| 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]