#' The First of Two Overlapping Polygon Layers for Demonstration Purposes
#'
#' This polygon layer (\code{poly_1}) overlaps spatially with an other one
#' \code{\link{poly_2}}. They have one homonymous attribute \code{A} in common
#' and each of them is composed of four adjacent squares. These layers serve
#' the purpose of demonstrating the workings of the function \code{\link{st_or}}.
#'
#' @format Attributes:
#' \describe{
#' \item{A}{character}
#' \item{B}{integer}
#' \item{C}{year}
#' }
"poly_1"
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