st_make_grid: Create a regular tesselation over the bounding box of an sf...

Description Usage Arguments Value Examples

View source: R/geom.R

Description

Create a square or hexagonal grid over the bounding box of an sf or sfc object

Usage

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st_make_grid(x, cellsize = c(diff(st_bbox(x)[c(1, 3)]),
  diff(st_bbox(x)[c(2, 4)]))/n, offset = st_bbox(x)[c("xmin", "ymin")],
  n = c(10, 10), crs = if (missing(x)) NA_crs_ else st_crs(x),
  what = "polygons", square = TRUE)

Arguments

x

object of class sf or sfc

cellsize

target cellsize

offset

numeric of lengt 2; lower left corner coordinates (x, y) of the grid

n

integer of length 1 or 2, number of grid cells in x and y direction (columns, rows)

crs

object of class crs; coordinate reference system of the target of the target grid in case argument x is missing, if x is not missing, its crs is inherited.

what

character; one of: "polygons", "corners", or "centers"

square

logical; if FALSE, create hexagonal grid

Value

Object of class sfc (simple feature geometry list column) with, depending on what and square, square or hexagonal polygons, corner points of these polygons, or center points of these polygons.

Examples

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plot(st_make_grid(what = "centers"), axes = TRUE)
plot(st_make_grid(what = "corners"), add = TRUE, col = 'green', pch=3)
sfc = st_sfc(st_polygon(list(rbind(c(0,0), c(1,0), c(1,1), c(0,0)))))
plot(st_make_grid(sfc, cellsize = .1, square = FALSE))
plot(sfc, add = TRUE)
# non-default offset:
plot(st_make_grid(sfc, cellsize = .1, square = FALSE, offset = c(0, .05 / (sqrt(3)/2))))
plot(sfc, add = TRUE)

sf documentation built on July 24, 2019, 5:05 p.m.