[R-sig-Geo] can't find the function of GE_SpatialGrid

[Roger Bivand]

On Thu, 29 Mar 2007, Yong Li wrote:

> Dear all,
> 
> The following is the code I try to build grid from polygons, but was
> hammered by the error in the subject. Any idea helps me.

sessionInfo() ?

What is the version of your maptools package - the function you are 
looking for has only been present since 0.6-7.

By the way, GE_SpatialGrid() will not accept an input object which is not 
in geographical coordinates, and yours is projected, but this is not the 
problem you state here.

Roger

> 
> Yong
> 
> setwd("d:/Rcode/0_Zone")
> library(maptools)
> 
> xx <- readShapePoly("Newshape.shp", IDvar="ID",
>                     proj4string=CRS("+proj=tmerc
>                                     +lat_0=0
>                                     +lon_0=111
>                                     +k    =1.000000
>                                     +x_0  =500000
>                                     +y_0  =0
>                                     +ellps=krass
>                                     +units =m
>                                     +no_defs"))
> 
> plot(xx, col="red")
> 
> grd <- GE_SpatialGrid(xx, asp=1, maxPixels=100)$SG
> 
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> 

-- 
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no