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]