sfg point

constructs sfg POINT object

sfg_point(obj, x = NULL, y = NULL, z = NULL, m = NULL)

Arguments

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

Value

sfg object of POINT geometry

Examples

sfg_point( 1:2 )
#> [1] 1 2
#> attr(,"class")
#> [1] "XY"    "POINT" "sfg"  
sfg_point( 1:3 )
#> [1] 1 2 3
#> attr(,"class")
#> [1] "XYZ"   "POINT" "sfg"  
sfg_point( 1:4 )
#> [1] 1 2 3 4
#> attr(,"class")
#> [1] "XYZM"  "POINT" "sfg"  

sfg_point( matrix( 1:3, ncol = 3 ) )
#> [1] 1 2 3
#> attr(,"class")
#> [1] "XYZ"   "POINT" "sfg"  
sfg_point( data.frame( x = 1, y = 2, z = 3 )  )
#> [1] 1 2 3
#> attr(,"class")
#> [1] "XYZ"   "POINT" "sfg"  

sfg_point( data.frame( x = 1, y = 2, z = 3 ), x = "x", y = "y" )
#> [1] 1 2
#> attr(,"class")
#> [1] "XY"    "POINT" "sfg"  
sfg_point( data.frame( x = 1, y = 2, z = 3 ), x = 1, y = 3  )
#> [1] 1 3
#> attr(,"class")
#> [1] "XY"    "POINT" "sfg"