[R-sig-Geo] Saving a spatial point object into a shapefile

[Edzer Pebesma]

On 11/04/2010 11:16 AM, Manuel Spínola wrote:
> Dear list members,
> 
> I am trying to save a spatial point object as a shapefile, but I got an 
> error that I do not have the right object class, why?

Because the documentation sais so. ?writeOGR tells me:

Usage:

     writeOGR(obj, dsn, layer, driver, dataset_options = NULL,
layer_options=NULL, verbose = FALSE)

Arguments:

     obj: a SpatialPointsDataFrame, SpatialLinesDataFrame, or a
          SpatialPolygonsDataFrame object.
...

you can create a SpatialPointsDataFrame with dummy attributes from your
object by:

x = SpatialPointsDataFrame(sitiosMikeCRTM05, data.frame(dummy = rep(1,14))

> 
>  > sitiosMikeCRTM05
> SpatialPoints:
>               x       y
>   [1,] 480244.6 1181636
>   [2,] 480651.1 1184371
>   [3,] 477555.2 1181189
>   [4,] 486482.8 1167946
>   [5,] 483764.4 1164624
>   [6,] 477301.6 1192979
>   [7,] 483737.4 1192048
>   [8,] 480760.2 1192652
>   [9,] 479985.8 1150756
> [10,] 481748.5 1148902
> [11,] 476126.6 1165617
> [12,] 464735.7 1167079
> [13,] 481182.4 1185941
> [14,] 500632.8 1132727
> Coordinate Reference System (CRS) arguments: +proj=tmerc +lon_0=-84 
> +lat_0=0 +x_0=500000 +k=0.9999 +datum=WGS84 +ellps=WGS84 +towgs84=0,0,0
> 
>  > writeOGR(sitiosMikeCRTM05, 
> dsn="C:/ProyectosRespacial/CBSS/Shapefiles_proyectados", 
> layer="sitiosMikeCRTM05", driver="ESRI Shapefile")
> Error en writeOGR(sitiosMikeCRTM05, dsn = 
> "C:/ProyectosRespacial/CBSS/Shapefiles_proyectados",  :
>    obj of wrong class
> 
> Best,
> 
> Manuel
> 
> 
> 
> 
> 
> 
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-- 
Edzer Pebesma
Institute for Geoinformatics (ifgi), University of Münster
Weseler Straße 253, 48151 Münster, Germany. Phone: +49 251
8333081, Fax: +49 251 8339763  http://ifgi.uni-muenster.de
http://www.52north.org/geostatistics      e.pebesma at wwu.de