grid.area {SDMTools} | R Documentation |
Creates a grid of cell areas or perimeters for spatial grids in geographic (lat-lon) projections.
grid.area(mat) grid.perimeter(mat)
mat |
a matrix representing a raster of class 'asc' (this & adehabitat package), 'RasterLayer' (raster package) or 'SpatialGridDataFrame' (sp package) |
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. |
Jeremy VanDerWal jjvanderwal@gmail.com & Lorena Falconi lorefalconi@gmail.com
#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)[,]