Transforms a shapefile into a dataframe

This function takes in a shapefile (formal class of SpatialPolygonsDataFrame) and transforms it into a dataframe

sp2df(map, ...)

Arguments

map

A map object of class SpatialPolygonsDataFrame

...

Other arguments, currently ignored

Value

A dataframe, in which the first 7 columns hold geographical information (ex: long and lat)

Examples

if (FALSE) {
if(require(maptools)) {
  data(wrld_simpl)
  worldmap <- sp2df(wrld_simpl)
}

if ( require(ggplot2) && require(maptools) ) {
  data(wrld_simpl)
  World <- sp2df(wrld_simpl)
  World2 <- merge(World, Countries, by.x="NAME", by.y="maptools", all.y=FALSE)
  Mdata <- merge(Alcohol, World2, by.x="country", by.y="gapminder", all.y=FALSE)
  Mdata <- Mdata[order(Mdata$order),]
  qplot( x=long, y=lat, fill=ntiles(alcohol,5),
         data=subset(Mdata, year==2008), group = group,
                     geom="polygon")
}
}