PatchStat calculates the patch statistics for
individual patches identified in a matrix of data. The
matrix can be a raster of class 'asc' (adehabitat package),
'RasterLayer' (raster package) or 'SpatialGridDataFrame'
(sp package).
Usage
PatchStat(mat, cellsize = 1, latlon = FALSE)
Arguments
mat
a matrix of data with individual patches
identified as with ConnCompLabel; The matrix can
be a raster of class 'asc' (this & adehabitat package),
'RasterLayer' (raster package) or 'SpatialGridDataFrame'
(sp package)
cellsize
cell size (in meters) is a single value
representing the width/height of cell edges (assuming
square cells)
latlon
boolean value representing if the data is
geographic. If latlon == TRUE, matrix must be of class
'asc', 'RasterLayer' or 'SpatialGridDataFrame'
the number of cells for each patch,
specified in square meters.
n.core.cell
the number
of cells in the core area, without the edge area.
n.edges.perimeter
the number of outer perimeter cell
edges of the patch.
n.edges.internal
the number of
internal cell edges of the patch.
area
the area of
each patch comprising a landscape mosaic.
core.area
represents the interior area of the patch,
greater than the specified depth-of-edge distance from the
perimeter.
perimeter
the perimeter of the patch,
including any internal holes in the patch, specified in
meters.
perim.area.ratio
the ratio of the patch
perimeter (m) to area (m2).
shape.index
the shape
complexity, sum of each patches perimeter divided by the
square root of patch area.
frac.dim.index
fractal
dimension index reflects shape complexity across a range of
spatial scales; approaches 2 times the logarithm of patch
perimeter (m) divided by the logarithm of patch area (m2).
core.area.index
quantifies core area as a percentage
of patch area.
McGarigal, K., S. A. Cushman, M. C. Neel, and E. Ene. 2002.
FRAGSTATS: Spatial Pattern Analysis Program for Categorical
Maps. Computer software program produced by the authors at
the University of Massachusetts, Amherst. Available at the
following web site:
www.umass.edu/landeco/research/fragstats/fragstats.html