Converts a character string of c-squares in a spatially explicit simple features object
(sf. It can also convert data.frames with a column of c-squares codes to
an sf object.
st_as_sf.csquares(x, ..., use_geometry = TRUE)
st_as_sfc.csquares(x, ..., use_geometry = TRUE)A vector of character strings. Each element should hold a valid
c-square code. x can also be a data.frame with a column of c-square codes.
(Note that wildcard characters are not supported)
Ignored
If use_geometry is TRUE and x inherits a spatial feature,
its geometry will be used to cast the object. This is much faster than its alternative
when use_geometry is FALSE. In the latter case, the c-square codes are first translated
into explicit spatial information. The latter is more reliable as it does not rely on
the assumption that the geometry of x corresponds with the csquares codes in the object.
In short: use TRUE for speed, use FALSE for reliability.
In case of st_as_sfc.csquares a list of geometries (sfc,
(MULTI)POLYGONS) is returned. In case of st_as_sf.csquares an object of class
(sf) is returned.
library(sf)
st_as_sfc(as_csquares("7500:110:3|7500:110:1|1500:110:3|1500:110:1"))
#> Geometry set for 1 feature
#> Geometry type: POLYGON
#> Dimension: XY
#> Bounding box: xmin: -0.5 ymin: 51 xmax: 0.5 ymax: 52
#> CRS: NA
#> POLYGON ((-0.5 51.5, -0.5 52, 0 52, 0.5 52, 0.5...
st_as_sf(as_csquares("7500:110:3|7500:110:1|1500:110:3|1500:110:1"))
#> Simple feature collection with 1 feature and 1 field
#> Geometry type: POLYGON
#> Dimension: XY
#> Bounding box: xmin: -0.5 ymin: 51 xmax: 0.5 ymax: 52
#> Geodetic CRS: WGS 84
#> # A tibble: 1 × 2
#> csquares geom
#> * <csquares> <POLYGON [°]>
#> 1 7500:110:3|7500:110:1|1500:110:3|1500:110:1 ((-0.5 51.5, -0.5 52, 0 52, 0.5 5…