On 23/07/16 05:00, Bacou, Melanie wrote:
Thanks! I wonder why the original syntax passing a list used to work (I
believe).
It shouldn't have worked:
rbind(list(1,2,3))
[,1] [,2] [,3]
[1,] 1 2 3
rbind(1,2,3)
[,1]
[1,] 1
[2,] 2
[3,] 3
For a much longer (and unknown) list of SpatialPolygonsDataFrames could
an approach using do.call() work instead? I tried but:
> m <- do.call(rbind, m, makeUniqueIDs=T)
Error in do.call(rbind, m, makeUniqueIDs = T) :
unused argument (makeUniqueIDs = T)
See Rolf's email for the correct way of using do.call; with sp from CRAN
it still doesn't work. As an alternative to installing sp from github
directly, you could source the relevant rbind methods from github in
your script:
rbind.SpatialPolygons = function(..., makeUniqueIDs = FALSE) {
dots = list(...)
names(dots) <- NULL
stopifnot(identicalCRS(dots))
# checkIDSclash(dots)
pl = do.call(c, lapply(dots, function(x) slot(x, "polygons")))
if (makeUniqueIDs)
pl = makeUniqueIDs(pl)
SpatialPolygons(pl, proj4string = CRS(proj4string(dots[[1]])))
}
rbind.SpatialPolygonsDataFrame <- function(..., makeUniqueIDs = TRUE) {
dots = list(...)
names(dots) <- NULL # bugfix Clement Calenge 100417
lst = lapply(dots, function(x) as(x, "SpatialPolygons"))
lst$makeUniqueIDs = makeUniqueIDs
pl = do.call(rbind.SpatialPolygons, lst)
df = do.call(rbind, lapply(dots, function(x) x@data))
SpatialPolygonsDataFrame(pl, df, match.ID = FALSE)
}
# This works though but takes an extra step
> spChFIDs(m[[1]]) <- paste0("A", seq(length(m[[1]])))
> spChFIDs(m[[2]]) <- paste0("B", seq(length(m[[2]])))
> spChFIDs(m[[3]]) <- paste0("C", seq(length(m[[3]])))
> m <- do.call(rbind, m)
> class(m)
[1] "SpatialPolygonsDataFrame"
attr(,"package")
[1] "sp"
--Mel.
On 7/22/2016 5:53 PM, Edzer Pebesma wrote:
The correct call to rbind would be
mm = rbind(m[[1]], m[[2]], m[[3]], makeUniqueIDs=T)
with sp on CRAN this doesn't work; with the version on github it does.
An alternative with sp from CRAN is to make the IDs unique by hand:
spChFIDs(m[[1]]) <- paste0("A", seq(length(m[[1]])))
spChFIDs(m[[2]]) <- paste0("B", seq(length(m[[2]])))
spChFIDs(m[[3]]) <- paste0("C", seq(length(m[[3]])))
mm = rbind(m[[1]], m[[2]], m[[3]])
On 22/07/16 22:55, Bacou, Melanie wrote:
Hi,
I'm getting weird results trying to rbind a list of
SpatialPolygonsDataFrames with R 3.2.1 and raster 2.5.8. I believe the
code below used to merge all 3 country boundaries, but instead I now get
a list with 6 elements (incl. 3 logical TRUE). Am I doing something wrong?
Thx, --Mel.
library(raster)
m <- lapply(c("TZA", "UGA", "GHA"), function(x) getData("GADM",
country=x, level=1))
m <- rbind(m, makeUniqueIDs=T)
sapply(m, class)
[1] "SpatialPolygonsDataFrame" "logical" "SpatialPolygonsDataFrame"
[4] "logical" "SpatialPolygonsDataFrame" "logical"
sessionInfo()
R version 3.2.1 (2015-06-18)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 7 x64 (build 7601) Service Pack 1
locale:
[1] LC_COLLATE=English_United States.1252 LC_CTYPE=English_United
States.1252
[3] LC_MONETARY=English_United States.1252 LC_NUMERIC=C
[5] LC_TIME=English_United States.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] raster_2.5-8 sp_1.2-3 rj_2.0.5-2
loaded via a namespace (and not attached):
[1] rj.gd_2.0.0-1 Rcpp_0.12.6 grid_3.2.1 lattice_0.20-33
_______________________________________________
R-sig-Geo mailing list
R-sig-Geo@r-project.org
https://stat.ethz.ch/mailman/listinfo/r-sig-geo
[[alternative HTML version deleted]]
_______________________________________________
R-sig-Geo mailing list
R-sig-Geo@r-project.org
https://stat.ethz.ch/mailman/listinfo/r-sig-geo
_______________________________________________
R-sig-Geo mailing list
R-sig-Geo@r-project.org
https://stat.ethz.ch/mailman/listinfo/r-sig-geo
