Thanks Hans,

Its been a day or so since I have used R graphics.
Now sp seems to lack grid. I cannot run my tried and
true graphics workspace at all.

Are you folks having any trouble? What am I doing
wrong?

Below
1. try to load library sp. No go.
2. download sp from Berkeley (US1). Different errors

 > library(sp)
Error : package 'grid' does not have a name space
Error: package/namespace load failed for 'sp'
 > chooseCRANmirror()
 > utils:::menuInstallPkgs()
trying URL 
'http://cran.cnr.Berkeley.edu/bin/windows/contrib/2.8/sp_0.9-29.zip'
Content type 'application/zip' length 845890 bytes (826 Kb)
opened URL
downloaded 826 Kb

package 'sp' successfully unpacked and MD5 sums checked

The downloaded packages are in
        C:\Documents and Settings\Jim Burke\Local 
Settings\Temp\RtmpqCMAZS\downloaded_packages
updating HTML package descriptions
Warning message:
dependency 'grid' is not available
 >

Thanks,
Jim Burke



Hans-Jörg Bibiko wrote:
> On 29.01.2009, at 16:49, Jonathan Callahan wrote:
>> Is anyone aware of an even more simplified version of the data that went
>> into creating TM_WORLD_BORDERS_SIMPL-0.2.RData so that we might have
>> TM_WORLD_BORDERS_LOWRES.RData for use cases like my own.
>
> A very quick solution would be to filter out all irrelevant small 
> polygons (islands).
> [to reduce the number of polygon points would lead to very unshaped 
> boundaries, I mean]
>
> What is an irrelevant polygon? My first approach is if a country 
> consists of more than 2 polygons then draw only those which are 
> greater than a given area let's say 0.1 .
>
> To achieve that without recreating the entire SpatialPolygonsDataFrame 
> one could simply change the plotOrder of each PolygonsList and save it.
>
> Like that quick&dirty script:
>
> library("maptools")
> load(url("http://spatial.nhh.no/R/etc/TM_WORLD_BORDERS_SIMPL-0.2.RData"))
> wrld_simpl <- wrld_simpl[wrld_simpl$NAME != "Antarctica",]
> for (i in (1:length(wrld_simpl@polygons))) {
>   polyCnt <- length(wrld_simpl@polygons[[i]]@Polygons)
>   if(polyCnt > 2) {
>     pO <- sapply(wrld_simpl@polygons[[i]]@Polygons, function(x) 
> {slot(x,'area')>0.1})
>     new_pO <- pO[ wrld_simpl@polygons[[i]]@plotOrder ]
>     wrld_simpl@polygons[[i]]@plotOrder <- 
> wrld_simpl@polygons[[i]]@plotOrder[ new_pO ]
>   }
> }
> save(wrld_simpl,'SIMPLEMAP.Rdata')
>
>
>
> --Hans
>
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>
>


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