[R-sig-Geo] Rgshhs shift=true question

[Hans-Jörg Bibiko]

Hi,

I'm using the river database 'wdb_rivers_l.b' downloaded from ftp://ftp.soest.hawaii.edu/pwessel/gshhs/gshhs_1.11.zip 
.

If I do this:

 > rivers_low <- Rgshhs("wdb_rivers_l.b")

I get a list of rivers as SpatialLines with

 > bbox(rivers_low[[1]])
           min       max
r1   0.000278 359.99944
r2 -52.733333  74.41167

Fine.

But I need a xlim range of c(-180, 180). I could do it manually but I  
read in ?Rgshhs that there's an argument 'shift' which, set to TRUE,  
shifts longitudes > 180 degrees to below zero. But if I call:

 > rivers_low <- Rgshhs("wdb_rivers_l.b", shift = TRUE)

I get the same bbox.

What am I doing wrong?

Thanks in advance and kind regards,

--Hans