SpatialPixelsDataFrame object to data frame.
object of class
variables to put into data frame (by default all of them)
This function is mainly used for plotting
SpatialPolygonsDataFrame objects with
ggplot rather than
spplot. The coordinates of each polygon are extracted and concatenated into one long data frame. The attributes of each polygon are then attached to this data frame as variables that vary by polygon
id (the rownames of the object).
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library(sp) library(ggplot2) opts_FRK$set("parallel",0L) df <- data.frame(id = c(rep(1,4),rep(2,4)), x = c(0,1,0,0,2,3,2,2), y=c(0,0,1,0,0,1,1,0)) pols <- df_to_SpatialPolygons(df,"id",c("x","y"),CRS()) polsdf <- SpatialPolygonsDataFrame(pols,data.frame(p = c(1,2),row.names=row.names(pols))) df2 <- SpatialPolygonsDataFrame_to_df(polsdf) ## Not run: ggplot(df2,aes(x=x,y=y,group=id)) + geom_polygon()
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