Converts an sf object to a data.frame
Arguments
- sf
sf object
- fill
logical indicating if the resulting data.frame should be filled with the data columns from the sf object. If
TRUE, each row of data will be replicated for every coordinate in every geometry.- unlist
string vector of columns to unlist. Each list element is equivalent to a row of the input object, and is expected to be the same length as the number of coordinates in the geometry.
Examples
df <- data.frame(
ml_id = c(1,1,1,1,1,1,1,1,1,2,2,2,2,2,2)
, l_id = c(1,1,1,2,2,2,3,3,3,1,1,1,2,2,2)
, x = rnorm(15)
, y = rnorm(15)
, z = rnorm(15)
, m = rnorm(15)
)
sf <- sf_polygon( obj = df, polygon_id = "ml_id", linestring_id = "l_id" )
df <- sf_to_df( sf )
## with associated data
sf$val1 <- c("a","b")
sf$val2 <- c(1L, 2L)
df <- sf_to_df( sf, fill = TRUE )
## Unlisting list columns
df <- data.frame(
l_id = c(1,1,1,2,2,2,3,3,3,3)
, x = rnorm(10)
, y = rnorm(10)
)
sf <- sf_linestring( obj = df, linestring_id = "l_id" , x = "x", y = "y")
## put on a list column
sf$l <- list( c(1,2,3),c(3,2,1),c(10,11,12,13))
sf_to_df( sf, unlist = "l" )
#> sfg_id linestring_id x y l
#> 1 1 1 1.0628765 -0.6984294 1
#> 2 1 1 0.8130582 -0.9604492 2
#> 3 1 1 1.8034834 -0.9754230 3
#> 4 2 2 -0.1050687 -0.3385765 3
#> 5 2 2 0.9824534 1.1523471 2
#> 6 2 2 -1.7133026 0.4051012 1
#> 7 3 3 -0.8320195 -0.4709225 10
#> 8 3 3 1.1004919 -0.1332510 11
#> 9 3 3 -0.1738201 1.2266824 12
#> 10 3 3 0.1788120 0.3329440 13