Hi everyone,

 

I have estimated home range boundaries at a 95 % confidence level, using
kernels with the < biased cross-validation > smoothing parameter. The < kde
> function of the < ks > package has been used to do this. I am unable to
export the 95% contour line into a shapefile or something readable by
ArcGIS. Could someone help me?

 

This is an example of my R programming code :

 

windows(record=T)

library(ks)

 

#Example of relocation data

set.seed(60)

x<-rnorm(200, -460678, 643)

y<-rnorm(200, 597197, 1351)

xy<-cbind(x, y)

 

#Computation of the < Biased Cross-Validation > smoothing parameter

H<-Hbcv.diag(xy)

 

#Computation of the fixed kernel estimation

kd<-kde(xy, H=H, gridsize=100, compute.cont=F)

 

#Computation of 95% contour line

ligne<-contourLevels(kd, prob=c(0.50,0.75,0.95))

 

#Output of the 95% contour line

plot(kd, display="slice", cont=95, drawpoints=T)

 

Thank you!

 

Jean Lapointe

 

 


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