grid.area: Create a Grid of Cell Areas or Perimeters

In SDMTools: Species Distribution Modelling Tools: Tools for processing data associated with species distribution modelling exercises

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 [e-mail] & Lorena Falconi [e-mail]

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)[,]

SDMTools documentation built on Jan. 11, 2020, 9:23 a.m.