phenofit (version 0.2.0)

getBits: Initial weights according to qc

Description

getBits

Extract bitcoded QA information from bin value

qc_summary

Initial weigths based on Quality reliability of VI pixel, suit for MOD13A1, MOD13A2 and MOD13Q1 (SummaryQA band).

qc_5l

Initial weights based on Quality control of five-level confidence score, suit for MCD15A3H(LAI, FparLai_QC), MOD17A2H(GPP, Psn_QC) and MOD16A2(ET, ET_QC).

qc_NDVIv4

For NDVIv4

qc_StateQA

Initial weights based on `StateQA`, suit for MOD09A1, MYD09A1.

Usage

getBits(x, start, end = start)
qc_summary(QA, wmin = 0.2, wmid = 0.5, wmax = 1)
qc_StateQA(QA, wmin = 0.2, wmid = 0.5, wmax = 1)
qc_5l(QA, wmin = 0.2, wmid = 0.5, wmax = 1)
qc_NDVIv4(QA, wmin = 0.2, wmid = 0.5, wmax = 1)

Arguments

x

Binary value

start

Bit starting position, count from zero

end

Bit ending position

QA

quality control variable

wmin

Double, minimum weigth (i.e. weight of snow, ice and cloud).

wmid

Dougle, middle weight, i.e. marginal,

wmax

Double, maximum weight, i.e. good,

Value

A list object with

weigths

Double vector, initial weights

QC_flag

Factor vector, with the level of c("snow", "cloud", "shadow", "aerosol", "marginal", "good")

Examples

# NOT RUN {
set.seed(100)
QA <- as.integer(runif(100, 0, 2^7))

r1 <- qc_summary(QA, wmin = 0.2, wmid = 0.5, wmax = 1)
r2 <- qc_StateQA(QA, wmin = 0.2, wmid = 0.5, wmax = 1)
r3 <- qc_5l(QA, wmin = 0.2, wmid = 0.5, wmax = 1)
r4 <- qc_NDVIv4(QA, wmin = 0.2, wmid = 0.5, wmax = 1)
# }