[R-sig-Geo] merging several shapefiles into one

[Pierre Roudier]

Hi Nicolas,

I do not have a R session handy, but if I remember correctly, the
function gUnion() in the rgeos package would do what you want.

Hope this helps,

Pierre

2011/5/25 Nicolas Degallier <nicolas.degallier at ird.fr>:
> Hi All,
>
> I have read different shapefiles that are contiguous and that have different column names with the function "readShapePoly".
>
> example :
>
> noumea <- readShapePoly(noumea.file, IDvar = "NOUMEA2_ID", proj4string = crs_rgnc)
>
> and
>
> dumbea <- readShapePoly(dumbea.file, IDvar = "DUMBEA2_", proj4string = crs_rgnc)
>
> Now I would like to create a new shapefile with all the polygones in the "noumea" and "dumbea" spatial polygone data frames.
>
> I tried :
> spRbind(noumea, dumbea)
>
> I get this message error :
>
> Error in spRbind(as(obj, "SpatialPolygons"), as(x, "SpatialPolygons")) :
>  non-unique polygon IDs
>
> I have tried with the function rbind()
> I have tried to set noumea$NOUMEA2_ID and dumbea$DUMBEA2_ with unique values but I still get the same message error as if the function spRbind was not using those two columns as polygons ID...
>
> Does anyone know how I can fix this problem ?
>
> Thanks a lot
>
> Nicolas
>
>
> Nicolas Degallier
>
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