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Create Esri Features

Source: R/esri-features-list.R, R/esri-features-string.R
features.Rd

These functions create an array of Esri Feature objects. Each feature consists of a geometry and attribute field. The result of as_esri_features() is a JSON array of Features whereas as_features() is a list that represents the same JSON array. Using jsonify::to_json(as_features(x), unbox = TRUE) will result in the same JSON array.

Usage

as_features(x, crs = sf::st_crs(x), call = rlang::caller_env())

as_esri_features(x, crs = sf::st_crs(x), call = rlang::caller_env())

Arguments

x

an object of class sf, data.frame, or sfc.

crs

the coordinate reference system. It must be interpretable by sf::st_crs().

call

The execution environment of a currently running function, e.g. call = caller_env(). The corresponding function call is retrieved and mentioned in error messages as the source of the error.

You only need to supply call when throwing a condition from a helper function which wouldn't be relevant to mention in the message.

Can also be NULL or a defused function call to respectively not display any call or hard-code a code to display.

For more information about error calls, see Including function calls in error messages.

Value

Either a scalar string or a named list.

References

API Reference

Examples


library(sf)
# POINT
# create sfg points
xy <- st_sfc(st_point(c(1, 2)))
xyz <- st_sfc(st_point(c(1, 2, 3)))
xym <- st_sfc(st_point(c(1, 2, 3), dim = "XYM"))

as_esri_features(xy)
#> [1] "[{\"geometry\":{\"x\":1.0,\"y\":2.0,\"spatialReference\":{}},\"attributes\":{}}]"
as_esri_features(xyz)
#> [1] "[{\"geometry\":{\"x\":1.0,\"y\":2.0,\"z\":3.0,\"spatialReference\":{}},\"attributes\":{}}]"
as_esri_features(xym)
#> [1] "[{\"geometry\":{\"x\":1.0,\"y\":2.0,\"m\":3.0,\"spatialReference\":{}},\"attributes\":{}}]"

# MULTIPOINT
# vector to create matrix points
set.seed(0)
x <- rnorm(12)

xy <- st_sfc(st_multipoint(matrix(x, ncol = 2)))
xyz <- st_sfc(st_multipoint(matrix(x, ncol = 3)))
xym <- st_sfc(st_multipoint(matrix(x, ncol = 3), dim = "XYM"))

as_esri_features(xy)
#> [1] "[{\"geometry\":{\"hasZ\":false,\"hasM\":false,\"points\":[[1.2629542848807933,-0.9285670347135381],[-0.3262333607056494,-0.2947204467905602],[1.3297992629225006,-0.005767172747536955],[1.2724293214294047,2.404653388857951],[0.4146414344564082,0.7635934611404596],[-1.5399500419037095,-0.7990092489893682]],\"spatialReference\":{}},\"attributes\":{}}]"
as_esri_features(xyz)
#> [1] "[{\"geometry\":{\"hasZ\":true,\"hasM\":false,\"points\":[[1.2629542848807933,0.4146414344564082,-0.005767172747536955],[-0.3262333607056494,-1.5399500419037095,2.404653388857951],[1.3297992629225006,-0.9285670347135381,0.7635934611404596],[1.2724293214294047,-0.2947204467905602,-0.7990092489893682]],\"spatialReference\":{}},\"attributes\":{}}]"
as_esri_features(xym)
#> [1] "[{\"geometry\":{\"hasZ\":false,\"hasM\":true,\"points\":[[1.2629542848807933,0.4146414344564082,-0.005767172747536955],[-0.3262333607056494,-1.5399500419037095,2.404653388857951],[1.3297992629225006,-0.9285670347135381,0.7635934611404596],[1.2724293214294047,-0.2947204467905602,-0.7990092489893682]],\"spatialReference\":{}},\"attributes\":{}}]"

# LINESTRING
xy <- st_sfc(st_linestring(matrix(x, ncol = 2)))
xyz <- st_sfc(st_linestring(matrix(x, ncol = 3)))
xym <- st_sfc(st_linestring(matrix(x, ncol = 3), dim = "XYM"))

as_esri_features(xy)
#> [1] "[{\"geometry\":{\"hasZ\":false,\"hasM\":false,\"paths\":[[[1.2629542848807933,-0.9285670347135381],[-0.3262333607056494,-0.2947204467905602],[1.3297992629225006,-0.005767172747536955],[1.2724293214294047,2.404653388857951],[0.4146414344564082,0.7635934611404596],[-1.5399500419037095,-0.7990092489893682]]],\"spatialReference\":{}},\"attributes\":{}}]"
as_esri_features(xyz)
#> [1] "[{\"geometry\":{\"hasZ\":true,\"hasM\":false,\"paths\":[[[1.2629542848807933,0.4146414344564082,-0.005767172747536955],[-0.3262333607056494,-1.5399500419037095,2.404653388857951],[1.3297992629225006,-0.9285670347135381,0.7635934611404596],[1.2724293214294047,-0.2947204467905602,-0.7990092489893682]]],\"spatialReference\":{}},\"attributes\":{}}]"
as_esri_features(xym)
#> [1] "[{\"geometry\":{\"hasZ\":false,\"hasM\":true,\"paths\":[[[1.2629542848807933,0.4146414344564082,-0.005767172747536955],[-0.3262333607056494,-1.5399500419037095,2.404653388857951],[1.3297992629225006,-0.9285670347135381,0.7635934611404596],[1.2724293214294047,-0.2947204467905602,-0.7990092489893682]]],\"spatialReference\":{}},\"attributes\":{}}]"

# MULTILINESTRING
as_esri_features(st_sfc(st_multilinestring(list(xy[[1]], xy[[1]]))))
#> [1] "[{\"geometry\":{\"hasZ\":false,\"hasM\":false,\"paths\":[[[1.2629542848807933,-0.9285670347135381],[-0.3262333607056494,-0.2947204467905602],[1.3297992629225006,-0.005767172747536955],[1.2724293214294047,2.404653388857951],[0.4146414344564082,0.7635934611404596],[-1.5399500419037095,-0.7990092489893682]],[[1.2629542848807933,-0.9285670347135381],[-0.3262333607056494,-0.2947204467905602],[1.3297992629225006,-0.005767172747536955],[1.2724293214294047,2.404653388857951],[0.4146414344564082,0.7635934611404596],[-1.5399500419037095,-0.7990092489893682]]],\"spatialReference\":{}},\"attributes\":{}}]"
as_esri_features(st_sfc(st_multilinestring(list(xyz[[1]], xyz[[1]]))))
#> [1] "[{\"geometry\":{\"hasZ\":true,\"hasM\":false,\"paths\":[[[1.2629542848807933,0.4146414344564082,-0.005767172747536955],[-0.3262333607056494,-1.5399500419037095,2.404653388857951],[1.3297992629225006,-0.9285670347135381,0.7635934611404596],[1.2724293214294047,-0.2947204467905602,-0.7990092489893682]],[[1.2629542848807933,0.4146414344564082,-0.005767172747536955],[-0.3262333607056494,-1.5399500419037095,2.404653388857951],[1.3297992629225006,-0.9285670347135381,0.7635934611404596],[1.2724293214294047,-0.2947204467905602,-0.7990092489893682]]],\"spatialReference\":{}},\"attributes\":{}}]"
as_esri_features(st_sfc(st_multilinestring(list(xym[[1]], xym[[1]]))))
#> [1] "[{\"geometry\":{\"hasZ\":true,\"hasM\":false,\"paths\":[[[1.2629542848807933,0.4146414344564082,-0.005767172747536955],[-0.3262333607056494,-1.5399500419037095,2.404653388857951],[1.3297992629225006,-0.9285670347135381,0.7635934611404596],[1.2724293214294047,-0.2947204467905602,-0.7990092489893682]],[[1.2629542848807933,0.4146414344564082,-0.005767172747536955],[-0.3262333607056494,-1.5399500419037095,2.404653388857951],[1.3297992629225006,-0.9285670347135381,0.7635934611404596],[1.2724293214294047,-0.2947204467905602,-0.7990092489893682]]],\"spatialReference\":{}},\"attributes\":{}}]"

# POLYGON
coords <- rbind(
  c(0, 0, 0, 1),
  c(0, 1, 0, 1),
  c(1, 1, 1, 1),
  c(1, 0, 1, 1),
  c(0, 0, 0, 1)
)

xy <- st_sfc(st_polygon(list(coords[, 1:2])))
xyz <- st_sfc(st_polygon(list(coords[, 1:3])))
xym <- st_sfc(st_polygon(list(coords[, 1:3]), dim = "XYM"))

as_esri_features(xy)
#> [1] "[{\"geometry\":{\"hasZ\":false,\"hasM\":false,\"rings\":[[[0.0,0.0],[0.0,1.0],[1.0,1.0],[1.0,0.0],[0.0,0.0]]],\"spatialReference\":{}},\"attributes\":{}}]"
as_esri_features(xyz)
#> [1] "[{\"geometry\":{\"hasZ\":true,\"hasM\":false,\"rings\":[[[0.0,0.0,0.0],[0.0,1.0,0.0],[1.0,1.0,1.0],[1.0,0.0,1.0],[0.0,0.0,0.0]]],\"spatialReference\":{}},\"attributes\":{}}]"
as_esri_features(xym)
#> [1] "[{\"geometry\":{\"hasZ\":false,\"hasM\":true,\"rings\":[[[0.0,0.0,0.0],[0.0,1.0,0.0],[1.0,1.0,1.0],[1.0,0.0,1.0],[0.0,0.0,0.0]]],\"spatialReference\":{}},\"attributes\":{}}]"

# MULTIPOLYGON
as_esri_features(st_sfc(st_multipolygon(list(xy[[1]], xy[[1]]))))
#> [1] "[{\"geometry\":{\"hasZ\":false,\"hasM\":false,\"rings\":[[[0.0,0.0],[0.0,1.0],[1.0,1.0],[1.0,0.0],[0.0,0.0]],[[0.0,0.0],[0.0,1.0],[1.0,1.0],[1.0,0.0],[0.0,0.0]]],\"spatialReference\":{}},\"attributes\":{}}]"
as_esri_features(st_sfc(st_multipolygon(list(xyz[[1]], xyz[[1]]))))
#> [1] "[{\"geometry\":{\"hasZ\":true,\"hasM\":false,\"rings\":[[[0.0,0.0,0.0],[0.0,1.0,0.0],[1.0,1.0,1.0],[1.0,0.0,1.0],[0.0,0.0,0.0]],[[0.0,0.0,0.0],[0.0,1.0,0.0],[1.0,1.0,1.0],[1.0,0.0,1.0],[0.0,0.0,0.0]]],\"spatialReference\":{}},\"attributes\":{}}]"
as_esri_features(st_sfc(st_multipolygon(list(xym[[1]], xym[[1]]))))
#> [1] "[{\"geometry\":{\"hasZ\":true,\"hasM\":false,\"rings\":[[[0.0,0.0,0.0],[0.0,1.0,0.0],[1.0,1.0,1.0],[1.0,0.0,1.0],[0.0,0.0,0.0]],[[0.0,0.0,0.0],[0.0,1.0,0.0],[1.0,1.0,1.0],[1.0,0.0,1.0],[0.0,0.0,0.0]]],\"spatialReference\":{}},\"attributes\":{}}]"