Transforms a shapefile into a dataframe
This function takes in a shapefile (formal class of
SpatialPolygonsDataFrame) and transforms it into a dataframe
sp2df(map, ...)
map |
A map object of class |
... |
Other arguments, currently ignored |
A dataframe, in which the first 7 columns hold geographical
information (ex: long and lat)
## Not run:
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")
}
## End(Not run)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.