export to .asc or .grd files

Am 20.12.2010 18:02, schrieb Maxime Pauwels:

Hi list,

I'm using the sp package to grid data. I'd now like to export the grid 
in either .asc or .grd files. Does anyone can give me the package and 
function that does it easily?

Thanks,

max

Hi Max,

library(raster); use with function: writeRaster("raster object", "name", 
format="ascii"); format="raster" for *.grd files

library(rgdal); use with function: writeGDAL("rgdal object", 
fname="name", drivername="AAIGrid"); use gdalDrivers() to identify your 
preferred drivername for *.grd

you certainly have to change your grid object to a raster object when 
using raster package.

All the best!

Carsten

Hi Carsten,

Thanks for your help. I never used rgdal before and therefore do not 
understand what drivername is.
When I try your proposition, I ve got the following error message:

Error in .local(.Object, ...) :
         GDAL Error 6: GDALDriver::Create() ... no create method 
implemented for this format.

Where am I wrong?

best regards,

max



Le 21/12/2010 12:21, Carsten Neumann a ?crit :

 Am 20.12.2010 18:02, schrieb Maxime Pauwels:

Hi list,

I'm using the sp package to grid data. I'd now like to export the 
grid in either .asc or .grd files. Does anyone can give me the 
package and function that does it easily?

Thanks,

max

Hi Max,

library(raster); use with function: writeRaster("raster object", 
"name", format="ascii"); format="raster" for *.grd files

library(rgdal); use with function: writeGDAL("rgdal object", 
fname="name", drivername="AAIGrid"); use gdalDrivers() to identify 
your preferred drivername for *.grd

you certainly have to change your grid object to a raster object when 
using raster package.

All the best!

Carsten

Maxime Pauwels
Researcher ID: http://www.researcherid.com/rid/A-1745-2009

Equipe G?n?tique&  ?volution de l'adaptation aux environnements pollu?s par les m?taux lourds
Laboratoire de G?n?tique et Evolution des Populations V?g?tales
FRE CNRS 3268
B?timent SN2
Universit? de Lille, USTL-Lille1
http://gepv.univ-lille1.fr
Tel  : +33 3 20 33 62 38
Fax  : +33 3 20 43 69 79

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