R/data-trlpsptime.r

In biometrics: A Package for Biometrics and Modelling

#' Long term tree-list data from permanent sample plots
#'
#' @description
#' Temporal tree-level data within four sample plots
#'  in an experimental forest in Austria. The dataframe contains several
#' tree-level variables. Plot sizes are 2500 m\eqn{^{2}}{^2} (approx.).
#' @usage
#' data(trlpsptime)
#' @format Contains tree-level variables, as follows:
#' \describe{
#'   \item{plot}{Plot number.}
#'   \item{tree}{Tree identificator.}
#'   \item{species}{Species code as follows:
#'   PCAB=_Picea abies_, LADC=_Larix decidua_, PNSY=_Pinus sylvestris_,
#'   FASY=_Fagus Sylvatica_, QCPE=_Quercus petraea_, BTPE=_Betula pendula_.}
#'   \item{year}{Year of measurement.}
#'   \item{obs}{Observation.}
#'  \item{dbh}{Diameter at breast-height, in mm.}
#'  \item{dbh2}{Orthogonal measured second diameter, in mm.}
#'  \item{hmk}{Selection criteria to measure tree height.
#'  `1`=systematic, `2`=systematic and in the group of the 100 thickest,
#'  `3`=belongs to the 100 thickest, `4`=lying tree, `5`=Standing tree with a ladder,
#'  `6`=outlier, `7`=from stem analysis.}
#'  \item{kh}{Type of the height measurement. `0`=tree height,
#'  `1`=angle and distances.}
#'  \item{ho}{Tree height in dm when `kh=0`. When `kh=1` then distance to the tree
#'   in dm or in 1977 length of the base bar in cm.}
#'  \item{ka}{Height to the crown base in dm when `kh=0`. When `kh=1` then angle
#'  to the tree top in 1/10 degree.}
#'  \item{kb}{Crown width in dm when `kh=0`. When `kh=1` then angle to 1.3 m
#'  above tree base in 1/10 degree.}
#'  \item{wka}{Angle to crown base in 1/10 degree.}
#'  \item{crown.cl}{Crown class according to Kraft. `1`=predominant,
#'  `2`=dominant, `3`=co-dominant, `4`=dominated, `5`=overtopped.}
#'  \item{crown}{Crown quality. `0`=normal, `1`=broken in the crown region,
#'  `2`=substituted tree top, `3`=forked, `4`=bushy, stork nest, witches' broom,
#'  `5`=wizen tree top, `6`=again broken tree top.}
#'  \item{stem}{Stem quality. `0`=typical, `1`=crooked, `2`=abiotic damaged,
#'  `3`=biotic damaged, `4`=forked stem without damage, `5`=forked stem with damage,
#'  `6`=up to 1/3 of the girth is peeled,
#'  `7`=more than 1/3 of the girth is peeled,
#'  `8`=broken stem, `9`=other stem damages.}
#'  \item{defoliation}{crown defoliation. `1`=low, `2`=medium, `3`=much.}
#'  }
#' @source
#' The Austrian Research Center for Forests established a spacing experiment
#'  with Norway spruce (_Picea abies_) in the Vienna Woods. In the ``Hauersteig''
#'  experiment, several tree-level variables were measured within four sample
#'  plots over time.
#' Data were retrieved from the paper cited below, where several details
#' might be worth reading.
#' @references
#' - Kindermann G. Kristofel F, Neumann M, Rossler G, Ledermann T &
#' Schueler. 2018. 109 years  of forest growth measurements from
#' individual Norway spruce trees. Sci. Data 5:180077
#' \doi{10.1038/sdata.2018.77}
#' 
#' @examples
#' data(trlpsptime)
#' df<-trlpsptime
#' head(df)
#' tapply(df$dbh, list(df$year,df$plot), mean)
'trlpsptime'