R: jitter geometries

st_jitter {sf} | R Documentation

## jitter geometries

### Description

jitter geometries

### Usage

    st_jitter(x, amount, factor = 0.002)

### Arguments

`x` | object of class `sf` or `sfc`
`amount` | numeric; amount of jittering applied; if missing, the amount is set to factor * the bounding box diagonal; units of coordinates.
`factor` | numeric; fractional amount of jittering to be applied

### Details

jitters coordinates with an amount such that `runif(1, -amount, amount)` is added to the coordinates. x- and y-coordinates are jittered independently but all coordinates of a single geometry are jittered with the same amount, meaning that the geometry shape does not change. For longlat data, a latitude correction is made such that jittering in East and North directions are identical in distance in the center of the bounding box of `x`.

### Examples

    nc = read_sf(system.file("gpkg/nc.gpkg", package="sf"))
    pts = st_centroid(st_geometry(nc))
    plot(pts)
    plot(st_jitter(pts, .05), add = TRUE, col = 'red')
    plot(st_geometry(nc))
    plot(st_jitter(st_geometry(nc), factor = .01), add = TRUE, col = '#ff8888')

[Package sf version 0.9-7 Index]