[R-sig-eco] location data format for adehabitat package

[Clement Calenge]

Dear Christian,

> I would like to perform some ecological niche factor analysis (ENFA)
> using the adehabitat package and am not too sure about the location
> data. Basically I have them as longitudes and latitudes at the moment
> but I could also generate then as 'tile index' (e.g. lower left corner
> has the latitude -90 and longitude -180 so the 'tile index' would be
> 0, 0 - right?). Which is the correct location data format?

The location data should be in the same coordinate system as the maps. 
Therefore, the locations should be expressed as longitude/latitudes.
HTH,

Clément Calenge

-- 
Clément CALENGE
Cellule d'appui à l'analyse de données
Direction des Etudes et de la Recherche
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tel. (33) 01.30.46.54.14