[R-sig-Geo] Walruses and adehabitatHR: class estUDm exclusion of non-habitat pixels and summary over all animals

[Anthony Fischbach]

Dear Clement, 

Thank you so much for your elegant reply.
Your code worked well with my walrus data.

To complete the analysis I wish to extract kernel density contours for each
animal
and over all animals in the study.

Is there a means to convert the SpatialPixelDataFrame back into an estUDm?
Is there a means to extract a single set of contours across animals within
the estUDm?

Best Regards, 
Anthony

(My apologies, but the first question above is essentially the same as that
posed by Andrew on 2 August
[http://r-sig-geo.2731867.n2.nabble.com/conversion-of-ascii-grid-or-SpatialPixelsDataFrame-to-adehabitatHR-estUD-class-tp6645600p6645600.html])

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Tony Fischbach, Wildlife Biologist
Walrus Research Program
Alaska Science Center
U.S. Geological Survey
4210 University Drive
Anchorage, AK 99508-4650

AFischbach at usgs.gov
http://alaska.usgs.gov/science/biology/walrus
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