R/data.R

In ElevDistr: Calculate the Distance to the Nearest Local Treeline

#' Points on or above the treeline
#'
#' @description A data set containing 133,302 points on or above the treeline.
#' The data set was generated with the function \code{generate_point_df}.
#' For the \code{gstRaster} (growing season temperature) and the \code{gslRaster}
#' (growing season length) raster layers from CHELSA V2.1 are used (see source),
#' the \code{stepSize} is set to 0.0416666 degrees.
#' The thresholds and the treeline definition is based on Paulsen and Körner,
#' Alp. Bot. 124: 1-12 (2014). The GMBA mountain inventory V1.2 was used to
#' remove points that do not lie within steep terrain.
#' @format A data frame with 511'930 rows and 2 variables:
#' \describe{
#'   \item{longitude}{Longitude of the point (in degrees; WGS 84).}
#'   \item{latitude}{Latitude of the point (in degrees; WGS 84).}
#' }
#' @source gstRaster: \url{https://os.zhdk.cloud.switch.ch/chelsav2/GLOBAL/climatologies/1981-2010/bio/CHELSA_gst_1981-2010_V.2.1.tif}
#' @source gslRaster: \url{https://os.zhdk.cloud.switch.ch/chelsav2/GLOBAL/climatologies/1981-2010/bio/CHELSA_gsl_1981-2010_V.2.1.tif}
"pointsAboveTreeline"