Given an sf or sfc object create a list that represents the extent of the
object. The result of this function can be parsed directly into json using
jsonify::to_json(x, unbox = TRUE) or included into a list as the extent
component that will be eventually converted into json using the above function.
Usage
as_extent(x, crs = sf::st_crs(x), call = rlang::caller_env())Arguments
- x
an sf or sfc object
- crs
the CRS of the object. Must be parsable 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
callwhen throwing a condition from a helper function which wouldn't be relevant to mention in the message.Can also be
NULLor 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.
Examples
nc <- sf::st_read(system.file("shape/nc.shp", package = "sf"), quiet = TRUE)
as_extent(nc)
#> $xmin
#> [1] -84.32385
#>
#> $ymin
#> [1] 33.88199
#>
#> $xmax
#> [1] -75.45698
#>
#> $ymax
#> [1] 36.58965
#>
#> $spatialReference
#> $spatialReference$wkid
#> [1] 4267
#>
#>