st_as_sfc

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Convert foreign geometry object to an sfc object

Convert foreign geometry object to an sfc object

Usage
# S3 method for list
st_as_sfc(x, ..., crs = NA_crs_)

# S3 method for blob st_as_sfc(x, ...)

# S3 method for bbox st_as_sfc(x, ...)

# S3 method for WKB st_as_sfc(x, ..., EWKB = FALSE, spatialite = FALSE, pureR = FALSE, crs = NA_crs_)

# S3 method for character st_as_sfc(x, crs = NA_integer_, ..., GeoJSON = FALSE)

# S3 method for factor st_as_sfc(x, ...)

st_as_sfc(x, ...)

# S3 method for SpatialPoints st_as_sfc(x, ..., precision = 0)

# S3 method for SpatialPixels st_as_sfc(x, ..., precision = 0)

# S3 method for SpatialMultiPoints st_as_sfc(x, ..., precision = 0)

# S3 method for SpatialLines st_as_sfc(x, ..., precision = 0, forceMulti = FALSE)

# S3 method for SpatialPolygons st_as_sfc(x, ..., precision = 0, forceMulti = FALSE)

# S3 method for map st_as_sfc(x, ...)

Arguments
x

object to convert

...

further arguments

crs

integer or character; coordinate reference system for the

EWKB

logical; if TRUE, parse as EWKB (extended WKB; PostGIS: ST_AsEWKB), otherwise as ISO WKB (PostGIS: ST_AsBinary)

spatialite

logical; if TRUE, WKB is assumed to be in the spatialite dialect, see https://www.gaia-gis.it/gaia-sins/BLOB-Geometry.html; this is only supported in native endian-ness (i.e., files written on system with the same endian-ness as that on which it is being read).

pureR

logical; if TRUE, use only R code, if FALSE, use compiled (C++) code; use TRUE when the endian-ness of the binary differs from the host machine (.Platform$endian).

GeoJSON

logical; if TRUE, try to read geometries from GeoJSON text strings geometry, see st_crs()

precision

precision value; see st_as_binary

forceMulti

logical; if TRUE, force coercion into MULTIPOLYGON or MULTILINE objects, else autodetect

Details

When converting from WKB, the object x is either a character vector such as typically obtained from PostGIS (either with leading "0x" or without), or a list with raw vectors representing the features in binary (raw) form.

If x is a character vector, it should be a vector containing well-known-text, or Postgis EWKT or GeoJSON representations of a single geometry for each vector element.

If x is a factor, it is converted to character.

Aliases
  • st_as_sfc
  • st_as_sfc.list
  • st_as_sfc
  • st_as_sfc.blob
  • st_as_sfc
  • st_as_sfc.bbox
  • st_as_sfc
  • st_as_sfc.WKB
  • st_as_sfc
  • st_as_sfc.character
  • st_as_sfc
  • st_as_sfc.factor
  • st_as_sfc
  • st_as_sfc
  • st_as_sfc.SpatialPoints
  • st_as_sfc
  • st_as_sfc.SpatialPixels
  • st_as_sfc
  • st_as_sfc.SpatialMultiPoints
  • st_as_sfc
  • st_as_sfc.SpatialLines
  • st_as_sfc
  • st_as_sfc.SpatialPolygons
  • st_as_sfc
  • st_as_sfc.map
Examples
# NOT RUN {
wkb = structure(list("01010000204071000000000000801A064100000000AC5C1441"), class = "WKB")
st_as_sfc(wkb, EWKB = TRUE)
wkb = structure(list("0x01010000204071000000000000801A064100000000AC5C1441"), class = "WKB")
st_as_sfc(wkb, EWKB = TRUE)
st_as_sfc("SRID=3978;LINESTRING(1663106 -105415,1664320 -104617)")
# }
Documentation reproduced from package sf, version 0.6-0, License: GPL-2 | MIT + file LICENSE

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