ClassMetrics

cpc.sau.lulctools
Class ClassMetrics

java.lang.Object
  cpc.sau.lulctools.ClassMetrics

public class ClassMetrics
extends java.lang.Object

Contains methods for calculating class-lever pattern metrics on a landscape. The metrics are:

Number of Pixels: the total number of cells within the same class
Total Area: the total area comprised by the class
Percentage of Landscape: the percentage of the landscape comprised by the class
Number of Patches: the number of patches in the class
Mean Patch Size: the average patch size in the class
Median Patch Size: the median patch size in the class
Minimum Patch Size: the minimum patch size in the class
Maximum Patch Size: the maximum patch size in the class
Standand Deviational Patch Size: the standard deviation of patches in the class
Largest Patch Index: the percentage of the landscape comprised by the largest patch in the class
Patch Density: the density of the patches in the class on the landscape

Notes: In this documentation, the term class is used to refer to a land use type and the term patch refers to a parcel. All metrics are calcultated in meters or hectares. If the units of the input data are different, it will be necessary to modify the code accordingly.

ClassMetrics

public ClassMetrics(java.util.ArrayList<LulcCell> coverList,
                    java.lang.String type)

Create an arraylist of all patches in the class on the landscape

Parameters:

coverList - contains all LulcCell objects on the entire landscape

type - LULC class(i.e. land use type)

classNumberOfPixels

public int classNumberOfPixels()

Calculates the number of pixels (i.e. cells or LulcCell objects) in a class.

Returns:

the number of pixels (i.e. cells or LulcCell objects) in the class

classTotalArea

public double classTotalArea()

Calculates the total area of the class.

Returns:

the area comprised by the class, in hectares.

classPercentLand

public double classPercentLand()

Calculates the percentage of the landscape covered by the class

Returns:

the percentage of the landscape covered by the class

classNumberOfPatches

public int classNumberOfPatches()

Calculates the number of patches in the class

Returns:

the number of separate patches in the class of interest

classMeanPatchSize

public double classMeanPatchSize()

Calculates the mean patch size of the class

Returns:

the mean size, in hectares, of the patches in the class of interest

classMedianPatchSize

public double classMedianPatchSize()

Calculates the median patch size of the class

Returns:

the median patch size, in hectares, in the class of interest

classMiniPatchSize

public double classMiniPatchSize()

Calculates the minimum patch size in the class

Returns:

the minimum patch size, in hectares, in the class of interest

classMaxPatchSize

public double classMaxPatchSize()

Calculates the maximum patch size in the class

Returns:

the maximum patch size, in hectares, in the class of interest

classPatchStd

public double classPatchStd()

Calculates the standand deviation of the patches in the class of interest

Returns:

the standand deviation of the patches in the class of interest

classLargestPatchIndex

public double classLargestPatchIndex(java.util.ArrayList<LulcCell> coverList,
                                     java.lang.String type)

Calculates the Largest Patch Index of the class. It is equal to (max(a)/A)*100, where max(a) is the area of the largest patch in the class and A is the area of the entire landscape.

Returns:

the percentage of the landscape comprised by the largest patch

classPatchDensity

public double classPatchDensity(java.util.ArrayList<LulcCell> coverList,
                                java.lang.String type)

Calculates the patch density of the class. It is equal to n/A, where n is the number of patches in the class and A is the area of thr entire landscape.

Returns:

The number of patches per hectare of the class of interest