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 Index]