Hello,
I am trying to create a ltraj object to obtain first passage times (with the
aim to reveal stopover sites of migratory seabirds) using package adehabitat,
My code is:
require(adehabitat)
Xloc$Date <- paste( Xloc$date, Xloc$hm)
Xloc$Date <- as.POSIXct( Xloc$Date, format = "%d/%m/%Y %H:%M", tz = "GMT" )
xy <- Xloc[,c("lat","long")]
id= Xloc$ind
tr1 <- as.ltraj( xy, Xloc$Date, id )
F <- fpt(tr1, seq(300,1000, length=30))
plot(F, scale = 500, warn = FALSE)
However, I only obtain NAs. I think the problem lies in the format of the
coordinates. I'm using a decimal format but function fpt() apparently works
with UTM coordinates. How can I convert them into this format?
Here is a link to a dput() to file tr1.txt:
http://file-manager.000webhost.com/file-manager/index.php
Thank you for your help!
Santi_______________________________________________
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