Build doughnut geometries from a list of sf data frames

This function takes a list of sf data frames representing progressively buffered geometries and returns a new sf object where each row contains a doughnut-shaped geometry (i.e., the difference between successive buffers). This

Usage

doughnut_builder(poly_list)

Arguments

poly_list

A list of sf data frames. Each data frame must have the same number of rows, and represent a different buffer level of the same set of geometries.

Value

An sf data frame containing doughnut geometries for each input feature. The first geometry in each row is preserved, and the rest are doughnut-shaped differences.