Create simple feature from a numeric vector, matrix or list
Create simple feature from a numeric vector, matrix or list
st_point(x = c(NA_real_, NA_real_), dim = "XYZ") st_multipoint(x = matrix(numeric(0), 0, 2), dim = "XYZ") st_linestring(x = matrix(numeric(0), 0, 2), dim = "XYZ") st_polygon(x = list(), dim = if (length(x)) "XYZ" else "XY") st_multilinestring(x = list(), dim = if (length(x)) "XYZ" else "XY") st_multipolygon(x = list(), dim = if (length(x)) "XYZ" else "XY") st_geometrycollection(x = list(), dims = "XY") ## S3 method for class 'sfg' print(x, ..., width = 0) ## S3 method for class 'sfg' head(x, n = 10L, ...) ## S3 method for class 'sfg' format(x, ..., width = 30) ## S3 method for class 'sfg' c(..., recursive = FALSE, flatten = TRUE) ## S3 method for class 'sfg' as.matrix(x, ...)
x |
for |
dim |
character, indicating dimensions: "XY", "XYZ", "XYM", or "XYZM"; only really needed for three-dimensional points (which can be either XYZ or XYM) or empty geometries; see details |
dims |
character; specify dimensionality in case of an empty (NULL) geometrycollection, in which case |
... |
objects to be pasted together into a single simple feature |
width |
integer; number of characters to be printed (max 30; 0 means print everything) |
n |
integer; number of elements to be selected |
recursive |
logical; ignored |
flatten |
logical; if TRUE, try to simplify results; if FALSE, return geometrycollection containing all objects |
"XYZ" refers to coordinates where the third dimension represents altitude, "XYM" refers to three-dimensional coordinates where the third dimension refers to something else ("M" for measure); checking of the sanity of x may be only partial.
When flatten=TRUE, this method may merge points into a multipoint structure, and may not preserve order, and hence cannot be reverted. When given fish, it returns fish soup.
object of the same nature as x, but with appropriate class attribute set
as.matrix returns the set of points that form a geometry as a single matrix, where each point is a row; use unlist(x, recursive = FALSE) to get sets of matrices.
(p1 = st_point(c(1,2))) class(p1) st_bbox(p1) (p2 = st_point(c(1,2,3))) class(p2) (p3 = st_point(c(1,2,3), "XYM")) pts = matrix(1:10, , 2) (mp1 = st_multipoint(pts)) pts = matrix(1:15, , 3) (mp2 = st_multipoint(pts)) (mp3 = st_multipoint(pts, "XYM")) pts = matrix(1:20, , 4) (mp4 = st_multipoint(pts)) pts = matrix(1:10, , 2) (ls1 = st_linestring(pts)) pts = matrix(1:15, , 3) (ls2 = st_linestring(pts)) (ls3 = st_linestring(pts, "XYM")) pts = matrix(1:20, , 4) (ls4 = st_linestring(pts)) outer = matrix(c(0,0,10,0,10,10,0,10,0,0),ncol=2, byrow=TRUE) hole1 = matrix(c(1,1,1,2,2,2,2,1,1,1),ncol=2, byrow=TRUE) hole2 = matrix(c(5,5,5,6,6,6,6,5,5,5),ncol=2, byrow=TRUE) pts = list(outer, hole1, hole2) (ml1 = st_multilinestring(pts)) pts3 = lapply(pts, function(x) cbind(x, 0)) (ml2 = st_multilinestring(pts3)) (ml3 = st_multilinestring(pts3, "XYM")) pts4 = lapply(pts3, function(x) cbind(x, 0)) (ml4 = st_multilinestring(pts4)) outer = matrix(c(0,0,10,0,10,10,0,10,0,0),ncol=2, byrow=TRUE) hole1 = matrix(c(1,1,1,2,2,2,2,1,1,1),ncol=2, byrow=TRUE) hole2 = matrix(c(5,5,5,6,6,6,6,5,5,5),ncol=2, byrow=TRUE) pts = list(outer, hole1, hole2) (pl1 = st_polygon(pts)) pts3 = lapply(pts, function(x) cbind(x, 0)) (pl2 = st_polygon(pts3)) (pl3 = st_polygon(pts3, "XYM")) pts4 = lapply(pts3, function(x) cbind(x, 0)) (pl4 = st_polygon(pts4)) pol1 = list(outer, hole1, hole2) pol2 = list(outer + 12, hole1 + 12) pol3 = list(outer + 24) mp = list(pol1,pol2,pol3) (mp1 = st_multipolygon(mp)) pts3 = lapply(mp, function(x) lapply(x, function(y) cbind(y, 0))) (mp2 = st_multipolygon(pts3)) (mp3 = st_multipolygon(pts3, "XYM")) pts4 = lapply(mp2, function(x) lapply(x, function(y) cbind(y, 0))) (mp4 = st_multipolygon(pts4)) (gc = st_geometrycollection(list(p1, ls1, pl1, mp1))) st_geometrycollection() # empty geometry c(st_point(1:2), st_point(5:6)) c(st_point(1:2), st_multipoint(matrix(5:8,2))) c(st_multipoint(matrix(1:4,2)), st_multipoint(matrix(5:8,2))) c(st_linestring(matrix(1:6,3)), st_linestring(matrix(11:16,3))) c(st_multilinestring(list(matrix(1:6,3))), st_multilinestring(list(matrix(11:16,3)))) pl = list(rbind(c(0,0), c(1,0), c(1,1), c(0,1), c(0,0))) c(st_polygon(pl), st_polygon(pl)) c(st_polygon(pl), st_multipolygon(list(pl))) c(st_linestring(matrix(1:6,3)), st_point(1:2)) c(st_geometrycollection(list(st_point(1:2), st_linestring(matrix(1:6,3)))), st_geometrycollection(list(st_multilinestring(list(matrix(11:16,3)))))) c(st_geometrycollection(list(st_point(1:2), st_linestring(matrix(1:6,3)))), st_multilinestring(list(matrix(11:16,3))), st_point(5:6), st_geometrycollection(list(st_point(10:11))))
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