tidy_MOD13

Source: R/tidy_MODIS.R

Tidy MODIS 'MOD13' VI products' (e.g. MOD13A1, MOD13A2, ...) raw data exported from Google Earth Engine. Tidy contents include:

  1. add exact compositing date, see getRealDate().

  2. Init weigths according SummaryQA, see qc_summary(). 

tidy_MOD13(infile, outfile, wmin = 0.2)

Arguments

infile

A character csv file path or a data.table

outfile

Output file name. If missing, will not be written to file.

wmin

Double, minimum weight of bad points, which could be smaller the weight of snow, ice and cloud.

Value

A tidied data.table, with columns of 'site', 'y', 't', 'w', 'date' and 'SummaryQA'.

  • site: site name

  • y: real value of EVI, [-1, 1]

  • date: image date

  • t: exact compositing date constructed from DayOfYear

  • w: weights

  • SummaryQA: A factor, QA types, one of "good", "margin", "snow/ice" or "cloud".

Examples

library(phenofit)
data("MOD13A1")
dt <- tidy_MOD13(MOD13A1$dt)