R: Create a Grid of Cell Areas or Perimeters

grid.area {SDMTools} | R Documentation

## Create a Grid of Cell Areas or Perimeters

### Description

Creates a grid of cell areas or perimeters for spatial grids in geographic (lat-lon) projections.

### Usage

    grid.area(mat)

    grid.perimeter(mat)

### Arguments

`mat` | a matrix representing a raster of class 'asc' (this & adehabitat package), 'RasterLayer' (raster package) or 'SpatialGridDataFrame' (sp package)

### Value

`grid.area` | Returns an ascii grid file which contains the values of the area in each cell.
`grid.perimter` | Returns an ascii grid file which contains the values of the perimeter in each cell.

### Author(s)

Jeremy VanDerWal jjvanderwal@gmail.com & Lorena Falconi lorefalconi@gmail.com

### Examples

    #Create an ascii file
    y=seq(10,50,0.5)
    x=seq(140,180,0.5)
    cellsize=0.5
    data1=sample(160,140)
    out1.asc=as.asc(matrix(data1,nc=y, nr=x), xll=min(x), yll=min(y), cellsize=cellsize)

    grid.area(out1.asc)[,]

    grid.perimeter(out1.asc)[,]

[Package SDMTools version 1.1-221.2 Index]