select_valid_angle_count_trees: Select Valid Angle Counts Only

In treePlotArea: Correction Factors for Tree Plot Areas Intersected by Stand Boundaries

Select Valid Angle Counts Only

Description

The tree data coming with this package was processed by Gerald Kaendler for the country of Baden-Wuerttemberg, and is the reference for testing as he adjusted diameter measurements to breast height where they had been measured in diverging heights (due to deformations of trees at breast height). Which we really need to do. But he also added trees that are not part of the angle count sampling, which this function removes. We need that mainly to run tests against the reference values computed by grenzkreis because we would not be able to easily find the keys to merge the data. So this function is probably of no use to you. And we remove trees with a diameter at breast height greater than zero and a distance of 0, for these tree should not be there.

Usage

select_valid_angle_count_trees(x, sample_type = "stp", tree_status = "pk")

Arguments

x	A tree data set, typically get(data(trees, package = "treePlotArea")).
sample_type	An indicator giving the type of sample the tree was in. 0 marks the angle count sample with counting factor 4.
tree_status	An indicator giving the status of a tree in the German national forest inventory. 0 marks ingrowth, 1 marks ongrowth.

Value

A tree data containing valid angle count trees only.

See Also

Other data functions: bw2bwi2022de()

Examples

trees <- get(data("trees", package = "treePlotArea"))
subset(trees, entf == 0 & bhd2 > 0 & stp == 0)
angle_counts <- select_valid_angle_count_trees(trees)
subset(angle_counts, entf == 0 & bhd2 > 0 & stp == 0)

treePlotArea documentation built on June 22, 2024, 6:57 p.m.