tst.bci90.full {CTFS} | R Documentation

## Structure of CTFS Long Term Forest Data Set for a Single Census

### Description

The structure of the CTFS Long Term Forest data set for all trees with census information from a single census including variable names, values for categorical variable and the contents of a test file for demonstration of functions.

### Usage

    data(tst.bci90.full)

### Format

A data frame with 12421 observations on the following 9 variables.

tag
  a numeric vector, tree identification number
sp
  character, species name code
gx
  a numeric vector, location on East-West axis, in meters
gy
  a numeric vector, location on North-South axis, in meters
dbh
  a numeric vector, DBH in mm measured in year indicated
pom
  a numeric vector, Point of Measurement, in m measured in year indicated
date
  a numeric vector, Date of measurement of quadrat in days since initial measurement of plot since year indicated
codes
  character, various values which indicate condition of tree such as broken stems, etc. in year indicated
status
  character, value indicating whether the tree is alive, dead or a recruit of that census

### Details

`tst.bci90.full` and `tst.bci95.full` are subsets of the complete data files for BCI census 1990 and 1995, respectively.

`tst.bci90.spp`, `tst.bci90.quad` and `tst.bci95.spp`, `tst.bci95.quad` are the same data as the `*.full` files restructured as a list of dataframes. For `*.spp` each data frame consists of the records of a single species. For `*.quad` each data frame consists of the record for a single quadrate (20 x 20). The names on the list are the species names and quadrate number, respectively. The `*.quad` file is used for the density dependent analysis. They are created using `sep.data` for `*.spp` and `sep.vct.data` for for `*.quad` files.

The variable `codes` can have many different values which have different meaning at each site. It is best not to use this variable because of its inconsistency across sites.

### Contents ot Test Files

Only three species are included in these test files: alsebl, psycde, and socrex.

the species names and number of trees for each are:
alsebl:`data.frame': 11128 obs. of 9 variables:
psycde:`data.frame': 160 obs. of 9 variables:
socrex:`data.frame': 1133 obs. of 9 variables:

### Variable Values

POM | Point of Measurement
0 | at initial position
1 | first change of POM
2 ... | second to n change of POM
STATUS | Values
“A” | alive
“AB” | alive but broken
“AS” | alive but broken, used at the site Pasoh
“D” | dead
“P” | not yet large enough for measurement, future recruit
NA | missing data, unknown cause

Only trees with STATUS == “A” have valid dbh measurements. All other trees have a dbh = NA.

### Source

The Center for Tropical Forest Science
http://www.ctfs.si.edu

### Examples

    ## Not run:
    data(tst.bci90.full)
    str(tst.bci90.full)
    data(tst.bci90.spp)
    str(tst.bci90.spp)
    ## End(Not run)

[Package CTFS version 1.00 Index]