Temporal processing with multiple scenes

#1

Hello,

I want to analyse the standard deviation of the NDVI index for one given month on for multiple years (the maximum is the better, 20 years of MODIS is the best).

I need all the scenes of a given month for the maximum number of years. It make, with one per day, 30x20 = 600 scenes.
I think I can reduce this a bit, like 15x20 or 10x20.

I did a script respecting the optimisation recommandation the best as I can. It is here : https://raw.githubusercontent.com/Dessoul/ibisa-eo/master/Modis/NDVISD.js
The problem is that it do not work with more than some years (~4). After, I get a 504 Gateway Time-out

Is there a way to make it run on more historical data ?
How frustrating it is to have 20 years but only use 4 :slight_smile:

Thank you !

#2

Hi @ibisa,
I feel you are pushing our system a bit too far…
I suggest you split requests in a yearly ones and then do the last step of statistical analysis on your server.
Best,
Grega