[R-sig-Geo] Problem with SpatialPolygons.SpatialPixels object
Edzer Pebesma
edzer.pebesma at uni-muenster.de
Sun Mar 17 13:11:28 CET 2013
the function is no longer exported as function, but rather as coerce method:
gridPol <- as(gridPix, "SpatialPolygons")
will call this function. Calling the old function can be done with
gridPol <- sp:::as.SpatialPolygons.SpatialPixels(gridPix)
but is not recommended - names of unexported functions may change
without warning.
On 03/17/2013 12:54 PM, ASANTOS wrote:
> Dear list members,
>
> I'm trying to create a as.SpatialPolygons.SpatialPixels object with
> sp package, normally this function works, but I try to use without
> success, above a example in this list posted by Dr. Justiniano:
>
> ##
> require(sp)
> set.seed(12)
> xy <- cbind(runif(n=500,min=0, max=20),
> runif(n=500,min=0, max=20))
> ## points
> pontos <- SpatialPoints(xy)
> ## grid of "quadrats"
> ## i. as SpatialGrid
> grid <- SpatialGrid(grid = GridTopology(c(0.5,0.5), c(1,1), c(20,20)))
> ## ii. as SpatialPixels
> gridPix <- grid
> fullgrid(gridPix) <- FALSE
> ## iii. as SpatialPolygons
> gridPol <- as.SpatialPolygons.SpatialPixels(gridPix)
> #
> And my question is whats is happening with the
> as.SpatialPolygons.SpatialPixels() function?
>
> Thanks
>
--
Edzer Pebesma
Institute for Geoinformatics (ifgi), University of Münster
Weseler Straße 253, 48151 Münster, Germany. Phone: +49 251
8333081, Fax: +49 251 8339763 http://ifgi.uni-muenster.de
http://www.52north.org/geostatistics e.pebesma at wwu.de
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