| getDeclineStats {redlistr} | R Documentation |
Change statistics.
Description
getDeclineStats calculates the Proportional Rate of Decline (PRD),
Absolute Rate of Decline (ARD) and Annual Rate of Change (ARC), given two
areas at two points in time. Also provides the total area difference. Inputs
are usually the results from getArea.
Usage
getDeclineStats(A.t1, A.t2, year.t1, year.t2, methods)
Arguments
A.t1 |
Area at time t1 |
A.t2 |
Area at time t2 |
year.t1 |
Year of time t1 |
year.t2 |
Year of time t2 |
methods |
Method(s) used to calculate rate of decline. Either 'PRD', 'ARD', and/or 'ARC'. See vignette to see a more detailed explanation for each of them. |
Value
A dataframe with absolute differences between the two inputs, and a selection of:
Proportional Rate of Decline (PRD)
Absolute Rate of Decline (ARD)
Annual Rate of Change (ARC)
Author(s)
Nicholas Murray murr.nick@gmail.com, Calvin Lee calvinkflee@gmail.com
References
Bland, L.M., Keith, D.A., Miller, R.M., Murray, N.J. and Rodriguez, J.P. (eds.) 2016. Guidelines for the application of IUCN Red List of Ecosystems Categories and Criteria, Version 1.0. Gland, Switzerland: IUCN. ix + 94pp. Available at the following web site: https://iucnrle.org/ Puyravaud, J.-P. 2003. Standardizing the calculation of the annual rate of deforestation. Forest Ecology and Management, 177, 593-596.
See Also
Other Change functions:
getArea.RasterLayer(),
getArea.SpatRaster(),
getArea.SpatVect(),
getArea.SpatialPolygons(),
getArea.sf(),
getAreaLoss(),
getArea()
Examples
a.r1 <- 23.55
a.r2 <- 15.79
decline.stats <- getDeclineStats(a.r1, a.r2, year.t1 = 1990, year.t2 = 2012,
methods = c('ARD', 'ARC'))