eeptools (version 0.9.0)

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 a dataframe

xid

Name of ID variable in the SpatialPolygonsDataFrame

yid

Name of ID variable in the 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")