Problem of overlapping between the “raster” and “adehabitatHR” libraries

[bouderb...@gmail.com]

Hello all, 

I want to compare the results of two methods for the selection of the background data “buffer” and “minimum convex polygon (MCP)”. I use for the buffer the “raster” library and the “adehabitatHR” library for "MCP". The problem is I got this error message :

 library(raster) 

library(adehabitatHR)

 library(adehabitatMA)

 r <- raster(ncol=36,nrow=18) 

values(r) <- NA r[500] <- 1 

b <- buffer(r, 500000) 

c<- buffer(r, width=500000) 

I got two errors : 

1/ If I use "width" argument (buffer(r, width=500000)), I get : Error in buffer(r, width = 5e+05) : unused argument (width = 5e+05) 

2/ and if I use buffer(r, 500000) I get this error : Error in buffer(r, 5e+05) : x should inherit the class SpatialPixels 

How can I overcome this problem ? 

Thank you in advance 

Regards 

[Bede-Fazekas Ákos]

Hello,

both 'raster' and 'adehabitatHR' have their own buffer() function. When you run library(adehabitatHR) you get some infos on the screen, including:
"The following object is masked from ‘package:raster’:
    buffer"
This means that when you call buffer(), R will call the buffer() function of adehabitatHR package, instead of that of the raster package.
There are three workarounds, I recommend no. 1:
1) Instead of buffer(), call raster::buffer()
2) Change the order of library(raster) and library(adehabitatHR)
3) Call library(adehabitatHR) after buffering.

HTH,
Ákos Bede-Fazekas
Hungarian Academy of Sciences

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[bouderb...@gmail.com]

Dear Ákos Bede-Fazekas, 

Thank you very much for your help it works with the option N°1. 

Please the width of the buffer represents the radius or the diameter of the buffer ? Because I can't find a detailed documentation. 

 

[Bede-Fazekas Ákos]

Hello,
radius, I think.
Best,
Ákos

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