Return Well-known Text representation of simple feature geometry or coordinate reference system
Source:R/crs.R
, R/wkt.R
st_as_text.Rd
Return Well-known Text representation of simple feature geometry or coordinate reference system
Usage
# S3 method for class 'crs'
st_as_text(x, ..., projjson = FALSE, pretty = FALSE)
st_as_text(x, ...)
# S3 method for class 'sfg'
st_as_text(x, ...)
# S3 method for class 'sfc'
st_as_text(x, ..., EWKT = FALSE)
Arguments
- x
object of class
sfg
,sfc
orcrs
- ...
modifiers; in particular
digits
can be passed to control the number of digits used- projjson
logical; if TRUE, return projjson form (requires GDAL 3.1 and PROJ 6.2), else return well-known-text form
- pretty
logical; if TRUE, print human-readable well-known-text representation of a coordinate reference system
- EWKT
logical; if TRUE, print SRID=xxx; before the WKT string if
epsg
is available
Details
The returned WKT representation of simple feature geometry conforms to the simple features access specification and extensions (known as EWKT, supported by PostGIS and other simple features implementations for addition of a SRID to a WKT string).
Note
To improve conversion performance, the lwgeom package can be used (it must be installed
beforehand) and set the Sys.setenv("LWGEOM_WKT" = "true")
environment variable. This
will also result in faster printing of complex geometries. Note that the representation as WKT is
different from the sf package and may cause reproducibility problems. An alternative solution is
to use the lwgeom::st_astext()
or wk::as_wkt()
functions.