[R] Help with Error Messages

Bert Gunter bgunter.4567 at gmail.com
Wed Dec 7 23:59:14 CET 2016

Well, have you looked to see what:


has to offer? And, if so, why did you not follow their advice to post
on the r-sig-geo list; if not, you should consider posting there
rather than here.


Bert Gunter

"The trouble with having an open mind is that people keep coming along
and sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )

On Wed, Dec 7, 2016 at 9:53 AM, Jackson Hooten <jlhooten at eckerd.edu> wrote:
> Hello everyone,
> I am new to R and need help with a project I am currently running. I am
> tracking about 24 great white sharks in Mossel Bay South Africa. I wish to
> summarize these sharks' movements in and around the bay. In order to do
> that I have a shapefile of a map that I wish to import into R and use as a
> base layer to show the movements of the sharks. I have been searching
> everywhere online, but cannot seem to find anything that can show me how to
> import such a shapefile. Any advise?
> On top of that, I also wish to do a kernel density estimation of these
> sharks' movements on the map. My data consists of "x" and "y" (Latitude and
> Longitude) coordinates of where the sharks pinged, the date, and their ID.
> So far, I have been able to figure out some codes that will get me what I
> need as far as the kernel density estimations go.
> Code example:
>> kud.href<-kernelUD(shark.sp[,"id"], h="href", hlim=c(0.01,0.5), grid=500,
> extent=0.1)
>> image(kud.href,col=rev(heat.colors(50)))
> However, whenever I run this code:
>> kud95<-getverticeshr(kud,percent=95)
> I get this error message:
> Error in getverticeshr.estUD(x[[i]], percent, ida = names(x)[i], unin,  :
>   The grid is too small to allow the estimation of home-range.
> You should rerun kernelUD with a larger extent parameter
> Could anyone advise me on how to solve this problem? I have already tried
> to increase the "grid" as well as the "extent parameter" but continuously
> get this same error message. I read online somewhere, that one could use
> the "SpatialPixels" function to solve the problem, but they never put an
> example up, so I have no idea how to apply it. Thank you so much for your
> patience and assistance.
> Sincerely,
> Jackson
>         [[alternative HTML version deleted]]
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