Exercise

# Compute a convex hull around vectors

A more precise bounding polygon is sometimes needed, one that fits your data more neatly. For this, you can use the `st_convex_hull()`

function. Note that `st_convex_hull()`

will compute a tight box around each one of your features **individually** so if you want to create a convex hull around a group of features you'll need to use `st_union()`

to combine individual features into a single multi-feature.

Instructions

**100 XP**

- Use
`head()`

on`beech`

to look at the data frame and see the type of geometry. - Use
`st_union()`

to combine the individual points in the`beech`

object into a single`MULTIPOINT`

geometry and call this`beech1`

. - Use
`head()`

on`beech1`

to see the type of geometry of the dissolved object. - Use the
`length()`

function from`base`

R on`beech`

and`beech1`

to confirm that the number of features went from 17 to 1. - Use the
`st_convex_hull()`

function on`beech1`

to compute the tight bounding box around the beech trees and call this`beech_hull`

. - Plot
`beech_hull`

and then plot the points on top. Use`plot()`

twice and run the lines together.