spTransform() error : "load package rgdal for spTransform methods"
On Wed, 6 Aug 2014, Remi Genevest wrote:
Hi,
I am facing a recurrent problem associated with spTransform() function from
rgdal package.
While I try to change the CRS of a SpatialGrid, I get the following error :
Error in spTransform(grd, CRS("+init=epsg:3857")) :
load package rgdal for spTransform methods
Thanks for the example. You cannot use spTransform on SpatialGrid objects
- this is known as warping, and does not return a regular grid in general.
You can do:
grd<-spTransform(as(grd, "SpatialPoints"), CRS("+init=epsg:3857"))
but:
gridded(grd) <- TRUE
#suggested tolerance minimum: 0.223608
#Error in points2grid(points, tolerance, round) :
# dimension 2 : coordinate intervals are not constant
Try warping instead.
Hope this clarifies,
Roger
Does anybody know how to solve it? Here is my code :
library(rgdal)
# create the SpatialGrid
cc<-c(10,20)
cs<-c(0.1,0.1)
cd<-c(200,200)
grd<-GridTopology(cellcentre.offset=cc,cellsize=cs,cells.dim=cd)
grd<-SpatialGrid(grd)
# set the CRS :
proj4string(grd)<-CRS("+proj=longlat +datum=WGS84")
# transform the CRS :
grd<-spTransform(grd,CRS("+init=epsg:3857"))
Error in spTransform(grd, CRS("+init=epsg:3857")) :
load package rgdal for spTransform methods
###################################################### R info session sessionInfo()
R version 3.1.1 (2014-07-10) Platform: x86_64-pc-linux-gnu (64-bit) locale: [1] LC_CTYPE=en_GB.UTF-8 LC_NUMERIC=C LC_TIME=en_GB.UTF-8 LC_COLLATE=en_GB.UTF-8 LC_MONETARY=en_GB.UTF-8 [6] LC_MESSAGES=en_GB.UTF-8 LC_PAPER=en_GB.UTF-8 LC_NAME=C LC_ADDRESS=C LC_TELEPHONE=C [11] LC_MEASUREMENT=en_GB.UTF-8 LC_IDENTIFICATION=C attached base packages: [1] grid stats graphics grDevices utils datasets methods base other attached packages: [1] rgdal_0.8-16 raster_2.2-31 hexbin_1.26.3 lattice_0.20-29 sp_1.0-15 loaded via a namespace (and not attached): [1] colorspace_1.2-4 digest_0.6.4 ggplot2_1.0.0 gtable_0.1.2 MASS_7.3-33 munsell_0.4.2 plyr_1.8.1 proto_0.3-10 Rcpp_0.11.2 [10] reshape2_1.4 scales_0.2.4 stringr_0.6.2 tools_3.1.1 -- View this message in context: http://r-sig-geo.2731867.n2.nabble.com/spTransform-error-load-package-rgdal-for-spTransform-methods-tp7586877.html Sent from the R-sig-geo mailing list archive at Nabble.com.
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Roger Bivand Department of Economics, Norwegian School of Economics, Helleveien 30, N-5045 Bergen, Norway. voice: +47 55 95 93 55; fax +47 55 95 91 00 e-mail: Roger.Bivand at nhh.no