as_sf() turns a SpatVector to sf. This is a wrapper of sf::st_as_sf()
with the particularity that the groups created with group_by() are
preserved.
Arguments
- x
A SpatVector.
- ...
additional arguments passed on to
sf::st_as_sf().
See also
Coercing objects:
as_coordinates(),
as_spatraster(),
as_spatvector(),
as_tibble.Spat,
fortify.Spat
Examples
library(terra)
f <- system.file("extdata/cyl.gpkg", package = "tidyterra")
v <- terra::vect(f)
# This is ungrouped
v
#> class : SpatVector
#> geometry : polygons
#> dimensions : 9, 3 (geometries, attributes)
#> extent : 2892687, 3341372, 2017622, 2361600 (xmin, xmax, ymin, ymax)
#> source : cyl.gpkg
#> coord. ref. : ETRS89-extended / LAEA Europe (EPSG:3035)
#> names : iso2 cpro name
#> type : <chr> <chr> <chr>
#> values : ES-AV 05 Avila
#> ES-BU 09 Burgos
#> ES-LE 24 Leon
is_grouped_spatvector(v)
#> [1] FALSE
# Get an ungrouped data
a_sf <- as_sf(v)
dplyr::is_grouped_df(a_sf)
#> [1] FALSE
# Grouped
v$gr <- c("C", "A", "A", "B", "A", "B", "B")
v$gr2 <- rep(c("F", "G", "F"), 3)
gr_v <- group_by(v, gr, gr2)
gr_v
#> class : SpatVector
#> geometry : polygons
#> dimensions : 9, 5 (geometries, attributes)
#> extent : 2892687, 3341372, 2017622, 2361600 (xmin, xmax, ymin, ymax)
#> source : cyl.gpkg
#> coord. ref. : ETRS89-extended / LAEA Europe (EPSG:3035)
#> names : iso2 cpro name gr gr2
#> type : <chr> <chr> <chr> <chr> <chr>
#> values : ES-AV 05 Avila C F
#> ES-BU 09 Burgos A G
#> ES-LE 24 Leon A F
is_grouped_spatvector(gr_v)
#> [1] TRUE
group_data(gr_v)
#> # A tibble: 5 × 3
#> gr gr2 .rows
#> <chr> <chr> <list<int>>
#> 1 A F [2]
#> 2 A G [2]
#> 3 B F [3]
#> 4 C F [1]
#> 5 C G [1]
# A sf
a_gr_sf <- as_sf(gr_v)
dplyr::is_grouped_df(a_gr_sf)
#> [1] TRUE
group_data(a_gr_sf)
#> # A tibble: 5 × 3
#> gr gr2 .rows
#> <chr> <chr> <list<int>>
#> 1 A F [2]
#> 2 A G [2]
#> 3 B F [3]
#> 4 C F [1]
#> 5 C G [1]