[R-sig-Geo] spTransform to convert projected coords into geog coord

Robin W Hunnewell rhunne at mac.com
Thu Jul 14 19:50:42 CEST 2011


I get an error when calling function 'spTransform' -- from package {rgdal}. I've used spTransform recently w/ no problem, to convert coordinates from one CRS to coords of another. Has this function been deprecated, or is there some other method?  

My code below. I'll lean in for a dope slap if I've missed something simple! 
Thanks for any help.

> summary(pp)
Planar point pattern: 18 points
Average intensity 0.0928 points per square kilometer  

Window: polygonal boundary
single connected closed polygon with 7995 vertices
enclosing rectangle: [687.8542, 719.5667]x[4886.808, 4925.33]kilometer
Window area =  193.967 square kilometer 
Unit of length: 1 kilometer 
> pp.longlat <- spTransform(pp, CRS=CRS("+proj=longlat +ellps=WGS84"))
Error in function (classes, fdef, mtable)  : 
  unable to find an inherited method for function "spTransform", for signature "ppp", "CRS"

> sessionInfo()
R version 2.13.0 (2011-04-13)
Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit)

[1] en_US.UTF-8/en_US.UTF-8/C/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
 [1] rgeos_0.1-4         rgdal_0.6-33        gpclib_1.5-1        maptools_0.8-6      lattice_0.19-26    
 [6] foreign_0.8-44      spatstat_1.22-3     RandomFields_2.0.45 deldir_0.0-13       mgcv_1.7-6         
[11] raster_18-12       sp_0.9-80          

loaded via a namespace (and not attached):
[1] grid_2.13.0        Matrix_0.999375-50 nlme_3.1-101       tools_2.13.0   
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