as_spatraster() turns an existing data frame or tibble, into a SpatRaster.
This is a wrapper of terra::rast() S4 method for data.frame.
Arguments
- x
A tibble or data frame.
- ...
additional arguments passed on to
terra::rast().- xycols
A vector of integers of length 2 determining the position of the columns that hold the x and y coordinates.
- crs
A crs on several formats (PROJ.4, WKT, EPSG code, ..) or and spatial object from sf or terra that includes the target coordinate reference system. See
pull_crs(). See Details.- digits
integer to set the precision for detecting whether points are on a regular grid (a low number of digits is a low precision).
Details
![[Questioning]](figures/lifecycle-questioning.svg)
If no crs is provided and the tibble
has been created with the method as_tibble.SpatRaster(), the crs is
inferred from attr(x, "crs").
See also
Coercing objects:
as_coordinates(),
as_sf(),
as_spatvector(),
as_tibble.Spat,
fortify.Spat
Examples
library(terra)
r <- rast(matrix(1:90, ncol = 3), crs = "EPSG:3857")
r
#> class : SpatRaster
#> dimensions : 30, 3, 1 (nrow, ncol, nlyr)
#> resolution : 1, 1 (x, y)
#> extent : 0, 3, 0, 30 (xmin, xmax, ymin, ymax)
#> coord. ref. : WGS 84 / Pseudo-Mercator (EPSG:3857)
#> source(s) : memory
#> name : lyr.1
#> min value : 1
#> max value : 90
# Create tibble
as_tbl <- as_tibble(r, xy = TRUE)
as_tbl
#> # A tibble: 90 × 3
#> x y lyr.1
#> <dbl> <dbl> <int>
#> 1 0.5 29.5 1
#> 2 1.5 29.5 31
#> 3 2.5 29.5 61
#> 4 0.5 28.5 2
#> 5 1.5 28.5 32
#> 6 2.5 28.5 62
#> 7 0.5 27.5 3
#> 8 1.5 27.5 33
#> 9 2.5 27.5 63
#> 10 0.5 26.5 4
#> # ℹ 80 more rows
# From tibble
newrast <- as_spatraster(as_tbl, crs = "EPSG:3857")
newrast
#> class : SpatRaster
#> dimensions : 30, 3, 1 (nrow, ncol, nlyr)
#> resolution : 1, 1 (x, y)
#> extent : 0, 3, 0, 30 (xmin, xmax, ymin, ymax)
#> coord. ref. : WGS 84 / Pseudo-Mercator (EPSG:3857)
#> source(s) : memory
#> name : lyr.1
#> min value : 1
#> max value : 90