SpatialPolygonsDataFrame_to_df: SpatialPolygonsDataFrame to df

In FRK: Fixed Rank Kriging

SpatialPolygonsDataFrame to df

Description

Convert SpatialPolygonsDataFrame or SpatialPixelsDataFrame object to data frame.

Usage

SpatialPolygonsDataFrame_to_df(sp_polys, vars = names(sp_polys))

Arguments

sp_polys	object of class SpatialPolygonsDataFrame or SpatialPixelsDataFrame
vars	variables to put into data frame (by default all of them)

Details

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).

Examples

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()

FRK documentation built on Sept. 11, 2024, 7:14 p.m.