Hi Clément, Thank you for the help.
Like you said, I want to use the function mcp to estimate home-range sizes. I managed to convert my coordinates from Lat/Long to UTM (I guess this is what I needed to do). However, when I try to use the package you suggested (proj4) to convert to UTM I get an error back. Here is a little snippet of the error I am getting when I am trying to convert my data: # x is a list with my Lat/Long coordinates > x $Lat [1] -45.85599 -45.85800 -45.85719 -45.85709 -45.85684 -45.85712 -45.85916 -45.85695 [9] -45.85774 -45.85767 $Long [1] 170.51921 170.51944 170.51782 170.51785 170.51799 170.51772 170.51936 170.51814 [9] 170.51781 170.51765 > str(x) List of 2 $ Lat : num [1:10] -45.9 -45.9 -45.9 -45.9 -45.9 ... $ Long: num [1:10] 171 171 171 171 171 ... > s <- project(x, "+proj=tmerc") Error in project(x, "+proj=tmerc") : latitude or longitude exceeded limits Any ideas why I am getting this error back? Again, thanks a lot for your help. Eduardo Eduardo S. A. Santos ------------------------------------------------ PhD student http://sparrow.otago.ac.nz/ Department of Zoology University of Otago 340 Great King St. P.O. Box 56 Dunedin, New Zealand 2011/6/29 Clément Calenge <[email protected]> > Dear Eduardo, > > > > >> I am new to using adehabitatHR. I have a very simple question that neither >> the vignette of adehabitatHR nor Google could answer, so may you can help. I >> want to estimate home ranges using the function mcp. My data consists of >> individual ids and their locations in a Lat + Long format in a .csv file, as >> follows: >> >> ID Lat Long >> X 45.85711 170.51833 >> ... >> >> The question is: Do I have to convert my Lat/Long coordinates to another >> metric to estimate home ranges using mcp? If so, how do I proceed? >> > > Depending on your needs, you may have to convert your coordinates to > another system or not. If you just need to calculate the coordinates of the > vertices of the MCP (e.g. for habitat analyses, i.e. just to identify the > places of your study area located in the home range of an animal), you do > not have to convert your coordinates. On the other hand, if you plan to use > the home-range size calculated by this function, you have to (see the > arguments unin and unout on the help page of the function mcp: the units of > the coordinates should be in meters or kilometers; not decimal degrees). > To change the projection system, you can have a look at the package proj4 > in R or to try to do this with a GIS. > HTH, > > Clément Calenge > > -- > Clément CALENGE > Cellule d'appui à l'analyse de données > Direction des Etudes et de la Recherche > Office national de la chasse et de la faune sauvage > Saint Benoist - 78610 Auffargis > tel. (33) 01.30.46.54.14 > >
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