[R-sig-Geo] problems loading spproj library for transform()

[Roger Bivand]

On Thu, 25 May 2006, Michael Sumner wrote:

> Hello
> 
> I have the same problem, I've been meaning to explore further before 
> posting, but since spproj is not on CRAN I don't think I've missed 
> something obvious. This seems to be related to rgdal 0.4-4:
> 

In rgdal, try running example("spTransform-methods") - if it works, use 
spTransform() instead of transform().

Sorry for the muddle.

Roger

> ## using data from ?project example
> 
> library(rgdal)
> 
> ## project works OK
>   data(state)
>   res <- project(cbind(state.center$x, state.center$y), "+proj=lcc 
> +lat_1=48 +lat_2=33 +lon_0=-100")
>   res1 <- project(res, "+proj=lcc +lat_1=48 +lat_2=33 +lon_0=-100", 
> inv=TRUE)
> 
> ## but transform does not
> 
> res <- SpatialPoints(res, CRS("+proj=lcc +lat_1=48 +lat_2=33 +lon_0=-100"))
> 
> sessionInfo()
> #Version 2.3.0 (2006-04-24)
> #i386-pc-mingw32
> 
> #attached base packages:
> #[1] "methods"   "stats"     "graphics"  "grDevices" "utils"     "datasets"
> #[7] "base"    
> 
> #other attached packages:
> #   rgdal   pixmap    abind       sp
> # "0.4-4"  "0.4-4"  "1.1-0" "0.8-14"
> 
> 
> transform(res, CRS("+proj=longlat"))
> #Loading required package: spproj
> #Error in transform(res, CRS("+proj=longlat")) :
> #        for using (coordinate) transform on objects deriving from 
> Spatial, library spproj is required
> #In addition: Warning message:
> #there is no package called 'spproj' in: library(package, lib.loc = 
> lib.loc, character.only = TRUE, logical = TRUE,
> 
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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