sf_to_df {sfheaders}

sf to df

Description

Converts an sf object to a data.frame

Usage

sf_to_df(sf, fill = FALSE, unlist = NULL)

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" )