[R-sig-eco] adehabitat and Lat Long data

[Mike]

Hi

I have ARGOS satellite tag data from some some very long distance traveling
sharks.  These
critters cover large chunks of the Atlantic; coordinates are in
decimal degrees.

It would love to apply the residenceTime function in the adehabitat package
to try and segment the paths into broad homogeneous bouts of movement (i.e.
migration, seasonal residence/feeding areas etc).  But as far as I can tell
from the documentation and the examples it seems that the data must be in
some sort of Cartesian coordinate system.  Conversion to UTM's wouldn't be
practical in
this case because the movement tracks encompass many UTM zones.  Is there
a way to do the residence time analysis in adehabitat using data in decimal
degrees that perhaps I am just missing?  

If not, does anybody have any code or recommendations for another way to go
about this?  Any insight appreciated!

Thanks 
-Mike 




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