trees {treePlotArea}

Angle Count Sampling of the German National Inventory 2022

Description

This is an extract form a data set prepared by Gerald Kaendler. He

1. added trees that are not part of the angle count sampling,

2. converted the diameter at breast height from millimeter to centimeter and renamed it,

3. converted horizontal distance from centimeter to meter and renamed it,

4. computed correction factors using grenzkreis.

Usage

data("trees", package = "treePlotArea")

Format

A data frame with 1121 observations on the following 9 variables. Variables not needed with the package are marked with an asterisk.

tnr

The tract id.

enr

The corner id. A tract may have up to 4 corners on wooden floor.

bnr

The tree id.

bhd2

The diameter at breast height, given in centimeter

.

kf2

* The correction factor given by grenzkreis

.

entf

The trees' distance from the center of the tract's corner, given in meter.

azi

The azimuth from North, measured in gon (or gradian).

pk

* An indicator giving the type of a tree in the German national forest inventory. 0 marks ingrowth, 1 marks ongrowth.

stp

* An indicator giving the type of sample the tree was in. 0 marks the angle count sample with counting factor 4.

Examples

trees <- get(data("trees", package = "treePlotArea"))
summary(trees)
angle_counts <- bw2bwi2022de(trees)
summary(angle_counts)