sfg_polygon: sfg polygon

In sfheaders: Converts Between R Objects and Simple Feature Objects

sfg polygon

Description

constructs sfg POLYGON object

Usage

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

Arguments

obj	matrix or data.frame
x	x geometry column
y	y geometry column
z	z geometry column
m	m geometry column
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

Value

sfg object of POLYGON geometry

Examples

sfg_polygon( matrix( 1:24, ncol = 2 ) )
sfg_polygon( matrix( 1:24, ncol = 3 ) )
sfg_polygon( matrix( 1:24, ncol = 4 ) )

## different lines
m <- cbind( matrix( 1:24, ncol = 2 ), c(rep(1, 6), rep(2, 6) ) )
sfg_polygon( obj = m, x = 1, y = 2, linestring_id = 3 )

## just specifying linestring_id will use all others as the geometries
sfg_polygon( obj = m, linestring_id = 3 )

df <- data.frame( x = 1:12, y = 1:12, z = 13:24, id = c(rep(1,6), rep(2,6)))
sfg_polygon( df, x = "x", y = "y" )
sfg_polygon( df, x = "x", y = "y", linestring_id = "id" )

sfg_polygon( df, linestring_id = "id" )

sfheaders documentation built on July 9, 2023, 7:41 p.m.