A dataset of Scots pine growth. The trees were collected on 56 fixed-area sample plots. The data includes no remeasurements. The growth data are based on measurements of increment borer chips.
data(spati)A data frame with 9913 observations on the following variables.
plotA unique sample plot id.
XPlot size in X-direction, meters
YPlot size in y-direction, meters
NStand density, trees per ha
GBasal area, \(m^2/ha\)
VPlot volume, \(m^3/ha\)
DgBasal-area weighted mean diameter, cm
HgHeight of basal area median diameter tree, m
TgAge of basal area median tree, yr
HdomDominant height, m
maospercentage of Scots pines of the total volume
kuospercentage of Norway spruces of the total volume
kanroA unique sample plot id (same as plot).
puunroTree id within plot.
pltree species. 1=Scots Pine
xkx- coordinates of trees within plot
yky- coordinates of trees within plot
dTree diameter at breast height (1.3 meters above the ground) in cm.
hTree height, m.
tTree age, years
dkTree diameter at stump height, cm. there seems to be some unclear issues.
X2bDouble bark thickness, mm
id1Tree diameter growth within the 5 year period prior to the measurement. Missing data coded as -1.
id2Tree diameter growth within the period 6-10 years prior to the measurement. Missing data coded as -1.
The data were collected by Timo Pukkala.
Pukkala, T. 1989. Prediction of tree diameter and height in a Scots pine stand as a function of the spatial pattern of trees. Silva Fennica 23(2): 83-99. tools:::Rd_expr_doi("10.14214/sf.a15532")
Mehtatalo, Lauri and Lappi, Juha 2020. Biometry for Forestry and Environmental Data: with examples in R. New York: Chapman and Hall/CRC. 426 p. tools:::Rd_expr_doi("10.1201/9780429173462")