Is there an annotated river dataset available?

On Fri, 8 Jan 2010 13:25:24 +0100 Hans-J?rg Bibiko <bibiko at eva.mpg.de> 
wrote:

Thanks for the hint!
The absolute length can make sense of course but if I need also 
the largest rivers of a smaller island then this fails or it's much 
more tricky to handle/select.

Not really. You could for example use 'ddply' from the 'plyr' package 
to get the names/IDs of the longest rivers for each country/island/...
Then select the rivers with these names/IDs.

Karl Ove Hufthammer