auxiTreeCompiler: Derive volume components for H-enhanced and non-enhanced...

In bcgov/BCForestGroundSample: BC forest ground sample compilation

Description

Estimates volume components for H-enhanced and non-enhanced trees using regression and ratio methods. For H-enhanced trees, the whole stem volume and gross merchantable volume are already calculated directly using taper equations; and rest of volume components will be calculated using ratio method in this function. For non-enhanced trees, the whole stem volume is derived using regression equation between basal area and whole stem volume and the rest of volume components will be computed using ratio method in this function. The function is part of vol_ha_2017.sas.

Usage

auxiTreeCompiler(fullMeasuredTrees, auxiTrees, clusterPlotHeader)

Arguments

fullMeasuredTrees	Compiled tree-level data in vi_c, which contains full measured trees, enhanced trees and H-enhanced trees. This data is output of DWBCompiler
auxiTrees	data.table, Non-enhanced trees in anxilirary plots, however, it may have enhanced trees and H-enhanced trees. An output from VRIInit_auxTree.
clusterPlotHeader	data.table, Cluster and plot-level information. An output of VRIInit_clusterplot.

Value

A list of four tables: 1. fullenhancedtrees: full and enhanced trees; 2. HnonenhancedTrees: Height enhanced and non-enhanced trees; 3. regression table; 4. ratio table.

Note

The data selection procedure for regression has been standardized as following:

1. Start from vi_c, which has all trees have minimum information of DBH and Height;

2. Select all the full, enhanced and H-enhanced trees;

3. Remove observations in Audit plots and have zero whole stem volume;

4. Select the latest observation for each tree by live_dead status. A tree's identity is considered same when it is from same proj_id, samp_no and plot.

The data selection for ratio has been standardized as following:

1. Start from the that used for regression;

2. Select all the full and enhanced trees;

3. Select the trees with DBH >= 10cm

Author(s)

Yong Luo

bcgov/BCForestGroundSample documentation built on May 25, 2019, 3:21 p.m.