On Jan 8, 2010, at 12:20 PM, Karl Ove Hufthammer wrote: > On Fri, 8 Jan 2010 10:11:20 +0100 Hans-Jörg Bibiko <bib...@eva.mpg.de> > wrote: >> I've a tiny question. Is there an annotated river dataset available? >> By 'annotated' I mean that rivers are ranked by a sort of >> relevance/size/length or whatever. The problem is that I have an huge >> SpatialLines object called 'rivers' which shows ~23200 rivers but I >> have to draw a map which only shows the most largest ones (let's say >> 100 to 150) plus one to three rivers for a country. > > How about using the 'SpatialLinesLengths' function? Try get the 100 > largest rivers, you can use
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. I thought that there's a good representative collection of the world's rivers available. Anyway, thanks a lot. --Hans _______________________________________________ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo
