[tlocoh-info] Error message creating locoh-xy object

[Andy Lyons]

Hi Elikana,

Based on your code, it would seem the coordinates for your individuals 
are saved in FRAcoordinates. Hence try:

FRA.lxy <- xyt.lxy(xy=FRAcoordinates, dt=FRA.localtime, 
id="FRA",proj4string=CRS("+proj=utm +south +zone=36 +ellps=WGS84"))

If you still get the error message, email me back and I'll help you 
diagnose the error.

Cheers,

Andy




On 2/15/2015 6:04 PM, elikana kalumanga wrote:
>  Hi people,
>
> I am at the very initial stages of learning tlocoh so that I 
> can estimate home ranges and calculate revisitation rate of elephants. 
> While creating an xyt.lxy object, I constantly receive error message; 
> *Error in min(xy[, 1]) : invalid 'type' (S4) of argument. *I will be 
> happy to know what is going wrong with my code?
>
> Thanks, and here are my codes:
>
>
> > head(FRAcoordinates)
>          x       y
> 0 386924.1 9369662
> 1 387761.6 9369931
>
> > head(as.character(FRA$Date_))
> [1] "2012-08-31 20:09:00.000" "2012-08-31 16:09:00.000" "2012-08-31 
> 12:09:00.000"
> [4] "2012-08-31 8:10:00.000"  "2012-08-31 4:09:00.000" "2012-08-31 
> 0:11:00.000"
>
> > FRA.localtime[1:3]
> [1] "2012-08-31 23:09:00 EAT" "2012-08-31 19:09:00 EAT" "2012-08-31 
> 15:09:00 EAT"
>
> >FRA.lxy <- xyt.lxy(xy=FRA, dt=FRA.localtime, 
> id="FRA",proj4string=CRS("+proj=utm +south +zone=36 +ellps=WGS84"))
> *Error in min(xy[, 1]) : invalid 'type' (S4) of argument
> *
>
> /Elikana
> University of Dar es Salaam-Tanzania
>
>
> On Wednesday, February 11, 2015 7:33 PM, Andy Lyons 
> <lyons.andy at gmail.com> wrote:
>
>
> Hi Julia,
>
> That's a good question. It seems you need a way to identify hulls that 
> belong to specific sites, and save the site location as an ancillary 
> variable (which can then serve as a hull metric). There isn't a 
> function currently in the package that can classify points or hulls 
> based on their location in space, but we could develop one because I 
> think this would have general utility.
>
> How specifically would you want to assign points / hulls to sites? One 
> option for defining a site would be with a polygon, either by drawing 
> one on the plot window or bringing in a shapefile. Another option 
> would be defining a site based on distance from a given location 
> (i.e., a circle). After defining the site, would you want to say that 
> any point (and thus the hull for that point) that falls within the 
> site? Or would you only want hulls whose entire area falls within the 
> site?
>
> Comment from other people welcome also.
>
> Thanks.
>
> Andy
>
>
>>
>>> On Feb 11, 2015, at 5:53 AM, Julia Krejci <julia.krejci at chello.at 
>>> <mailto:julia.krejci at chello.at>> wrote:
>>>
>>> Dear Mailinglist,
>>> I’m currently trying to compare hull metrics (nsv and mnlv) of 
>>> several individuals and several sites. I want to know how long and 
>>> how often individual A visited site 1 and 2 and the same for 
>>> individual B. Is there a way to get more accurate values for 
>>> specific sites than I can receive from the images? Currently I have 
>>> just plotted the hpp with the respective colour code and try to 
>>> compare colours but of course that’s not very accurate, also because 
>>> the colours only represent ranges of values (like, yellow is 1 – 12, 
>>> orange is 12 – 24 and so on).
>>> Thank you for every advice!
>>> Best wishes,
>>> Julia
>>> _______________________________________________
>>> Tlocoh-info mailing list
>>> Tlocoh-info at lists.r-forge.r-project.org 
>>> <mailto:Tlocoh-info at lists.r-forge.r-project.org>
>>> http://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/tlocoh-info
>>
>
>
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>

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