bciquad.info {CTFS} | R Documentation

## Dataset of Information for each 20 by 20 m quadrate in the BCI 50 ha plot

### Description

A tabulation of information on each quadrate that is dervied from the initial establishment of the plot (elevation, convexit and slope) and from further analyses of these and other topographic or local environmental features. These characteristics are independent of the trees that occupy the quadrates and their species identification.

### Usage

    data(bciquad.info)

### Format

A data frame with 1250 observations on the following 5 variables.

elev
  a numeric vector, elevation, msl
convex
  a numeric vector
slope
  a numeric vector
hab
  a numeric vector, a value from 1 to n, assigned by investigator. Combinations of altitude, slope and convexity, mapped location of streams, swamps, etc. can be used to define habitats
quad
  a factor with levels 1250 in the standard 50 Ha Plots

### Details

`bciquad.info` variables have the following values:

hab
  the habitat assigned to a quadrate by topographic values. These values have been assigned by the habitat analysis function associated with the "torus" analysis.

Code | Habitat_Type | Number_Quadrates
1 | low_plateau | 168
2 | hi_plateau | 81
3 | low_slope | 277
4 | hi_slope | 99
5 | low_hill | 173
6 | hi_hill | 203
7 | low_hilly_slope | 129
8 | hi_hilly_slope | 120
“.” | missing | 0

quad
  an "index" number for each quadrates. For this BCI dataset a quadrate is 20 by 20 m and there are 1250 of them in a 1000 by 500 m plot. The convention is to number the quadrates starting in the southwest corner and going northward up a "column" of 25, and returning to the southern border for 26-50, etc.

25 | 50 | 75 ... | 1250
24 | 49 | 74 ... | 1249
. | . | . ... | .
. | . | . ... | .
. | . | . ... | .
3 | 28 | 53 ... | 1228
2 | 27 | 52 ... | 1227
1 | 26 | 51 ... | 1226

### Source

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

### Examples

    ## Not run:
    str(bciquad.info)
    ## End(Not run)

[Package CTFS version 1.00 Index]