readelevdata {CTFS}R Documentation

Read a Text or RData Dataframe and Make a Matrix, Specifically for Elevation Data

Description

Read a tab delimited text file or an RData dataframe containing the x, y coordinates and elevation at those coordinates The standard file has measurements at every 5 by 5 m point in the plot. A matrix is returned for use in topographic mapping functions.

Usage

readelevdata(elevfile, gridsize = 5, text = FALSE)

Arguments

elevfile file containing elevation data. bcielev.info is the RData dataframe. Or specify a text, tab delimited file.
gridsize the scale at which the measurement in elevation were made. Must be regular.
text indicates where the elevfile is a text file or a dataframe.

Details

This function is used to convert a spreadsheet text file or a dataframe to a matrix so that topographic maps can be made of the plots.

Value

Returns a matrix with rows and columns in the same pattern of the actual measurement in the plot. In the case of the standard plot, 1000 by 500 m, measured at 5 m intervals, there are 101 rows and 201 columns. All edges of the plot are included.

1000 / 5 = 200 + 1 (outer edge) = 201 columns
500 / 5 = 100 + 1 (outer edge) = 101 rows

Author(s)

Rick Condit and Suzanne Lao

See Also

CTFS.readwrite

Examples

## Not run: 
readelevdata(bcielev.info)->elev.mat
dim(elev.mat)
bcielev.info[1:10,]
elev.mat[1:10,1:10]
  
## End(Not run)

[Package CTFS version 1.00 Index]