[R-sig-Geo] Determine angle between polyline segments

[Rainer M Krug]

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Thanks a lot Nikhil

The functions seem to do what I need, but I am looking into the package
adehabitat as suggested by Mathieu and it seems to be ideal for the purpose.

Thanks a lot,
Rainer


On 30/07/10 17:22, Mathieu Basille wrote:
> Hello,
> 
> Have you considered using the 'adehabitat' package? It presents classes
> and tools for the analysis of trajectories, and automagically computes
> absolute and relative angles. I'm not that familiar with polylines (in
> ArcGIS or sp) so that I don't have a working example at hand, but you'd
> have to extract coordinates of the polylines to build a ltraj object
> (using as.ltraj), keeping the ID of the line as the ID of the ltraj, and
> with 'typeII = FALSE' which means that you don't have the exact date.
> 
> In the end, an object of class ltraj is a list with a data frame for
> each element of the list (for you a line), which gives you both kind of
> angles among other variables (dx, dy, dist, etc.).
> 
> Hope this helps,
> Mathieu.
> 
> 
> Le 30/07/2010 03:33, Rainer M Krug a écrit :
> Hi
> 
> a friend of mine wants (needs?) to determine the angle between segments
> in an ESRI polyline (line vector feature). As there does not seem to be
> an easy way in ArcGIS 9.2, I thought about askeng here:
> 
> Is there way of calculating these angles between the different line
> segments in R (after importing the line feature into R)?
> 
> Thanks,
> 
> Rainer
> 
>>
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Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation
Biology, UCT), Dipl. Phys. (Germany)

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