convert.ba.mult {CTFS} | R Documentation

## Compute Basal Area for All Stems of an Individual Tree using Census Dataset and Multi-Stem Dataset

### Description

Computes the total basal area of an individual tagged tree by matching tree tag numbers of census dataset to multi-stem dataset. The basal area of each stem is computed from its dbh and summed together to provide a single basal area for each tagged tree. This function is usually called by other basal area functions, but can be called from the command line.

### Usage

    convert.ba.mult(census, mult, mindbh = 10)

### Arguments

`census` | name of census datafile for first census, must be a dataframe
`mult` | name of file (not in quotes) must be a dataframe with trees as rows and column as DBH. Must be of the same census year as `census1`. Tree tag numbers can be repeated up to the number of valid stems for measuement.
`mindbh` | Minimum DBH for computing population size in each census.

### Details

See `CTFS.basalarea` for details on the computation methods of basal area and associated functions.

When `convert.ba.mult` is called from another function, the parameter `mindbh` should be explicitly passed to assure proper behavior. Its use is determined by the function it is called from.

### Value

`convert.ba.mult` returns a dataframe with the following components:

`tag` | tag number of tree
`ba` | sum total basal area (m^2) of all multiple stems of tree

Rownames of returned dataframe are the tree tag number. Not all tree tag will be in the dataframe. Only those with at least 1 multiple stem.

### Author(s)

Rick Condit, Suzanne Lao, Pamela Hall

### See Also

`CTFS.basalarea`

### Examples

    ## Not run:
    1.  Default use of convert.ba.mult
    ba.conv.out <- convert.ba.mult(tst.bci90.mult,mindbh=10)

    2.  Set mindbh >= 100 mm (10 cm dbh)
    ba100.conv.out <- convert.ba.mult(tst.bci90.mult,mindbh=100)

    ## End(Not run)

[Package CTFS version 1.00 Index]