glob.change: glob.change

Description Usage Arguments Details Value

View source: R/glob.change.r

Description

The function glob.change computes a set of three global change metrics for comparison between two polygon sets. These metrics are outlined in Robertson et al. (2007; Table 4).

Usage

1
glob.change(T1, T2)

Arguments

T1

a SpatialPolygonsDataFrame object of polygons from time 1.

T2

a SpatialPolygonsDataFrame object of polygons from time 2.

Details

glob.change computes three change metrics, detailed below, that can be used to quantify changes between two polygon sets:

NumRatio – ratio between the number of polygons in T2 and T1;

NumRatio=#T1/#T2


AreaRatio – ratio between the areas of polygons in T2 and T1;

AreaRatio=A(T1)/A(T2)


AvgAreaRatio – ratio between the AreaRatio and NumRatio;

AvgAreaRatio=AreaRatio/NumRatio

Value

A list object with three elements - Results for the NumRatio, AreaRatio, and AvgAreaRatio metrics.


colinr23/stampr documentation built on April 18, 2018, 9:29 p.m.