[R-sig-Geo] Is there an annotated river dataset available?

[Hans-Jörg Bibiko]

On Jan 8, 2010, at 2:29 PM, Karl Ove Hufthammer wrote:

> On Fri, 8 Jan 2010 13:25:24 +0100 Hans-Jörg 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.

Yes, but my dataset has no names or IDs and furthermore I've just encountered that my rivers are split into line segments :(
The only chance would be to combine these segments and select those rivers/lines which are inside of country/island polygons.

Thanks,

--Hans