r - How to export a dataset with "SpatialPolygonsDataFrame" as a shapefile

How to export spatial datasets in R, such as tornados dataset in GISTools package, as a shapefile with the exact same spatial reference and the exact values?

library(GISTools)

data(tornados)

Desired:

• "SpatialPolygonsDataFrame" to "shapefile"


• "(Forced) SpatialPointsDataFrame" to "shapefile"


• "(Non-Forced) SpatialPointsDataFrame" to "shapefile"


• "SpatialLinesDataFrame" to "shapefile".

Answer

Wesley's answer is correct. So to specifically export the tornado data you need to do:

library(GISTools)
library(rgdal)
data(tornados)

writeOGR(obj=torn, dsn="tempdir", layer="torn", driver="ESRI Shapefile") # this is in geographical projection

writeOGR(obj=torn2, dsn="tempdir", layer="torn2", driver="ESRI Shapefile") # this is in equal area projection

For R both of these datasets are simply treated as SpatialPointsDataFrames.

> class(torn)

[1] "SpatialPointsDataFrame"
attr(,"package")
[1] "sp"

> class(torn2)
[1] "SpatialPointsDataFrame"
attr(,"package")
[1] "sp"