I have AVHRR NDVI weekly data for 1981-2014, but I need a monthly value for NDVI. Since for one year I have 52 files, which I want to convert in monthly means but how can I do that? If I take 4 weeks per month then 52/4 = 13 months. What is the proper way to do it?
Michel M. Verstraete
Dear Muhammad,
I assume you know exactly which days are actually contributing to each of the weekly mean NDVI values you have. The simplest solution would be to compute a weighted average of the weekly values that contribute to a given month, where the weight of each weekly value is given by the number of days in that week that happen to overlap with that month. You can then repeat the exercise for each successive month in your time series.
I hope this helps. Cheers, Michel.
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