These filters are easy to implement and are available in contributed R
packages, but they are not very good. When you say "satellite"do you mean
Argos or GPS?

Argos recently updated their proprietary algorithms to give better
estimates but it it is still a rather black box.To me the issue is about
whether location accuracy of point samples or inference from derived
metrics of location are more important.


Both are very complicated and subject to active research.

I can help you implement these filters but am very loathe to if it it is
not for comparison-only purposes.

The adehabitat family of packages has very modern methods of deriving
metrics from track data.

Cheers, Mike


On Tuesday, November 8, 2011, Anthony Fischbach <afischbach@usgs.gov> wrote:
> Satellite data collection has revolutionized our understanding of animal
> movmement.
> Many relocations obtained by satellite data collection suffer large
> inaccuracies and must be filtered.
> Carla Freitas has contributed an algorithm for filtering such tracking
data
> (http://cran.r-project.org/web/packages/argosfilter/).  For years we have
> used on an alternative algorithm written in SAS
> (http://alaska.usgs.gov/science/biology/spatial/douglas.html).  To better
> serve the wildlife tracking community, we wish to translate this Douglas
> algorithm from SAS and offer it as a function in the 'argosfilter' R
> package.
>
> For this translation effort we wish to contract help.
> Interested parties, please contact me directly.
>
> -----
> Tony Fischbach, Wildlife Biologist
> Walrus Research Program
> Alaska Science Center
> U.S. Geological Survey
> 4210 University Drive
> Anchorage, AK 99508-4650
>
> AFischbach@usgs.gov
> http://alaska.usgs.gov/science/biology/walrus
> --
> View this message in context:
http://r-sig-geo.2731867.n2.nabble.com/SAS-to-R-translation-help-wanted-tp6976543p6976543.html
> Sent from the R-sig-geo mailing list archive at Nabble.com.
>
> _______________________________________________
> R-sig-Geo mailing list
> R-sig-Geo@r-project.org
> https://stat.ethz.ch/mailman/listinfo/r-sig-geo
>

-- 
Michael Sumner
Institute for Marine and Antarctic Studies, University of Tasmania
Hobart, Australia
e-mail: mdsumner@gmail.com

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