Hi
I am using adehabitat to calculate first passage time (fpt) for a series of GPS
locations at a specific date and time.
When I use as.ltraj to workout trajectories the output I get for each data
point looks like this:
x y date
dx dy dist dt R2n abs.angle rel.angle
-6.070993 51.59435 2006-06-17 15:03:04 NA NA NA NA 0 NA
102 NA
When I use fpt I get a series of NA for all points and I'm guessing this is to
do with the NAs for dx/dy/dt from ltraj. Does anyone know what may be causing
this error?
The full code is below
Thanks!
Sam
FOR LTRAJ
str(dddate)
dddate<-as.character(dddate)
str(dddate)
tttime<-as.character(tttime)
datetime<-paste(dddate, tttime)
ddate <- as.POSIXct(datetime)
xy<-data.frame (x, y)
id<-data.frame (FPT[,5])
xy<-data.frame (FPT[,4], FPT[,3])
yaya<-as.ltraj(xy,ddate,id, burst, typeII = TRUE, slsp = c("remove", "missing"))
FOR FPT
fptyaya=fpt(yaya, seq(300,1000,length=30))
Dr Samantha Patrick
EU INTERREG Post Doc
Marine Biology & Ecology Research Centre
University of Plymouth
Plymouth
PL4 8AA
T: 01752 584699
M: 07740472719
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