable, ...)

## S3 method for class 'wk_xy'
wk_envelope(handleable, ...)

wk_bbox_handler()

wk_envelope_handler()

Arguments

handleable

A geometry vector (e.g., wkb(), wkt(), xy(), rct(), or sf::st_sfc()) for which wk_handle() is defined.
...

Passed to the wk_handle() method.

Value

A rct() of length 1.

Examples

wk_bbox(wkt("LINESTRING (1 2, 3 5)"))

Chunking strategies

Description

It is often impractical, inefficient, or impossible to perform an operation on a vector of geometries with all the geometries loaded into memory at the same time. These functions help generalize the pattern of split-apply-combine to one or more handlers recycled along a common length. These functions are designed for developers rather than users and should be considered experimental.

Usage

wk_chunk_strategy_single()

wk_chunk_strategy_feature(n_chunks = NULL, chunk_size = NULL)

wk_chunk_strategy_coordinates(n_chunks = NULL, chunk_size = NULL, reduce = "*")

Arguments

n_chunks, chunk_size

Exactly one of the number of chunks or the chunk size. For wk_chunk_strategy_feature() the chunk size refers to the number of features; for wk_chunk_strategy_coordinates() this refers to the number of coordinates as calculated from multiple handleables using reduce.
reduce

For wk_chunk_strategy_coordinates() this refers to the function used with Reduce() to combine coordinate counts from more than one handleable.

Value

A function that returns a data.frame with columns from and to when called with a handleable and the feature count.

Examples

feat <- c(as_wkt(xy(1:4, 1:4)), wkt("LINESTRING (1 1, 2 2)"))
wk_chunk_strategy_single()(list(feat), 5)
wk_chunk_strategy_feature(chunk_size = 2)(list(feat), 5)
wk_chunk_strategy_coordinates(chunk_size = 2)(list(feat), 5)

Count geometry components

Description

Counts the number of geometries, rings, and coordinates found within each feature. As opposed to wk_meta(), this handler will iterate over the entire geometry.

Usage

wk_count(handleable, ...)

## Default S3 method:
wk_count(handleable, ...)

wk_count_handler()

Arguments

handleable

A geometry vector (e.g., wkb(), wkt(), xy(), rct(), or sf::st_sfc()) for which wk_handle() is defined.
...

Passed to the wk_handle() method.

Value

A data.frame with one row for every feature encountered and columns:

  • n_geom: The number of geometries encountered, including the root geometry. Will be zero for a null feature.

  • n_ring: The number of rings encountered. Will be zero for a null feature.

  • n_coord: The number of coordinates encountered. Will be zero for a null feature.

Examples

wk_count(as_wkt("LINESTRING (0 0, 1 1)"))
wk_count(as_wkb("LINESTRING (0 0, 1 1)"))

Set and get vector CRS

Description

The wk package doesn't operate on CRS objects, but does propagate them through subsetting and concatenation. A CRS object can be any R object, and x can be any object whose 'crs' attribute carries a CRS. These functions are S3 generics to keep them from being used on objects that do not use this system of CRS propagation.

Usage

wk_crs(x)

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

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

wk_crs(x) <- value

wk_set_crs(x, crs)

wk_crs_output(...)

wk_is_geodesic_output(...)

Arguments

x, ...

Objects whose "crs" attribute is used to carry a CRS.
value

See crs.
crs

An object that can be interpreted as a CRS

Compare CRS objects

Description

The wk_crs_equal() function uses special S3 dispatch on wk_crs_equal_generic() to evaluate whether or not two CRS values can be considered equal. When implementing wk_crs_equal_generic(), every attempt should be made to make wk_crs_equal(x, y) and wk_crs_equal(y, x) return identically.

Usage

wk_crs_equal(x, y)

wk_crs_equal_generic(x, y, ...)

Arguments

x, y

Objects stored in the crs attribute of a vector.
...

Unused

Value

TRUE if x and y can be considered equal, FALSE otherwise.

Special CRS values

Description

The CRS handling in the wk package requires two sentinel CRS values. The first, wk_crs_inherit(), signals that the vector should inherit a CRS of another vector if combined. This is useful for empty, NULL, and/or zero-length geometries. The second, wk_crs_auto(), is used as the default argument of crs for constructors so that zero-length geometries are assigned a CRS of wk_crs_inherit() by default.

Usage

wk_crs_inherit()

wk_crs_longlat(crs = NULL)

wk_crs_auto()

wk_crs_auto_value(x, crs)

Arguments

crs

A value for the coordinate reference system supplied by the user.
x

A raw input to a construuctor whose length and crs attributte is used to determine the default CRS returned by wk_crs_auto().

Examples

wk_crs_auto_value(list(), wk_crs_auto())
wk_crs_auto_value(list(), 1234)
wk_crs_auto_value(list(NULL), wk_crs_auto())

CRS object generic methods

Description

CRS object generic methods

Usage

wk_crs_proj_definition(crs, proj_version = NULL, verbose = FALSE)

wk_crs_projjson(crs)

## S3 method for class ''NULL''
wk_crs_proj_definition(crs, proj_version = NULL, verbose = FALSE)

## S3 method for class 'wk_crs_inherit'
wk_crs_proj_definition(crs, proj_version = NULL, verbose = FALSE)

## S3 method for class 'character'
wk_crs_proj_definition(crs, proj_version = NULL, verbose = FALSE)

## S3 method for class 'double'
wk_crs_proj_definition(crs, proj_version = NULL, verbose = FALSE)

## S3 method for class 'integer'
wk_crs_proj_definition(crs, proj_version = NULL, verbose = FALSE)

Arguments

crs

An arbitrary R object
proj_version

A package_version() of the PROJ version, or NULL if the PROJ version is unknown.
verbose

Use TRUE to request a more verbose version of the PROJ definition (e.g., PROJJSON). The default of FALSE should return the most compact version that completely describes the CRS. An authority:code string (e.g., "OGC:CRS84") is the recommended way to represent a CRS when verbose is FALSE, if possible, falling back to the most recent version of WKT2 or PROJJSON.

Value

  • wk_crs_proj_definition() Returns a string used to represent the CRS in PROJ. For recent PROJ version you'll want to return PROJJSON; however you should check proj_version if you want this to work with older versions of PROJ.

  • wk_crs_projjson() Returns a PROJJSON string or NA_character_ if this representation is unknown or can't be calculated.

Examples

wk_crs_proj_definition("EPSG:4326")

Debug filters and handlers

Description

Debug filters and handlers

Usage

wk_debug(handleable, handler = wk_void_handler(), ...)

wk_debug_filter(handler = wk_void_handler())

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.

Value

The result of the handler.

Examples

wk_debug(wkt("POINT (1 1)"))
wk_handle(wkt("POINT (1 1)"), wk_debug_filter())

Create example geometry objects

Description

Create example geometry objects

Usage

wk_example(which = "nc", crs = NA, geodesic = FALSE)

wk_example_wkt

Arguments

which

An example name. Valid example names are

  • "nc" (data derived from the sf package)

  • "point", "linestring", "polygon", "multipoint", "multilinestring", "multipolygon", "geometrycollection"

  • One of the above with the "_z", "_m", or "_zm" suffix.

crs

An object that can be interpreted as a CRS
geodesic

TRUE if edges must be interpolated as geodesics when coordinates are spherical, FALSE otherwise.

Format

An object of class list of length 29.

Value

A wkt() with the specified example.

Examples

wk_example("polygon")

Extract simple geometries

Description

Extract simple geometries

Usage

wk_flatten(handleable, ..., max_depth = 1)

wk_flatten_filter(handler, max_depth = 1L, add_details = FALSE)

Arguments

handleable

A geometry vector (e.g., wkb(), wkt(), xy(), rct(), or sf::st_sfc()) for which wk_handle() is defined.
...

Passed to the wk_handle() method.
max_depth

The maximum (outer) depth to remove.
handler

A wk_handler object.
add_details

Use TRUE to add a "wk_details" attribute, which contains columns feature_id, part_id, and ring_id.

Value

handleable transformed such that collections have been expanded and only simple geometries (point, linestring, polygon) remain.

Examples

wk_flatten(wkt("MULTIPOINT (1 1, 2 2, 3 3)"))
wk_flatten(
  wkt("GEOMETRYCOLLECTION (GEOMETRYCOLLECTION (GEOMETRYCOLLECTION (POINT (0 1))))"),
  max_depth = 2
)

Format well-known geometry for printing

Description

Provides an abbreviated version of the well-known text representation of a geometry. This returns a constant number of coordinates for each geometry, so is safe to use for geometry vectors with many (potentially large) features. Parse errors are passed on to the format string and do not cause this handler to error.

Usage

wk_format(handleable, precision = 7, trim = TRUE, max_coords = 6, ...)

wkt_format_handler(precision = 7, trim = TRUE, max_coords = 6)

Arguments

handleable

A geometry vector (e.g., wkb(), wkt(), xy(), rct(), or sf::st_sfc()) for which wk_handle() is defined.
precision

If trim is TRUE, the total number of significant digits to keep for each result or the number of digits after the decimal place otherwise.
trim

Use FALSE to keep trailing zeroes after the decimal place.
max_coords

The maximum number of coordinates to include in the output.
...

Passed to the wk_handle() method.

Value

A character vector of abbreviated well-known text.

Examples

wk_format(wkt("MULTIPOLYGON (((0 0, 10 0, 0 10, 0 0)))"))
wk_format(new_wk_wkt("POINT ENTPY"))
wk_handle(
  wkt("MULTIPOLYGON (((0 0, 10 0, 0 10, 0 0)))"),
  wkt_format_handler()
)

Handle specific regions of objects

Description

Handle specific regions of objects

Usage

## S3 method for class 'data.frame'
wk_handle_slice(handleable, handler, from = NULL, to = NULL, ...)

wk_handle_slice(
  handleable,
  handler = wk_writer(handleable),
  from = NULL,
  to = NULL,
  ...
)

## Default S3 method:
wk_handle_slice(
  handleable,
  handler = wk_writer(handleable),
  from = NULL,
  to = NULL,
  ...
)

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.
from

1-based index of the feature to start from
to

1-based index of the feature to end at
...

Passed to the wk_handle() method.

Value

A subset of handleable

Examples

wk_handle_slice(xy(1:5, 1:5), wkt_writer(), from = 3, to = 5)
wk_handle_slice(
  data.frame(let = letters[1:5], geom = xy(1:5, 1:5)),
  wkt_writer(),
  from = 3, to = 5
)

Use data.frame with wk

Description

Use data.frame with wk

Usage

## S3 method for class 'data.frame'
wk_handle(handleable, handler, ...)

## S3 method for class 'data.frame'
wk_restore(handleable, result, ...)

## S3 method for class 'tbl_df'
wk_restore(handleable, result, ...)

## S3 method for class 'data.frame'
wk_translate(handleable, to, ...)

## S3 method for class 'tbl_df'
wk_translate(handleable, to, ...)

## S3 method for class 'sf'
wk_translate(handleable, to, ...)

## S3 method for class 'sf'
wk_restore(handleable, result, ...)

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.
result

The result of a filter operation intended to be a transformation.
to

A prototype object.

Examples

wk_handle(data.frame(a = wkt("POINT (0 1)")), wkb_writer())
wk_translate(wkt("POINT (0 1)"), data.frame(col_name = wkb()))
wk_translate(data.frame(a = wkt("POINT (0 1)")), data.frame(wkb()))

Read geometry vectors

Description

The handler is the basic building block of the wk package. In particular, the wk_handle() generic allows operations written as handlers to "just work" with many different input types. The wk package provides the wk_void() handler, the wk_format() handler, the wk_debug() handler, the wk_problems() handler, and wk_writer()s for wkb(), wkt(), xy(), and sf::st_sfc()) vectors.

Usage

## S3 method for class 'wk_crc'
wk_handle(
  handleable,
  handler,
  ...,
  n_segments = getOption("wk.crc_n_segments", NULL),
  resolution = getOption("wk.crc_resolution", NULL)
)

## S3 method for class 'wk_rct'
wk_handle(handleable, handler, ...)

## S3 method for class 'sfc'
wk_handle(handleable, handler, ...)

## S3 method for class 'wk_wkb'
wk_handle(handleable, handler, ...)

## S3 method for class 'wk_wkt'
wk_handle(handleable, handler, ...)

## S3 method for class 'wk_xy'
wk_handle(handleable, handler, ...)

wk_handle(handleable, handler, ...)

is_handleable(handleable)

new_wk_handler(handler_ptr, subclass = character())

is_wk_handler(handler)

as_wk_handler(handler, ...)

## S3 method for class 'sfg'
wk_handle(handleable, handler, ...)

## S3 method for class 'sf'
wk_handle(handleable, handler, ...)

## S3 method for class 'bbox'
wk_handle(handleable, handler, ...)

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.
n_segments, resolution

The number of segments to use when approximating a circle. The default uses getOption("wk.crc_n_segments") so that this value can be set for implicit conversions (e.g., as_wkb()). Alternatively, set the minimum distance between points on the circle (used to estimate n_segments). The default is obtained using getOption("wk.crc_resolution").
handler_ptr

An external pointer to a newly created WK handler
subclass

The handler subclass

Value

A WK handler.

Handler interface for grid objects

Description

Handler interface for grid objects

Usage

## S3 method for class 'wk_grd_xy'
wk_handle(handleable, handler, ..., data_order = c("y", "x"))

## S3 method for class 'wk_grd_rct'
wk_handle(handleable, handler, ..., data_order = c("y", "x"))

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.
data_order

A vector of length 2 describing the order in which values should appear. The default, c("y", "x"), will output values in the same order as the default matrix storage in R (column-major). You can prefix a dimension with - to reverse the order of a dimension (e.g., c("-y", "x")).

Value

The result of the handler.

Examples

wk_handle(grd(nx = 3, ny = 3), wkt_writer())
wk_handle(grd(nx = 3, ny = 3, type = "centers"), wkt_writer())

Copy a geometry vector

Description

Copy a geometry vector

Usage

wk_identity(handleable, ...)

wk_identity_filter(handler)

wk_restore(handleable, result, ...)

## Default S3 method:
wk_restore(handleable, result, ...)

Arguments

handleable

A geometry vector (e.g., wkb(), wkt(), xy(), rct(), or sf::st_sfc()) for which wk_handle() is defined.
...

Passed to the wk_handle() method.
handler

A wk_handler object.
result

The result of a filter operation intended to be a transformation.

Value

A copy of handleable.

Examples

wk_identity(wkt("POINT (1 2)"))

Set and get vector geodesic edge interpolation

Description

Set and get vector geodesic edge interpolation

Usage

wk_is_geodesic(x)

wk_set_geodesic(x, geodesic)

wk_is_geodesic(x) <- value

wk_geodesic_inherit()

Arguments

x

An R object that contains edges
geodesic

TRUE if edges must be interpolated as geodesics when coordinates are spherical, FALSE otherwise.
value

See geodesic.

Value

TRUE if edges must be interpolated as geodesics when coordinates are spherical, FALSE otherwise.

Create lines, polygons, and collections

Description

Create lines, polygons, and collections

Usage

wk_linestring(handleable, feature_id = 1L, ..., geodesic = NULL)

wk_polygon(handleable, feature_id = 1L, ring_id = 1L, ..., geodesic = NULL)

wk_collection(
  handleable,
  geometry_type = wk_geometry_type("geometrycollection"),
  feature_id = 1L,
  ...
)

wk_linestring_filter(handler, feature_id = 1L)

wk_polygon_filter(handler, feature_id = 1L, ring_id = 1L)

wk_collection_filter(
  handler,
  geometry_type = wk_geometry_type("geometrycollection"),
  feature_id = 1L
)

Arguments

handleable

A geometry vector (e.g., wkb(), wkt(), xy(), rct(), or sf::st_sfc()) for which wk_handle() is defined.
feature_id

An identifier where changes in sequential values indicate a new feature. This is recycled silently as needed.
...

Passed to the wk_handle() method.
geodesic

Use TRUE or FALSE to explicitly force the geodesic-ness of the output.
ring_id

An identifier where changes in sequential values indicate a new ring. Rings are automatically closed. This is recycled silently as needed.
geometry_type

The collection type to create.
handler

A wk_handler object.

Value

An object of the same class as handleable with whose coordinates have been assembled into the given type.

Examples

wk_linestring(xy(c(1, 1), c(2, 3)))
wk_polygon(xy(c(0, 1, 0), c(0, 0, 1)))
wk_collection(xy(c(1, 1), c(2, 3)))

Extract feature-level meta

Description

These functions return the non-coordinate information of a geometry and/or vector. They do not parse an entire geometry/vector and are intended to be very fast even for large vectors.

Usage

wk_meta(handleable, ...)

## Default S3 method:
wk_meta(handleable, ...)

wk_vector_meta(handleable, ...)

## Default S3 method:
wk_vector_meta(handleable, ...)

wk_meta_handler()

wk_vector_meta_handler()

wk_geometry_type_label(geometry_type)

wk_geometry_type(geometry_type_label)

Arguments

handleable

A geometry vector (e.g., wkb(), wkt(), xy(), rct(), or sf::st_sfc()) for which wk_handle() is defined.
...

Passed to the wk_handle() method.
geometry_type

An integer code for the geometry type. These integers follow the WKB specification (e.g., 1 for point, 7 for geometrycollection).
geometry_type_label

A character vector of (lowercase) geometry type labels as would be found in WKT (e.g., point, geometrycollection).

Value

A data.frame with columns:

  • geometry_type: An integer identifying the geometry type. A value of 0 indicates that the types of geometry in the vector are not known without parsing the entire vector.

  • size: For points and linestrings, the number of coordinates; for polygons, the number of rings; for collections, the number of child geometries. A value of zero indicates an EMPTY geometry. A value of NA means this value is unknown without parsing the entire geometry.

  • has_z: TRUE if coordinates contain a Z value. A value of NA means this value is unknown without parsing the entire vector.

  • has_m: TRUE if coordinates contain an M value. A value of NA means this value is unknown without parsing the entire vector.

  • srid: An integer identifying a CRS or NA if this value was not provided.

  • precision: A grid size or 0.0 if a grid size was not provided. Note that coordinate values may not have been rounded; the grid size only refers to the level of detail with which they should be interpreted.

  • is_empty: TRUE if there is at least one non-empty coordinate. For the purposes of this value, a non-empty coordinate is one that contains at least one value that is not NA or NaN.

Examples

wk_vector_meta(as_wkt("LINESTRING (0 0, 1 1)"))
wk_meta(as_wkt("LINESTRING (0 0, 1 1)"))
wk_meta(as_wkb("LINESTRING (0 0, 1 1)"))

wk_geometry_type_label(1:7)
wk_geometry_type(c("point", "geometrycollection"))

Orient polygon coordinates

Description

Orient polygon coordinates

Usage

wk_orient(handleable, ..., direction = wk_counterclockwise())

wk_orient_filter(handler, direction = wk_counterclockwise())

wk_clockwise()

wk_counterclockwise()

Arguments

handleable

A geometry vector (e.g., wkb(), wkt(), xy(), rct(), or sf::st_sfc()) for which wk_handle() is defined.
...

Passed to the wk_handle() method.
direction

The winding polygon winding direction
handler

A wk_handler object.

Value

handleable with consistently oriented polygons, in direction winding order.

Examples

wk_orient(wkt("POLYGON ((0 0, 1 0, 1 1, 0 1, 0 0))"))
wk_orient(
  wkt("POLYGON ((0 0, 0 1, 1 1, 1 0, 0 0))"),
  direction = wk_clockwise()
)

Plot well-known geometry vectors

Description

Plot well-known geometry vectors

Usage

wk_plot(
  handleable,
  ...,
  asp = 1,
  bbox = NULL,
  xlab = "",
  ylab = "",
  rule = "evenodd",
  add = FALSE
)

## Default S3 method:
wk_plot(
  handleable,
  ...,
  asp = 1,
  bbox = NULL,
  xlab = "",
  ylab = "",
  rule = "evenodd",
  add = FALSE
)

## S3 method for class 'wk_wkt'
plot(
  x,
  ...,
  asp = 1,
  bbox = NULL,
  xlab = "",
  ylab = "",
  rule = "evenodd",
  add = FALSE
)

## S3 method for class 'wk_wkb'
plot(
  x,
  ...,
  asp = 1,
  bbox = NULL,
  xlab = "",
  ylab = "",
  rule = "evenodd",
  add = FALSE
)

## S3 method for class 'wk_xy'
plot(x, ..., asp = 1, bbox = NULL, xlab = "", ylab = "", add = FALSE)

## S3 method for class 'wk_rct'
plot(x, ..., asp = 1, bbox = NULL, xlab = "", ylab = "", add = FALSE)

## S3 method for class 'wk_crc'
plot(x, ..., asp = 1, bbox = NULL, xlab = "", ylab = "", add = FALSE)

Arguments

handleable

A geometry vector (e.g., wkb(), wkt(), xy(), rct(), or sf::st_sfc()) for which wk_handle() is defined.
...

Passed to plotting functions for features: graphics::points() for point and multipoint geometries, graphics::lines() for linestring and multilinestring geometries, and graphics::polypath() for polygon and multipolygon geometries.
asp, xlab, ylab

Passed to graphics::plot()
bbox

The limits of the plot as a rct() or compatible object
rule

The rule to use for filling polygons (see graphics::polypath())
add

Should a new plot be created, or should handleable be added to the existing plot?
x

A wkb() or wkt()

Value

The input, invisibly.

Examples

plot(as_wkt("LINESTRING (0 0, 1 1)"))
plot(as_wkb("LINESTRING (0 0, 1 1)"))

Validate well-known binary and well-known text

Description

The problems handler returns a character vector of parse errors and can be used to validate input of any type for which wk_handle() is defined.

Usage

wk_problems(handleable, ...)

wk_problems_handler()

Arguments

handleable

A geometry vector (e.g., wkb(), wkt(), xy(), rct(), or sf::st_sfc()) for which wk_handle() is defined.
...

Passed to the wk_handle() method.

Value

A character vector of parsing errors. NA signifies that there was no parsing error.

Examples

wk_problems(new_wk_wkt(c("POINT EMTPY", "POINT (20 30)")))
wk_handle(
  new_wk_wkt(c("POINT EMTPY", "POINT (20 30)")),
  wk_problems_handler()
)

Common CRS Representations

Description

These fixtures are calculated from PROJ version 9.1.0 and the database built from its source. They are used internally to transform and inspect coordinate reference systems.

Usage

wk_proj_crs_view

wk_proj_crs_json

Format

An object of class data.frame with 13387 rows and 7 columns.

An object of class data.frame with 13387 rows and 3 columns.

Examples

head(wk_proj_crs_view)
colnames(wk_proj_crs_json)

Set coordinate values

Description

Set coordinate values

Usage

wk_set_z(handleable, z, ...)

wk_set_m(handleable, m, ...)

wk_drop_z(handleable, ...)

wk_drop_m(handleable, ...)

wk_trans_set(value, use_z = NA, use_m = NA)

Arguments

handleable

A geometry vector (e.g., wkb(), wkt(), xy(), rct(), or sf::st_sfc()) for which wk_handle() is defined.
z, m

A vector of Z or M values applied feature-wise and recycled along handleable. Use NA to keep the existing value of a given feature.
...

Passed to the wk_handle() method.
value

An xy(), xyz(), xym(), or xyzm() of coordinates used to replace values in the input. Use NA to keep the existing value.
use_z, use_m

Used to declare the output type. Use TRUE to ensure the output has that dimension, FALSE to ensure it does not, and NA to leave the dimension unchanged.

Examples

wk_set_z(wkt("POINT (0 1)"), 2)
wk_set_m(wkt("POINT (0 1)"), 2)
wk_drop_z(wkt("POINT ZM (0 1 2 3)"))
wk_drop_m(wkt("POINT ZM (0 1 2 3)"))

Affine transformer

Description

Affine transformer

Usage

wk_trans_affine(trans_matrix)

wk_affine_identity()

wk_affine_rotate(rotation_deg)

wk_affine_scale(scale_x = 1, scale_y = 1)

wk_affine_translate(dx = 0, dy = 0)

wk_affine_fit(src, dst)

wk_affine_rescale(rct_in, rct_out)

wk_affine_compose(...)

wk_affine_invert(x)

Arguments

trans_matrix

A 3x3 transformation matrix
rotation_deg

A rotation to apply in degrees counterclockwise.
scale_x, scale_y

Scale factor to apply in the x and y directions, respectively
dx, dy

Coordinate offsets in the x and y direction
src, dst

Point vectors of control points used to estimate the affine mapping (using base::qr.solve()).
rct_in, rct_out

The input and output bounds
...

Zero or more transforms in the order they should be applied.
x

A wk_trans_affine()

Transform using explicit coordinate values

Description

A wk_trans implementation that replaces coordinate values using a vector of pre-calculated coordinates. This is used to perform generic transforms using R functions and system calls that are impossible or impractical to implement at the C level.

Usage

wk_trans_explicit(value, use_z = NA, use_m = NA)

Arguments

value

An xy(), xyz(), xym(), or xyzm() of coordinates used to replace values in the input. Use NA to keep the existing value.
use_z, use_m

Used to declare the output type. Use TRUE to ensure the output has that dimension, FALSE to ensure it does not, and NA to leave the dimension unchanged.

See Also

wk_coords() which has a replacement version "⁠wk_coords<-⁠"

Examples

trans <- wk_trans_explicit(xy(1:5, 1:5))
wk_transform(rep(xy(0, 0), 5), trans)

Generic transform class

Description

Generic transform class

Usage

wk_trans_inverse(trans, ...)

as_wk_trans(x, ...)

## S3 method for class 'wk_trans'
as_wk_trans(x, ...)

new_wk_trans(trans_ptr, subclass = character())

Arguments

trans

An external pointer to a wk_trans object
...

Passed to S3 methods
x

An object to be converted to a transform.
trans_ptr

An external pointer to a wk_trans_t transform struct.
subclass

An optional subclass to apply to the pointer

Apply coordinate transformations

Description

Apply coordinate transformations

Usage

wk_transform(handleable, trans, ...)

wk_transform_filter(handler, trans)

Arguments

handleable

A geometry vector (e.g., wkb(), wkt(), xy(), rct(), or sf::st_sfc()) for which wk_handle() is defined.
trans

An external pointer to a wk_trans object
...

Passed to the wk_handle() method.
handler

A wk_handler object.

Examples

wk_transform(xy(0, 0), wk_affine_translate(2, 3))

Translate geometry vectors

Description

Translate geometry vectors

Usage

## S3 method for class 'sfc'
wk_translate(handleable, to, ...)

wk_translate(handleable, to, ...)

## Default S3 method:
wk_translate(handleable, to, ...)

Arguments

handleable

A geometry vector (e.g., wkb(), wkt(), xy(), rct(), or sf::st_sfc()) for which wk_handle() is defined.
to

A prototype object.
...

Passed to the wk_handle() method.

Extract vertices

Description

These functions provide ways to extract individual coordinate values. Whereas wk_vertices() returns a vector of coordinates as in the same format as the input, wk_coords() returns a data frame with coordinates as columns.

Usage

wk_vertices(handleable, ...)

wk_coords(handleable, ...)

wk_coords(handleable, use_z = NA, use_m = NA) <- value

wk_vertex_filter(handler, add_details = FALSE)

Arguments

handleable

A geometry vector (e.g., wkb(), wkt(), xy(), rct(), or sf::st_sfc()) for which wk_handle() is defined.
...

Passed to the wk_handle() method.
use_z, use_m

Used to declare the output type. Use TRUE to ensure the output has that dimension, FALSE to ensure it does not, and NA to leave the dimension unchanged.
value

An xy(), xyz(), xym(), or xyzm() of coordinates used to replace values in the input. Use NA to keep the existing value.
handler

A wk_handler object.
add_details

Use TRUE to add a "wk_details" attribute, which contains columns feature_id, part_id, and ring_id.

Details

⁠wk_coords<-⁠ is the replacement-function version of 'wk_coords'. Using the engine of wk_trans_explicit() the coordinates of an object can be transformed in a generic way using R functions as needed.

Value

  • wk_vertices() extracts vertices and returns the in the same format as the handler

  • wk_coords() returns a data frame with columns columns feature_id (the index of the feature from whence it came), part_id (an arbitrary integer identifying the point, line, or polygon from whence it came), ring_id (an arbitrary integer identifying individual rings within polygons), and one column per coordinate (x, y, and/or z and/or m).

Examples

wk_vertices(wkt("LINESTRING (0 0, 1 1)"))
wk_coords(wkt("LINESTRING (0 0, 1 1)"))

# wk_coords() replacement function
x <- xy(1:5, 1:5)
y <- as_wkt(x)
wk_coords(y) <- cbind(5:1, 0:4)
wk_coords(x) <- y[5:1]
y
x

Do nothing

Description

This handler does nothing and returns NULL. It is useful for benchmarking readers and handlers and when using filters that have side-effects (e.g., wk_debug()). Note that this handler stops on the first parse error; to see a list of parse errors see the wk_problems() handler.

Usage

wk_void(handleable, ...)

wk_void_handler()

Arguments

handleable

A geometry vector (e.g., wkb(), wkt(), xy(), rct(), or sf::st_sfc()) for which wk_handle() is defined.
...

Passed to the wk_handle() method.

Value

NULL

Examples

wk_void(wkt("POINT (1 4)"))
wk_handle(wkt("POINT (1 4)"), wk_void_handler())

Write geometry vectors

Description

When writing transformation functions, it is often useful to know which handler should be used to create a (potentially modified) version of an object. Some transformers (e.g., wk_vertices()) modify the geometry type of an object, in which case a generic writer is needed. This defaults to wkb_writer() because it is fast and can handle all geometry types.

Usage

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

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

sfc_writer(promote_multi = FALSE)

wkb_writer(buffer_size = 2048L, endian = NA_integer_)

wkt_writer(precision = 16L, trim = TRUE)

wk_writer(handleable, ..., generic = FALSE)

## Default S3 method:
wk_writer(handleable, ...)

## S3 method for class 'wk_wkt'
wk_writer(handleable, ..., precision = 16, trim = TRUE)

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

## S3 method for class 'wk_xy'
wk_writer(handleable, ..., generic = FALSE)

xy_writer()

Arguments

handleable

A geometry vector (e.g., wkb(), wkt(), xy(), rct(), or sf::st_sfc()) for which wk_handle() is defined.
...

Passed to the writer constructor.
promote_multi

Use TRUE to promote all simple geometries to a multi type when reading to sfc. This is useful to increase the likelihood that the sfc will contain a single geometry type.
buffer_size

Control the initial buffer size used when writing WKB.
endian

Use 1 for little endian, 0 for big endian, or NA for system endian.
precision

If trim is TRUE, the total number of significant digits to keep for each result or the number of digits after the decimal place otherwise.
trim

Use FALSE to keep trailing zeroes after the decimal place.
generic

Use TRUE to obtain a writer that can write all geometry types.

Value

A wk_handler.

Mark lists of raw vectors as well-known binary

Description

Mark lists of raw vectors as well-known binary

Usage

wkb(x = list(), crs = wk_crs_auto(), geodesic = FALSE)

parse_wkb(x, crs = wk_crs_auto(), geodesic = FALSE)

wk_platform_endian()

as_wkb(x, ...)

## Default S3 method:
as_wkb(x, ...)

## S3 method for class 'character'
as_wkb(x, ..., crs = NULL, geodesic = FALSE)

## S3 method for class 'wk_wkb'
as_wkb(x, ...)

## S3 method for class 'blob'
as_wkb(x, ..., crs = NULL, geodesic = FALSE)

## S3 method for class 'WKB'
as_wkb(x, ..., crs = NULL, geodesic = FALSE)

Arguments

x

A list() of raw() vectors or NULL.
crs

A value to be propagated as the CRS for this vector.
geodesic

TRUE if edges must be interpolated as geodesics when coordinates are spherical, FALSE otherwise.
...

Unused

Value

A new_wk_wkb()

Examples

as_wkb("POINT (20 10)")

Convert well-known binary to hex

Description

Convert well-known binary to hex

Usage

wkb_to_hex(x)

Arguments

x

A wkb() vector

Value

A hex encoded wkb() vector

Examples

x <- as_wkb(xyz(1:5, 6:10, 11:15))
wkb_to_hex(x)

Deprecated functions

Description

These functions are deprecated and will be removed in a future version.

Usage

wkb_translate_wkt(wkb, ..., precision = 16, trim = TRUE)

wkb_translate_wkb(wkb, ..., endian = NA_integer_)

wkt_translate_wkt(wkt, ..., precision = 16, trim = TRUE)

wkt_translate_wkb(wkt, ..., endian = NA_integer_)

Arguments

wkb

A list() of raw() vectors, such as that returned by sf::st_as_binary().
...

Used to keep backward compatibility with previous versions of these functions.
precision

The rounding precision to use when writing (number of decimal places).
trim

Trim unnecessary zeroes in the output?
endian

Force the endian of the resulting WKB.
wkt

A character vector containing well-known text.

Mark character vectors as well-known text

Description

Mark character vectors as well-known text

Usage

wkt(x = character(), crs = wk_crs_auto(), geodesic = FALSE)

parse_wkt(x, crs = wk_crs_auto(), geodesic = FALSE)

as_wkt(x, ...)

## Default S3 method:
as_wkt(x, ...)

## S3 method for class 'character'
as_wkt(x, ..., crs = NULL, geodesic = FALSE)

## S3 method for class 'wk_wkt'
as_wkt(x, ...)

Arguments

x

A character() vector containing well-known text.
crs

A value to be propagated as the CRS for this vector.
geodesic

TRUE if edges must be interpolated as geodesics when coordinates are spherical, FALSE otherwise.
...

Unused

Value

A new_wk_wkt()

Examples

wkt("POINT (20 10)")

Efficient point vectors

Description

Efficient point vectors

Usage

xy(x = double(), y = double(), crs = wk_crs_auto())

xyz(x = double(), y = double(), z = double(), crs = wk_crs_auto())

xym(x = double(), y = double(), m = double(), crs = wk_crs_auto())

xyzm(
  x = double(),
  y = double(),
  z = double(),
  m = double(),
  crs = wk_crs_auto()
)

xy_dims(x)

as_xy(x, ...)

## Default S3 method:
as_xy(x, ..., dims = NULL)

## S3 method for class 'wk_xy'
as_xy(x, ..., dims = NULL)

## S3 method for class 'matrix'
as_xy(x, ..., crs = NULL)

## S3 method for class 'data.frame'
as_xy(x, ..., dims = NULL, crs = NULL)

Arguments

x, y, z, m

Coordinate values.
crs

A value to be propagated as the CRS for this vector.
...

Passed to methods.
dims

A set containing one or more of c("x", "y", "z", "m").

Value

A vector of coordinate values.

Examples

xy(1:5, 1:5)
xyz(1:5, 1:5, 10)
xym(1:5, 1:5, 10)
xyzm(1:5, 1:5, 10, 12)

# NA, NA maps to a null/na feature; NaN, NaN maps to EMPTY
as_wkt(xy(NaN, NaN))
as_wkt(xy(NA, NA))

XY vector extractors

Description

XY vector extractors

Usage

xy_x(x)

xy_y(x)

xy_z(x)

xy_m(x)

Arguments

x

An xy() vector

Value

Components of the xy() vector or NULL if the dimension is missing

Examples

x <- xyz(1:5, 6:10, 11:15)
xy_x(x)
xy_y(x)
xy_z(x)
xy_m(x)