eeptools (version 0.3.1)

mapmerge: Combine an S4 polygon object with a dataframe

Description

Convenience function for merging dataframes and S4 spatial polygon objects.

Usage

mapmerge(mapobj, data, xid, yid)

Arguments

mapobj

Name of an S4 SpatialPolygonsDataFrame

data

Name of an S3 dataframe

xid

Name of ID variable in the SpatialPolygonsDataFrame

yid

Name of ID variable in the S3 dataframe

Value

• A SpatialPolygonsDataFrame with new variables attached from supplied dataframe

Examples

xx <- maptools::readShapePoly(system.file("shapes/sids.shp", package="maptools")[1], IDvar="FIPSNO")
yy<-as(xx,"data.frame")
yy$newvar<-sample(letters,nrow(yy),replace=TRUE)
yy<-subset(yy,select=c("FIPS","newvar"))
newpoly<-mapmerge(xx,yy,xid="FIPS",yid="FIPS")