Message-ID: <MPG.25b1519739d0af689896c8@news.gmane.org>
Date: 2010-01-08T13:29:12Z
From: Karl Ove Hufthammer
Subject: 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