sfheaders (version 0.4.4)

sfg_multipolygon: sfg multipolygon

Description

constructs sfg MULTIPOLYGON object

Usage

sfg_multipolygon(
  obj,
  x = NULL,
  y = NULL,
  z = NULL,
  m = NULL,
  polygon_id = NULL,
  linestring_id = NULL,
  close = TRUE
)

Value

sfg object of MULTIPOLYGON geometry

Arguments

obj

matrix or data.frame

x

x geometry column

y

y geometry column

z

z geometry column

m

m geometry column

polygon_id

column of ids for polygons (within the multipolygon)

linestring_id

column of ids for lines (within polygons)

close

logical indicating whether polygons should be closed. If TRUE, all polygons will be checked and force closed if possible

Examples

df <- data.frame(
  polygon_id = c(rep(1, 5), rep(2, 10))
  , line_id = c(rep(1, 10), rep(2, 5))
  , x = c(0,0,1,1,0,2,2,5,5,2,3,3,4,4,3)
  , y = c(0,1,1,0,0,2,5,5,2,2,3,4,4,3,3)
  , z = c(1)
  , m = c(1)
)

m <- as.matrix( df )

sfg_multipolygon( df[, c("x","y") ] )

sfg_multipolygon(
  df, x = "x", y = "y", polygon_id = "polygon_id", linestring_id = "line_id"
  )
sfg_multipolygon(
  df, x = "x", y = "y", z = "z", polygon_id = "polygon_id", linestring_id = "line_id"
  )
sfg_multipolygon(
  df, x = "x", y = "y", z = "z", m = "m", polygon_id = "polygon_id", linestring_id = "line_id"
  )


sfg_multipolygon( m[, c("x","y") ] )

sfg_multipolygon(
  m, x = "x", y = "y", polygon_id = "polygon_id", linestring_id = "line_id"
  )
sfg_multipolygon(
  m, x = "x", y = "y", z = "z", polygon_id = "polygon_id", linestring_id = "line_id"
  )
sfg_multipolygon(
  m, x = "x", y = "y", z = "z", m = "m", polygon_id = "polygon_id", linestring_id = "line_id"
  )