st_erase_overlaps {wdpar}

Erase overlaps

Description

Erase overlapping geometries in a sf::sf() object.

Usage

st_erase_overlaps(x, verbose = FALSE)

Arguments

x

sf::sf() object.

verbose

logical should progress be reported? Defaults to FALSE.

Details

This is a more robust – albeit slower – implementation for sf::st_difference() when y is missing.

Value

sf::sf() object.

See Also

sf::st_difference(), wdpa_dissolve().

Examples

# create data
pl1 <- sf::st_polygon(list(matrix(c(0, 0, 2, 0, 1, 1, 0, 0), byrow = TRUE,
                                  ncol = 2))) * 100
pl2 <- sf::st_polygon(list(matrix(c(0, 0.5, 2, 0.5, 1, 1.5, 0, 0.5),
                                  byrow = TRUE, ncol = 2))) * 100
pl3 <- sf::st_polygon(list(matrix(c(0, 1.25, 2, 1.25, 1, 2.5, 0, 1.25),
                                  byrow = TRUE, ncol = 2))) * 100
x <- sf::st_sf(order = c("A", "B", "C"),
               geometry = sf::st_sfc(list(pl1, pl2, pl3), crs = 3395))

# erase overlaps
y <- st_erase_overlaps(x)

# plot data for visual comparison
par(mfrow = c(1, 2))
plot(sf::st_geometry(x), xlim = c(0, 200), ylim = c(0, 250),
     main = "original", col = "transparent")
plot(sf::st_geometry(y), , xlim = c(0, 200), ylim = c(0, 250),
     main = "no overlaps", col = "transparent")