Exercise

# Compute polygon centroids

Similar to buffering, computing polygon centroids is a bedrock geoprocessing task used to assign values and even to help with labeling maps. The function for this in `sf`

is `st_centroid()`

.

Also similar to buffering, centroid calculations should generally be performed on data with a projected coordinate reference system.

Instructions

**100 XP**

- Read in the neighborhoods shapefile (
`"neighborhoods.shp"`

). - Project/transform the neighborhoods shapefile and use CRS number 32618 as the
**target**CRS, this is the code for the CRS of the`manhattan`

image. - Compute the centroids with
`st_centroid()`

and store as an object named`centroids`

. Only one argument is required. - Plot the geometry of
`neighborhoods_tf`

object with the centroids on top. This requires two calls to`plot()`

run together. The second will need`add = TRUE`

.