[Biomod-commits] Extracting values from a raster

[Wilfried Thuiller]

Because you need to use the raster function to load the raster and not the readAsciiGrid. 

muestra = raster("cld6190_ann.asc")

loc = read.csv(file="bradypus.csv",head=TRUE,sep=",")
loca = loc[,2:3]

df = xyValues(muestra, loca)

The xyValues function works with raster object only




Le 9 sept. 2010 à 05:13, Manuel Spínola a écrit :

> Dear list members,
> 
> I am trying to use xyValues to extract values from a raster file:
> 
> muestra = readAsciiGrid("cld6190_ann.asc")
> 
> loc = read.csv(file="bradypus.csv",head=TRUE,sep=",")
> loca = loc[,2:3]
> 
> df = xyValues(muestra, loca)
> Error en function (classes, fdef, mtable)  :
>  unable to find an inherited method for function "xyValues", for signature "SpatialGridDataFrame", "data.frame"
> 
> Why did I get the error message?
> 
> Best,
> 
> Manuel
> 
> -- 
> Manuel Spínola, Ph.D.
> Instituto Internacional en Conservación y Manejo de Vida Silvestre
> Universidad Nacional
> Apartado 1350-3000
> Heredia
> COSTA RICA
> mspinola at una.ac.cr
> mspinola10 at gmail.com
> Teléfono: (506) 2277-3598
> Fax: (506) 2237-7036
> 
> _______________________________________________
> Biomod-commits mailing list
> Biomod-commits at lists.r-forge.r-project.org
> https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/biomod-commits

--------------------------
Dr. Wilfried Thuiller
Laboratoire d'Ecologie Alpine, UMR CNRS 5553
Université Joseph Fourier
BP53, 38041 Grenoble cedex 9, France
tel: +33 (0)4 76 51 44 97
fax: +33 (0)4 76 51 42 79

Email: wilfried.thuiller at ujf-grenoble.fr
Home page: http://www.will.chez-alice.fr
Website: http://www-leca.ujf-grenoble.fr/equipes/tde.htm

FP6 European MACIS project: http://www.macis-project.net
FP6 European EcoChange project: http://www.ecochange-project.eu





-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.r-forge.r-project.org/pipermail/biomod-commits/attachments/20100909/457095e7/attachment.htm>