[tlocoh-info] Query on radio telemetry data

Andy Lyons lyons.andy at gmail.com
Tue Mar 3 07:43:22 CET 2015

Hi Bruce,

Unfortunately tlocoh doesn't have functions to triangulate radio fixes 
to estimate the tag location. I don't know of any R packages that can do 
this (although it's not something I've ever really looked for). There 
may be a QGIS plug-in that can do this: 

You could also consider subscribing to the Animove discussion list and 
posting a question there. See http://animove.org/contact/

Sorry I can't be more help, but good luck.


On 2/25/2015 9:18 AM, Bruce Miller wrote:
> Hi all,
> I tried unsuccessfully to use LOAS to derive predicted locations of 
> radio tagged bats.
> I have observer locations (X-Y)  and compass bearings (azimuths) to 
> the signals and need to derive estimated locations of each transmitter.
> The R based version of LOAS was allegedly to be ready last summer 
> (2014) but is not yet available.
> How can I best derive these points and export the points and potential 
> confidence ellipses either as shape files or even locations as simple 
> X-Y locations so I can map the bearings and estimated locations in a GIS?
> I need to re-read the tlocoh documentation, but does this package 
> provide this type of animal movement analyses?
> I am in the field and w/o my full GIS software on my office workstation.
> Data includes 16 nights of ground tracking teams and one plane with 2 
> receivers and antennas flying overhead.
> The Lotek receivers export the data files as logged TX freq. and 
> positions but only as WGS84 decimal degrees and the rest of the data 
> is based on UTM zone 11S northing and easting, as well as the planes 
> GPS track for flights.
> All include date-time stamps so linking in my master database is not 
> an issue.
> Any suggestions welcome.
> Bruce
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