filter_qa: Filter with QA Band
In irg: Instantaneous Rate of Green Up

Description Usage Arguments Details Value See Also Examples

Using QA band information, filter the NDVI time series.

1	filter_qa(DT, ndvi = "NDVI", qa = "SummaryQA", good = c(0, 1))

`DT`	data.table of NDVI time series
`ndvi`	ndvi column name. default is 'NDVI'.
`qa`	QA column. default is 'SummaryQA'.
`good`	values which correspond to quality pixels. default is 0 and 1.

See the details for the example data in ?sampled-ndvi-Landsat-LC08-T1-L2.csv and ?sampled-ndvi-MODIS-MOD13Q1.csv

For MODIS MOD13Q1, the SummaryQA band

For Landsat

filtered data.table with appended 'filtered' column of "quality" NDVI.

Other filter: filter_ndvi(), filter_roll(), filter_top(), filter_winter()

# Load data.table
library(data.table)

# Read example data
ndvi <- fread(system.file("extdata", "sampled-ndvi-MODIS-MOD13Q1.csv", package = "irg"))

filter_qa(ndvi, ndvi = 'NDVI', qa = 'SummaryQA', good = c(0, 1))