Union specified polygons within a shapefile.

Union specified polygons within a shapefile.

Usage

union_polygons(x, lyr, to.union, new.name = NULL)

Arguments

x

A shapefile of class SpatVector or a class that can be converted to a SpatVector

lyr

Name of layer identifying the polygons to union.

to.union

Names of polygons to union.

new.name

Which name to assign the unioned polygons. Default is the first item in "to.union".

Examples

if (FALSE) { # \dontrun{
library(gslSpatial)
library(terra)
library(tidyterra)
library(ggplot2)
v <- vect(system.file("ex/lux.shp", package="terra"))
ggplot()+geom_spatvector(data=v)+geom_spatvector_text(data=v,aes(label=NAME_2))
v2<-union_polygons(v,'NAME_2',c('Remich','Luxembourg'),'Remich-Luxembourg')
ggplot()+geom_spatvector(data=v2)+geom_spatvector_text(data=v2,aes(label=NAME_2))
} # }