meantopo.quad {CTFS} | R Documentation

## Mean Topographic Values for Quadrates

### Description

Computes the mean elevation, mean convexity and mean slope for quadrates in CTFS plots. Edge corrections are made. These values are computed from elevation measured on 5 x 5 m grid. These values preserved in the data file `bciquad.info`.

### Usage

    meantopo.quad(elevfile, gridsize = 20, plotdim = c(1000, 500))

### Arguments

`elevfile` | list composed of a data frame and a matrix each which contain elevation data
`gridsize` | the scale at which the measurement in elevation were made. Must be regular.
`plotdim` | dimensions of plot

### Details

This function requires the elevation data to be in a list. This data structure can be found in the data set `bcitopo.info` or created using `elev.to.list`. The values returned by this function have been saved in `bciquad.info`

On exit, this function returns the number of columns and rows of the elevation matrix. In the default case this should be 25 and 30.

### Value

Returns a data frame with:

`meanelev` | mean elevation (m) for quadrate
`convex` | convexity for quadrate, position is concave (hill), negative is convex (valley)
`slope` | mean slope (degrees) for quadrate

### Author(s)

Rick Condit

### See Also

`bcitopo.info`, `bciquad.info`,`CTFS.readwrite`, `map`

### Examples

    ## Not run:
    data(bcitopo.info)
    meanquad.info <- meantopo.quad(bcitopo.info$mat)
    ## End(Not run)

[Package CTFS version 1.00 Index]