sfc_multilinestring {sfheaders}

sfc MULTILINESTRING

Description

constructs an sfc of MULTILINESTRING objects

Usage

sfc_multilinestring(
  obj = NULL,
  x = NULL,
  y = NULL,
  z = NULL,
  m = NULL,
  multilinestring_id = NULL,
  linestring_id = NULL
)

Arguments

obj

sorted matrix or data.frame

x

x geometry column

y

y geometry column

z

z geometry column

m

m geometry column

multilinestring_id

column of ids for multilinestrings

linestring_id

column of ids for linestrings (within multilinestrings)

Value

sfc object of MULTILINESTRING geometries

notes

sfheaders functions do not perform any validity checks on the geometries. Nor do they set Coordinate Reference Systems, EPSG, PROJ4 or precision attributes.

The data.frame and matrices you send into the sfheader functions must be ordered.

Examples

m <- matrix(c(0,0,0,0,1,1), ncol = 3 )
sfc_multilinestring( m )

m <- matrix(c(0,0,0,0,0,1,0,1,1,1,2,2,1,2,3), ncol = 3, byrow = TRUE)
sfc_multilinestring( obj = m )
sfc_multilinestring( obj = m, multilinestring_id = 1 )
sfc_multilinestring( obj = m, linestring_id = 1 )

sfc_multilinestring( obj = m, linestring_id = 1, multilinestring_id = 1 )

sfc_multilinestring( obj = m, x = 2, y = 3 )
sfc_multilinestring( obj = m, x = 1, y = 2, z = 3 )
sfc_multilinestring( obj = m, x = 2, y = 3, linestring_id = 1, multilinestring_id = 1 )

df <- data.frame(
  ml_id = c(1,1,1,1,1,1,1,1,2,2,2,2,2)
  , l_id = c(1,1,1,2,2,3,3,3,1,1,1,2,2)
  , x = rnorm(13)
  , y = rnorm(13)
  , z = rnorm(13)
  , m = rnorm(13)
)

sfc_multilinestring( obj = df, x = "x", y = "y")
sfc_multilinestring( obj = df, x = "x", y = "y", z = "z")
sfc_multilinestring( obj = df, x = "x", y = "y", z = "z", m = "m")

sfc_multilinestring( obj = df, x = 2, y = 3)
sfc_multilinestring( obj = df, x = 2, y = 3, z = 4)
sfc_multilinestring( obj = df, x = 2, y = 3, z = 4, m = 5)

sfc_multilinestring( obj = df, multilinestring_id = "ml_id", linestring_id = "l_id" )
sfc_multilinestring( obj = df, multilinestring_id = 1, linestring_id = 2 )