[R-sig-eco] from estUD to SpatialGridDataFrame in adehabitatMA

[Sebastian P. Luque]

On Fri, 23 Mar 2012 16:37:42 +0100,
Clement Calenge <clement.calenge-65xOkShCj2YVnxGAtMSvJw at public.gmane.org> wrote:

> Hi, Please consider this example:


>> ## Load the data data(puechabonsp) loc <- puechabonsp$relocs ##
>> Estimation of UD for the four animals (ud <- kernelUD(loc[,1]))
> ********** Utilization distribution of several Animals ************

> Type: probability density Smoothing parameter estimated with a href
> smoothing parameter This object is a list with one component per
> animal.  Each component is an object of class estUD See estUD-class
> for more information


> As indicated, the result is a list with one estUD per animal. See for
> example the first element:


>> ud[[1]]
> ********** Utilization distribution of an Animal ************

> Type: probability density Smoothing parameter estimated with a href
> parameter This object inherits from the class SpatialPixelsDataFrame.
> See estUD-class for more information

> As indicated, this object already inherits the class
> SpatialPixelsDataFrame. So that all functions requiring a
> SpatialPixelsDataFrame can take this object as argument. No need for
> coercion:

>> inherits(ud[[1]], "SpatialPixelsDataFrame")
> [1] TRUE

Thanks Clement, it's great to have all adehabitat objects inheriting
from sp classes.

Ultimately, I need to export the objects to Arc/Info ASCII Grid format,
which can be achieved by using the Gdal AAIGrid driver, via the rgdal
package.  This fails in my system (using your ud object above):

---<--------------------cut here---------------start------------------->---
library(rgdal)
locs.gtiff <- create2GDAL(ud[[1]],
                          drivername="GTiff")
locs.aaigrid <- copyDataset(locs.gtiff,
                            driver="AAIGrid")
saveDataset(locs.aaigrid, "~/tmp/test.asc")
---<--------------------cut here---------------end--------------------->---

Returns this:

Error in .local(.Object, ...) : Dataset copy failed

---<--------------------cut here---------------start------------------->---
R> sessionInfo()
R version 2.15.0 beta (2012-03-16 r58769)
Platform: x86_64-pc-linux-gnu (64-bit)

locale:
 [1] LC_CTYPE=en_CA.UTF-8       LC_NUMERIC=C               LC_TIME=en_CA.UTF-8       
 [4] LC_COLLATE=en_CA.UTF-8     LC_MONETARY=en_CA.UTF-8    LC_MESSAGES=en_CA.UTF-8   
 [7] LC_PAPER=C                 LC_NAME=C                  LC_ADDRESS=C              
[10] LC_TELEPHONE=C             LC_MEASUREMENT=en_CA.UTF-8 LC_IDENTIFICATION=C       

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
 [1] rgdal_0.7-8         adehabitatHR_0.3.4  adehabitatLT_0.3.4  CircStats_0.2-4    
 [5] boot_1.3-4          MASS_7.3-17         adehabitatMA_0.3.3  ade4_1.4-17        
 [9] rgeos_0.2-5         stringr_0.6         deldir_0.0-16       sp_0.9-97          
[13] latticeExtra_0.6-19 RColorBrewer_1.0-5  lattice_0.20-6     

loaded via a namespace (and not attached):
[1] grid_2.15.0  plyr_1.7.1   tools_2.15.0
---<--------------------cut here---------------end--------------------->---


-- 
Seb