Type: | Package |
Title: | Time Series Segmentation of Residual Trends |
Version: | 0.3.1 |
Description: | Time Series Segmented Residual Trends is a method for the automated detection of land degradation from remotely sensed vegetation and climate datasets. TSS-RESTREND incorporates aspects of two existing degradation detection methods: RESTREND which is used to control for climate variability, and BFAST which is used to look for structural changes in the ecosystem. The full details of the testing and justification of the TSS-RESTREND method (version 0.1.02) are published in Burrell et al., (2017). <doi:10.1016/j.rse.2017.05.018>. The changes to the method introduced in version 0.2.03 focus on the inclusion of temperature as an additional climate variable. This allows for land degradation assessment in temperature limited drylands. A paper that details this work is currently under review. There are also a number of bug fixes and speed improvements. Version 0.3.0 introduces additional attribution for eCO2, climate change and climate variability the details of which are in press in Burrell et al., (2020). The version under active development and additional example scripts showing how the package can be applied can be found at https://github.com/ArdenB/TSSRESTREND. |
License: | GPL-3 |
LazyData: | TRUE |
Imports: | stats, graphics, utils, bfast (≥ 1.5.7), broom, strucchange, ggplot2, RcppRoll, mblm |
Suggests: | rgl, car |
Depends: | R (≥ 3.6.0) |
RoxygenNote: | 7.1.1 |
NeedsCompilation: | no |
Packaged: | 2020-08-02 19:52:28 UTC; aburrell |
Author: | Arden Burrell [aut, cre] |
Maintainer: | Arden Burrell <arden.burrell@gmail.com> |
Repository: | CRAN |
Date/Publication: | 2020-08-02 20:10:02 UTC |
TSS.RESTREND: Time Series Segmented RESidual TREND
Description
The TSS-RESTREND package is designed used via the TSS-RESTREND function which calls all the other functions in the correct order to perform a complete TSS-RESTREND analysis. The individual functions have been made callable to allow for greater user control. The version in active development, as well as additional documentation, data and example scripts, see https://github.com/ArdenB/TSSRESTREND.
Details
Version 0.3.0
Note
This code is a demostration of the method and not the code used in Burrell et. al., (2017). The original code uses both python and R and was designed for batch proccessing. For the pixels tested using the TSS.RESTREND package it produces identical results.
Author(s)
Maintainer: Arden Burrell arden.burrell@gmail.com
Antecedental Rainfall (and temperature) Accumulation calculator for the VI Complete Time Series
Description
Takes the Complete Time Series Vegetation Index and a table of every possible accumulation period and offset
period for precipitation and temperature(optional). A OLS is calculated lm
for every combination
of VI ~ rainfall (and temperature if that is included).
if only the VPR is being calculated, this Function preferences those results where slope>0
(increase in rainfall causes an increase in vegetation),returning the rainfall accumulation
that has the highest R-squared and a positive slope. If no combination produces a
positive slope then the one with the highest R-squared is returned.
Usage
ACP.calculator(
CTSR.VI,
ACP.table,
ACT.table = NULL,
allow.negative = FALSE,
allowneg.retest = FALSE
)
Arguments
CTSR.VI |
Complete Monthly Time Series of Vegetation Index values.
An object of class |
ACP.table |
A table of every combination of offset period and accumulation period.for precipitation
ACP.table can be calculated using the |
ACT.table |
A table of every combination of offset period and accumulation period.for temperature
ACP.table can be calculated using the |
allow.negative |
If true, will not preference positive slope in either CTSR or VI calculations. default=FALSE is set because negative associations between rainfall and vegetation in water limited ecosystems is unexpected If temperature data is included then this paramter is forced to TRUE. |
allowneg.retest |
default=FALSE If temperature data is provided but found to not be significant then a retest is performed. This paramter is to allow negative on re-test. |
Value
A list containing:
summary
a Matrix containing "slope", "intercept", "p.value", "R^2.Value", "Break.Height", "Slope.Change"
of the lm
between Antecedental Rainfall Accumulation (CTSR.RF) and the CTSR.VI
CTSR.precip
see CTSR.RF in TSSRESTREND
for description
CTSR.osp The offest period for the complete time series rainfall
CTSR.acp The accumulation period for the complete time series rainfall
CTSR.tmp The optimally accumulated CTS temperature
CTSR.tosp The offest period for the complete time series temperature
CTSR.tacp The accumulation period for the complete time series temperature
Examples
#Find the data
vi.path <- system.file("extdata", "rabbitVI.csv", package = "TSS.RESTREND", mustWork = TRUE)
in.VI <- read.csv(vi.path)
CTSR.VI <- ts(in.VI, start=c(1982, 1), end=c(2013,12), frequency = 12)
data(rabbitACPtable)
ACPres <- ACP.calculator(CTSR.VI, rabbitACPtable)
print(ACPres$summary)
Annual max VI Calculator
Description
Takes the montly time series of the VI and calculates the growing season max VI. In series where the peak occurs in November or December, an interannual growing season is assessed.
Usage
AnMaxVI(CTSR.VI)
Arguments
CTSR.VI |
Complete Monthly Time Series of Vegetation Index values.
An object of class |
Value
Max(anu.VI)
The annual (Growing season) max VI. See TSSRESTREND
Max.Month The month number where max values were observed (1 for January). if month > 12, the peak was detected in Nov, Dec, Jan. In this case the peak seasonal value and position is used.
index(VI.index)
the index of the CTSR.VI ts that the anu.VI values occur at.
See TSSRESTREND
. Note.R indexs from 1 rather than 0.
Author(s)
Arden Burrell, arden.burrell@unsw.edu.au
Examples
anmax <- AnMaxVI(stdRESTRENDCTSR$cts.NDVI)
print(anmax)
Antecedental accumulation calculator for the annual max VI time series
Description
Takes the Annual Max VI Time Series, the VI.index and tables of every possible accumulation
period and offset period for preciptation and Temperature (optional). A OLS is calculated
lm
for every combination of VI ~ rainfall. If temperature is provided
The formula is (VI ~ rainfall + temperature). By defualt, this function preferences those results where
slope>0 (increase in rainfall causes an increase in vegetation), returning the rainfall accumulation
that has the highest R-squared and a positive slope. If no combinations produce a positive slope then the
one with the highest Rsquared is returned.
TO DO: non peramtric and other variables
Usage
AnnualClim.Cal(
anu.VI,
VI.index,
ACP.table,
ACT.table = NULL,
Breakpoint = FALSE,
allow.negative = FALSE,
allowneg.retest = FALSE
)
Arguments
anu.VI |
The annual (Growing season) max VI. Must be a object of class |
VI.index |
the index of the CTSR.VI ts that the anu.VI values occur at. Must be the same length
as anu.VI. NOTE. R indexs from 1 rather than 0.
if VI.index=FALSE, it will be calculated from the CTSR.VI using |
ACP.table |
A table of every combination of offset period and accumulation period.for precipitation
ACP.table can be calculated using the |
ACT.table |
A table of every combination of offset period and accumulation period.for temperature
ACP.table can be calculated using the |
Breakpoint |
Used when calcualting rf.bf and rf.af for ts with breakpoints in the VPR. See |
allow.negative |
If true, will not preference positive slope in either CTSR or VI calculations. default=FALSE is set because negative associations between rainfall and vegetation in water limited ecosystems is unexpected If temperature data is included then this paramter is forced to TRUE. |
allowneg.retest |
default=FALSE If temperature data is provided but found to not be significant then a retest is performed. This paramter is to allow negative on re-test. |
Value
summary
a Matrix containing "slope", "intercept", "p.value", "R^2.Value", "Break.Height", "Slope.Change"
of the lm
of VI ~ rainfall. If Breakpoint, summary covers both rf.b4 and rf.af.
acu.RF
(aka. annual.precip)The optimal accumulated rainfall for anu.VI. Mut be a object of class 'ts'
and of equal length to anu.VI. It is caculated from the ACP.table by finding the acp and osp
that has the largest R^2 value. lm
(anu.VI ~ rainfall)
acu.TM
(aka, annual.temp) The optimal accumulated rainfall for anu.T<. Mut be a object of class 'ts'
and of equal length to anu.VI. It is caculated from the ACT.table by finding the tacp and tosp
that has the largest R^2 value. lm
(anu.VI ~ rainfall+temperature)
rf.b4 The optimal acumulated rainfall before the Breakpoint
rf.af The Optimally accumulated rainfall after the Breakpoint
tm.b4 The optimal acumulated temperature before the Breakpoint
tm.af The Optimally accumulated temperature after the Breakpoint
osp The offest period for the annual max time series rainfall
acp The accumulation period for the annual max time series rainfall
tosp The offest period for the annual max time series temperature
tacp The accumulation period for the annual max time series temperature
Author(s)
Arden Burrell, arden.burrell@unsw.edu.au
Examples
ARC <- AnnualClim.Cal(stdRESTREND$max.NDVI, stdRESTREND$index, stdRESTRENDrfTab)
print(ARC)
## Not run:
#Test the complete time series for breakpoints
VPRBFdem <- VPR.BFAST(segVPRCTSR$cts.NDVI, segVPRCTSR$cts.precip)
bp<-as.numeric(VPRBFdem$bkps)
#test the significance of the breakpoints
reschow <- CHOW(segVPR$max.NDVI, segVPR$acum.RF, segVPR$index, bp)
brkp <- as.integer(reschow$bp.summary["yr.index"])
ARCseg <-AnnualClim.Cal(segVPR$max.NDVI, segVPR$index, segVPRrfTab, Breakpoint = brkp)
print(ARCseg)
## End(Not run)
Chow test on detected breakpoints
Description
Takes the breakpoints detected by VPR.BFAST
, finds the most significant one then tests it in both
the residuals and the VPR.
Usage
CHOW(anu.VI, acu.RF, VI.index, breakpoints, acu.TM = NULL, sig = 0.05)
Arguments
anu.VI |
The annual (Growing season) max VI. Must be a object of class |
acu.RF |
The optimal accumulated rainfall for anu.VI. Must be a object of class |
VI.index |
the index of the CTSR.VI ts that the anu.VI values occur at. Must be the same length
as anu.VI. NOTE. R indexs from 1 rather than 0.
if VI.index=FALSE, it will be calculated from the CTSR.VI using |
breakpoints |
vector containing the breakpoints detected by |
acu.TM |
The optimal accumulated rainfall for anu.TM. Must be a object of class |
sig |
Significance of all the functions. defualt sig=0.05 |
Value
n.Method The method that the ts should be tested with. TSSRESTREND internal communication.
bp.summary
Summary of the most signifcant breakpoint in the residuals and VPR.
see sctest
allbp.index
the Annual index of every breakpoint. Used by plot.TSSRESTREND
bpRESID.chow
Chow test in the VPR residuals. See sctest
bpVPR.chow
Chow test in the VPR. See sctest
Author(s)
Arden Burrell, arden.burrell@unsw.edu.au
Examples
## Not run:
#Test the complete time series for breakpoints
VPRBFdem <- VPR.BFAST(segVPRCTSR$cts.NDVI, segVPRCTSR$cts.precip)
bp <- as.numeric(VPRBFdem$bkps)
#test the significance of the breakpoints
reschow <- CHOW(segVPR$max.NDVI, segVPR$acum.RF, segVPR$index, bp)
print(reschow)
## End(Not run)
RESTREND (RESidual TREND)
Description
For ts with no significant breakpoints in the residuals or the VPR. Takes annual VI max and it associated optimal accumulated precipitation
Usage
RESTREND(
anu.VI,
acu.RF,
VI.index,
acu.TM = NULL,
sig = 0.05,
retnonsig = FALSE
)
Arguments
anu.VI |
The annual (Growing season) max VI. Must be a object of class |
acu.RF |
The optimal accumulated rainfall for anu.VI. Must be a object of class |
VI.index |
the index of the CTSR.VI ts that the anu.VI values occur at. Must be the same length
as anu.VI. NOTE. R indexs from 1 rather than 0.
if VI.index=FALSE, it will be calculated from the CTSR.VI using |
acu.TM |
The optimal accumulated rainfall for anu.TM. Must be a object of class |
sig |
Significance of all the functions. defualt sig=0.05 |
retnonsig |
Bool. New in v0.3.0. Allows TSSRESTREND to return change estimates of values that filed the sig component in the residual analysis. defualt FALSE will give the same result as eralier versions. |
Value
a list of class TSSRESTREND.
See TSSRESTREND
for details. Note. if called seperatly from TSSRESTREND,
this list will be incomplete.
Author(s)
Arden Burrell, arden.burrell@unsw.edu.au
Examples
restrend <- RESTREND(stdRESTREND$max.NDVI, stdRESTREND$acc.precip, stdRESTREND$index)
print(restrend)
Time Series Segmentation of Residual Trends (MAIN FUNCTION)
Description
Time Series Segmented Residual Trend (TSS.RESTREND) methodology.Takes in a complete monthly time series of a VI and its corrosponding precipitation (and temperature). It then looks looks for breakpoints using the BFAST function. The significance of the breakpoin in the residuals and the VPR is assessed using a Chow test, then, the total time series change is calculated.
Usage
TSSRESTREND(
CTSR.VI,
ACP.table = FALSE,
ACT.table = NULL,
CTSR.RF = FALSE,
CTSR.TM = NULL,
anu.VI = FALSE,
acu.RF = FALSE,
acu.TM = NULL,
VI.index = FALSE,
rf.b4 = FALSE,
rf.af = FALSE,
sig = 0.05,
season = "none",
exclude = 0,
allow.negative = FALSE,
allowneg.retest = FALSE,
h = 0.15,
retnonsig = FALSE
)
Arguments
CTSR.VI |
Complete Monthly Time Series of Vegetation Index values.
An object of class |
ACP.table |
A table of every combination of offset period and accumulation period.for precipitation
ACP.table can be calculated using the |
ACT.table |
A table of every combination of offset period and accumulation period.for temperature
ACP.table can be calculated using the |
CTSR.RF |
Complete Time Series of Rainfall. An object of class 'ts' object without NA's
and be the same length and cover the same time range as CTSR.VI.
If ACP.table is provided, CTSR.RF will be automitaclly calculated using the
|
CTSR.TM |
Complete Time Series of temperature. An object of class 'ts' object without NA's
and be the same length and cover the same time range as CTSR.VI. Default (CTSR.TM=NULL).
If ACT.table is provided, CTSR.RF will be automitaclly calculated using the
|
anu.VI |
The annual (Growing season) max VI. Must be a object of class |
acu.RF |
The optimal accumulated rainfall for anu.VI. Must be a object of class |
acu.TM |
The optimal accumulated rainfall for anu.TM. Must be a object of class |
VI.index |
the index of the CTSR.VI ts that the anu.VI values occur at. Must be the same length
as anu.VI. NOTE. R indexs from 1 rather than 0.
if VI.index=FALSE, it will be calculated from the CTSR.VI using |
rf.b4 |
If a breakpoint in the VPR is detected this is the optimial accumulated rainfall before
the breakpoint. must be the same length as the anu.VI. If ACP.table is provided it will
be generated using |
rf.af |
If a breakpoint in the VPR is detected this is the optimial accumulated rainfall after
the breakpoint. must be the same length as the anu.VI. If ACP.table is provided it will
be generated using |
sig |
Significance of all the functions. defualt sig=0.05 |
season |
See |
exclude |
A numberic vector containg months excluded from breakpoint detection. This was included to allow sensor transitions to be masked. |
allow.negative |
If true, will not preference positive slope in either CTSR or VI calculations. default=FALSE is set because negative associations between rainfall and vegetation in water limited ecosystems is unexpected If temperature data is included then this paramter is forced to TRUE. |
allowneg.retest |
default=FALSE If temperature data is provided but found to not be significant then a retest is performed. This paramter is to allow negative on re-test. |
h |
See |
retnonsig |
Bool. New in v0.3.0. Allows TSSRESTREND to return change estimates of values that filed the sig component in the residual analysis. defualt FALSE will give the same result as eralier versions. |
Value
An object of class 'TSSRESTREND'
is a list with the following elements:
- summary
-
- Method
The method used to determine total change. (RESTREND see
RESTREND
, segmented.RESTREND seeseg.RESTREND
, segmented.VPR seeseg.VPR
)- Total.Change
The total significant change. Residual.Change + VPR.HeightChange.
- Residual.Change
The change in the VPR Residuals over the time period
- VPR.HeightChange
The change in VI at mean rainfall for a "ts" with a significant breakpoint in the VPR
- model.p
p value of the regression model fitted to the VPR. See
lm
- residual.p
p value of the regression model fitted to the VPR Residuals. See
lm
- VPRbreak.p
the p value associated with the break height. See
lm
- bp.year
The Year of the most significant breakpoint
- ts.data
The Time series used in analysis. See Arguments for description
CTSR.VI
CTSR.RF
anu.VI
VI.index
acu.RF
StdVar.RF see
seg.VPR
)
- ols.summary
-
- chow.summary
summary of the most significant breakpoint.
- chow.ind
Summary of every detected breakpoint
- OLS.table
A matrix containing the coefficents for the CTS.fit, VPR.fit, RESTREND.fit and segVPR.fit
- TSSRmodels
Note
if ACP.table = FALSE, CTSR.RF and acu.RF must be provided as well as
rf.b4 and rf.af for 'ts'
with a breakpoint in the VPR.
Author(s)
Arden Burrell, arden.burrell@unsw.edu.au
See Also
Examples
## Not run:
#To get the latest version of the package (Still in development)
install.packages("devtools")
library("devtools")
install_github("ArdenB/TSSRESTREND", subdir="TSS.RESTREND")
library(TSS.RESTREND)
#Find the path of the rabbitRF.csv dataset, read it in and turn it into a time series
rf.path<- system.file("extdata", "rabbitRF.csv", package = "TSS.RESTREND", mustWork = TRUE)
in.RF <- read.csv(rf.path)
rf.data <- ts(in.RF, end=c(2013,12), frequency = 12)
#Find the path of the rabbitVI.csv dataset and read it in
vi.path <- system.file("extdata", "rabbitVI.csv", package = "TSS.RESTREND", mustWork = TRUE)
in.VI <- read.csv(vi.path)
CTSR.VI <- ts(in.VI, start=c(1982, 1), end=c(2013,12), frequency = 12)
#Define the max accumuulation period
max.acp <- 12
#Define the max offset period
max.osp <- 4
#Create a table of every possible precipitation value given the max.acp and max.osp
ACP.table <- climate.accumulator(CTSR.VI, rf.data, max.acp, max.osp)
results <- TSSRESTREND(CTSR.VI, ACP.table)
print(results)
plot(results, verbose=TRUE)
## End(Not run)
Vegetation change attribution using the Time Series Segmentation of Residual Trends (MAIN FUNCTION)
Description
This is a wrapper function around the TSS-RESTREND main function that dows additional attribution. It measues the Observed vegetation change, land use, climate change and climate varibility. Unlike TSSRESTREND function, this requires both temperature and precitation data fo work.
Usage
TSSRattribution(
CTSR.VI,
CTSR.RF,
CTSR.TM,
max.acp,
max.osp,
C4frac = 0,
sig = 0.05,
season = "none",
exclude = 0,
allow.negative = FALSE,
allowneg.retest = FALSE,
h = 0.15,
returnmodels = FALSE,
AnnualRes = FALSE,
SkipError = TRUE,
retnonsig = TRUE,
splitclim = TRUE,
cliwindow = 20,
CO2 = FALSE,
refyear = 1980
)
Arguments
CTSR.VI |
Complete Monthly Time Series of Vegetation Index values.
An object of class |
CTSR.RF |
Complete Time Series of Rainfall. An object of class 'ts' object without NA's
and be the same length and cover the same time range as CTSR.VI.
If ACP.table is provided, CTSR.RF will be automitaclly calculated using the
|
CTSR.TM |
Complete Time Series of temperature. An object of class 'ts' object without NA's
and be the same length and cover the same time range as CTSR.VI. Default (CTSR.TM=NULL).
If ACT.table is provided, CTSR.RF will be automitaclly calculated using the
|
max.acp |
The max accumuation period. Must be an integer > 1. |
max.osp |
The max offset period. Must be an integer >1 |
C4frac |
The fraction of vegetation that follows the C4 photosynthetic pathway, between 0 and 1 |
sig |
Significance of all the functions. defualt sig=0.05 |
season |
See |
exclude |
A numberic vector containg months excluded from breakpoint detection. This was included to allow sensor transitions to be masked. |
allow.negative |
If true, will not preference positive slope in either CTSR or VI calculations. default=FALSE is set because negative associations between rainfall and vegetation in water limited ecosystems is unexpected If temperature data is included then this paramter is forced to TRUE. |
allowneg.retest |
default=FALSE If temperature data is provided but found to not be significant then a retest is performed. This paramter is to allow negative on re-test. |
h |
See |
returnmodels |
Return all the created models as well as the original data |
AnnualRes |
Report results in change per year. Defualt is False. Instead reports total change from the start to the end of the time series. |
SkipError |
Bool, If TRUE will handle most errors and return a dataframe filled with NA's. Usefull when processing large datasets to stop analysis failing on a single pixel. Use with caution. Defualt=TRUE |
retnonsig |
Bool. New in v0.3.0. Allows TSSRESTREND to return change estimates of values that filed the sig component in the residual analysis. defualt FALSE will give the same result as eralier versions. |
splitclim |
Bool, If TRUE Climate will be split into climate change and climate varibility as per Burrell et al., (2020). If FALSE. will just return climate as per IPCC: Chapter 3: Desertification in the IPCC Special Report on Climate Change, Desertification, Land Degradation, Sustainable Land Management, Food Security, and Greenhouse gas fluxes in Terrestrial Ecosystems. Defualt=True. |
cliwindow |
The size of the window in years to be used for calculating climate change. |
CO2 |
A timeseries containg the CO2 concentration. The defualt is CMIP5 RCP8.5 |
refyear |
The Year that acts as a baseline for CO2. All vegetation values will be scaled # to the CO2 concentration of this year. Defulat is 1980. THis function will pick the first value in the selected year, |
Value
tacp The accumulation period for the annual max time series temperature
Author(s)
Arden Burrell, aburrell@whrc.org
BFAST Breakpoint Detector
Description
takes the Complete VI and optimally accumulated Rainfall (and tmperature if included), calculates a lm
between them
And then performs a bfast
.in the residuals. If BFAST.raw=TRUE, it will perform bfast on the Complete VI ts
Usage
VPR.BFAST(
CTSR.VI,
CTSR.RF,
CTSR.TM = NULL,
season = "none",
BFAST.raw = FALSE,
h = 0.15
)
Arguments
CTSR.VI |
Complete Monthly Time Series of Vegetation Index values.
An object of class |
CTSR.RF |
Complete Time Series of Rainfall. An object of class 'ts' object without NA's
and be the same length and cover the same time range as CTSR.VI.
If ACP.table is provided, CTSR.RF will be automitaclly calculated using the
|
CTSR.TM |
Complete Time Series of temperature. An object of class 'ts' object without NA's and be the same length and cover the same time range as CTSR.VI. Default (CTSR.TM=NULL). |
season |
See |
BFAST.raw |
Defualt = FALSE If TRUE will perform a BFAST (season="harmonic") on the CTSR.VI If FALSE will perform BFAST on the CTSR VPR residuals |
h |
See |
Value
List of objects:
bkps The index of the Breakpoints detected. If no breakpoints are detected, bkps = FASLE
BFAST.obj
See bfast
CTS.lm
the lm
of CTSR.VI and CTSR.RF
BFAST.type the type of BFAST done (VPR residuals or on the VI timeseris itself)
Author(s)
Arden Burrell, arden.burrell@unsw.edu.au
Examples
## Not run:
VPRBFdem <- VPR.BFAST(segVPRCTSR$cts.NDVI, segVPRCTSR$cts.precip)
print(VPRBFdem)
## End(Not run)
Climate Accumulator
Description
Takes the time series of rainfall and returns a rainfall accumulation table of every possible combination of the max accumulation period and the max offset period.
Usage
climate.accumulator(
CTSR.VI,
clim.data,
max.acp,
max.osp,
temperature = FALSE,
cliwindow = 0
)
Arguments
CTSR.VI |
Complete Time Series of Vegetation Index. An object of class |
clim.data |
Complete Time Series of monthly rainfall or temperature. An object of class |
max.acp |
The max accumuation period. Must be an integer > 1. |
max.osp |
The max offset period. Must be an integer >1 |
temperature |
Bool. If the clim.data being accumulated is temperature, will take a mean not a sum. This makes it easier to comapare regions with different accumulation and offset periods. This is new in v0.3.0. Defualt=FALSE which replicates the behaviour of TSSRESTREND versions <0.2.16. |
cliwindow |
The size of the window in years to be used for calculating climate change. |
Value
ACP.table A matrix with ever possible accumuated climate combination
Examples
# Define the max accumuulation period
acp <- 12
#Define the max offset period
osp <- 4
rftable <- climate.accumulator(segRESTRENDCTSR$cts.NDVI, segRESTRENDctRF$precip, acp, osp)
Franks CO2 Vegetation correction
Description
Adjusts a vegetation time series to account for CO2 fertilisation
Usage
franksCO2(CTSR.VI, C4frac, CO2 = FALSE, refyear = 1980)
Arguments
CTSR.VI |
Complete Monthly Time Series of Vegetation Index values.
An object of class |
C4frac |
The fraction of vegetation that follows the C4 photosynthetic pathway, between 0 and 1 |
CO2 |
A timeseries containg the CO2 concentration. The defualt is CMIP5 RCP8.5 |
refyear |
The Year that acts as a baseline for CO2. All vegetation values will be scaled # to the CO2 concentration of this year. Defulat is 1980. THis function will pick the first value in the selected year, |
Value
CTSR.VIadj A version of the CTSR.VI data that has been adjusted to account for CO2
Author(s)
Arden Burrell, aburrell@whrc.org
Plot Function for ojects of the TSSRESTREND class
Description
Produces plots for class TSSRESTREND
Usage
## S3 method for class 'TSSRESTREND'
plot(x, plots = "all", sig = 0.05, ...)
Arguments
x |
Object of class TSSRESTREND |
plots |
Defualts to "all", will produce the standard plots, plots can be called individually, "bfast", "chow", "VPR", "anu.VI", "final". |
sig |
Significance |
... |
further arguments passed to the function. |
Print function for class TSSRESTREND
Description
print function for objects of class TSSRESTREND
Usage
## S3 method for class 'TSSRESTREND'
print(x, ...)
Arguments
x |
Object of class TSSRESTREND |
... |
further arguments passed to the function. |
Rabbit Impacted Vegetation Precipitation Accumulation Table
Description
Rainfall Accumulation Table form a part of the Simpson-sStrzelecki Dunefields bioregion impacted by reduced rabbit predation after the release of RHD.
Usage
rabbitACPtable
Format
A matrix containing the complete time series of every acp and ofp. See climate.accumulator
for details
Source
Awap data from http://www.csiro.au/awap/cgi/awap2.pl
Examples
data(rabbitACPtable)
Segmented RESTREND (RESidual TREND)
Description
For ts with a significant breakpoints in the residuals but not in the VPR. Takes annual VI max and it associated optimal accumulated precipitation and regresses it with a dummy variable that is 0 before the breakpoint and 1 after it
Usage
seg.RESTREND(
anu.VI,
acu.RF,
VI.index,
breakpoint,
acu.TM = NULL,
sig = 0.05,
retnonsig = FALSE
)
Arguments
anu.VI |
The annual (Growing season) max VI. Must be a object of class |
acu.RF |
The optimal accumulated rainfall for anu.VI. Must be a object of class |
VI.index |
the index of the CTSR.VI ts that the anu.VI values occur at. Must be the same length
as anu.VI. NOTE. R indexs from 1 rather than 0.
if VI.index=FALSE, it will be calculated from the CTSR.VI using |
breakpoint |
The index of the most significant breakpoint as determined using |
acu.TM |
The optimal accumulated rainfall for anu.TM. Must be a object of class |
sig |
Significance of all the functions. defualt sig=0.05 |
retnonsig |
Bool. New in v0.3.0. Allows TSSRESTREND to return change estimates of values that filed the sig component in the residual analysis. defualt FALSE will give the same result as eralier versions. |
Value
a list of class TSSRESTREND.
See TSSRESTREND
for details. Note. if called seperatly from TSSRESTREND,
this list will be incomplete.
Author(s)
Arden Burrell, arden.burrell@unsw.edu.au
Examples
# brkp can be determined using VPR.BFAST and CHOW.
brkp <- as.integer(11)
resu <- seg.RESTREND(segRESTREND$max.NDVI, segRESTREND$acc.precip, segRESTREND$index, brkp)
Segmented Vegetation Climate Relationship
Description
For a ts with a significant breakpoints in the the VPR/VCR. This function takes annual VI max, the optimal accumulated precipitation (& temperature) before and after the breakpoint, then caculates the Standard Variance of the climate cariables.Theen an OLS is performed with a dummy variable to reperesent the breakpoint (0 before the breakpoint and 1 after it)..
Usage
seg.VPR(
anu.VI,
acu.RF,
VI.index,
breakpoint,
rf.b4,
rf.af,
acu.TM = NULL,
tm.b4 = NULL,
tm.af = NULL,
sig = 0.05,
retnonsig = FALSE
)
Arguments
anu.VI |
The annual (Growing season) max VI. Must be a object of class |
acu.RF |
The optimal accumulated rainfall for anu.VI. Must be a object of class |
VI.index |
the index of the CTSR.VI ts that the anu.VI values occur at. Must be the same length
as anu.VI. NOTE. R indexs from 1 rather than 0.
if VI.index=FALSE, it will be calculated from the CTSR.VI using |
breakpoint |
The index of the most significant breakpoint as determined using |
rf.b4 |
If a breakpoint in the VPR is detected this is the optimial accumulated rainfall before
the breakpoint. must be the same length as the anu.VI. If ACP.table is provided it will
be generated using |
rf.af |
If a breakpoint in the VPR is detected this is the optimial accumulated rainfall after
the breakpoint. must be the same length as the anu.VI. If ACP.table is provided it will
be generated using |
acu.TM |
The optimal accumulated rainfall for anu.TM. Must be a object of class |
tm.b4 |
If a breakpoint in the VCR is detected this is the optimial accumulated temperature before
the breakpoint. It must be the same length as the anu.VI. If ACT.table is provided it will
be generated using |
tm.af |
If a breakpoint in the VCR is detected this is the optimial accumulated temperature after
the breakpoint. It must be the same length as the anu.VI. If ACT.table is provided it will
be generated using |
sig |
Significance of all the functions. defualt sig=0.05 |
retnonsig |
Bool. New in v0.3.0. Allows TSSRESTREND to return change estimates of values that filed the sig component in the residual analysis. defualt FALSE will give the same result as eralier versions. |
Value
a list of class TSSRESTREND.
See TSSRESTREND
for details. Note. if called seperatly from TSSRESTREND,
this list will be incomplete.
Author(s)
Arden Burrell, arden.burrell@unsw.edu.au
Examples
brkp <- as.integer(24) #calculated using th CHOW (DONTRUN) example
VPRres <- seg.VPR(segVPR$max.NDVI, segVPR$acum.RF, segVPR$index, brkp, segVPR$RFB4, segVPR$RFAF)
print(VPRres)
Data frame containing the annual data for a segRESTREND analysis
Description
contains anu.VI, acu.RF, VI.index, rf.b4, rf.af. Range 1982 - 2013. Breakpoint for this pixel is 24 (2005)
Usage
segRESTREND
Format
R data frame
Source
Data frame containing the Complete Times Series data for a segmented RESTREND analysis
Description
contains CTSR.VI and CTSR.RF. See TSSRESTREND
. Starts 1/1982 and extend to 12/2013
Usage
segRESTRENDCTSR
Format
R data frame
Source
a single pixel from monthlyComposite
See Also
stdRESTREND
for the annual values for the same pixel
Data frame containing the raw rainfall data set for the segRESTREND data, ending dec 2013 with a frquency of 12
Description
contains raw monthly precipitation
Usage
segRESTRENDctRF
Format
R data frame
Source
Awap data from http://www.csiro.au/awap/cgi/awap2.pl
See Also
stdRESTREND
for the annual values for the same pixel
Precipitation Accumulation Table for the segRESTREND demonstration pixel
Description
Rainfall Accumulation Table
Usage
segRESTRENDrfTab
Format
A matrix containing the complete time series of every acp and ofp. See climate.accumulator
for details
Source
Awap data from http://www.csiro.au/awap/cgi/awap2.pl
Data frame containing the annual data for a segVPR analysis
Description
contains anu.VI, acu.RF, VI.index, rf.b4, rf.af. Range 1982 - 2013. Breakpoint for this pixel is 24 (2005)
Usage
segVPR
Format
R data frame
Source
Data frame containing the Complete Times Series data for a segmented VPR (VEGETATION PRECIPTATION RELATIONSHIP) analysis
Description
contains CTSR.VI and CTSR.RF. See TSSRESTREND
. Starts 1/1982 and extend to 12/2013
Usage
segVPRCTSR
Format
R data frame
Source
a single pixel from monthlyComposite
See Also
stdRESTREND
for the annual values for the same pixel
Data frame containing the raw rainfall data set for the segVPR data, ending dec 2013 with a frquency of 12
Description
contains raw monthly precipitation
Usage
segVPRctRF
Format
R data frame
Source
Awap data from http://www.csiro.au/awap/cgi/awap2.pl
See Also
stdRESTREND
for the annual values for the same pixel
Precipitation Accumulation Table for the segVPR demonstration pixel
Description
Rainfall Accumulation Table
Usage
segVPRrfTab
Format
A matrix containing the complete time series of every acp and ofp. See climate.accumulator
for details
Source
Awap data from http://www.csiro.au/awap/cgi/awap2.pl
Data frame containing the annual data for a standard Restrend analysis
Description
contains anu.VI, acu.RF and VI.index. Range 1982 - 2013
Usage
stdRESTREND
Format
R data frame
Source
Data frame containing the Complete Times Series data for a standard Restrend analysis
Description
contains CTSR.VI and CTSR.RF. See TSSRESTREND
. Starts 1/1982 and extend to 12/2013
Usage
stdRESTRENDCTSR
Format
R data frame
Source
a single pixel from monthlyComposite
See Also
stdRESTREND
for the annual values for the same pixel
Data frame containing the raw rainfall data set ending dec 2013 with a frquency of 12
Description
contains raw monthly precipitation
Usage
stdRESTRENDctRF
Format
R data frame
See Also
stdRESTREND
for the annual values for the same pixel
Precipitation Accumulation Table for the standard RESTREND demonstration pixel
Description
Rainfall Accumulation Table
Usage
stdRESTRENDrfTab
Format
A matrix containing the complete time series of every acp and ofp. See climate.accumulator
for details
Source
Awap data from http://www.csiro.au/awap/cgi/awap2.pl