I would like to calculate cloud area in the sentinel image (absolute and relative). I have cloud mask from 2A product downloaded from scihub and I also calculated cloud mask by Idepix modul. I would like to calculate cloud area from one of these cloud masks in absolute values ( e.g. 100 km2) and relative values (e.g. 10 % of the whole image). How could I do that ? I found out about mask area modul, but there is only one absolute value, no information about total area.
I would like also to ask how could I export these cloud masks if I want to use them in QGIS for further analysis and processing.
Thanks.
To get the relative value you can create a new mask which contains all pixels (Mask Manager and create new mask with expression âtrueâ) and then compute the area for this mask, with both values you can compute the relative value.
You can export the cloud masks by converting them into bands, for example.
use the Band Maths create a new band named e.g. âcloud_bandâ, disable the virtual band option in the dialog and as expression simply use the mask name.
Afterwards you can create a subset that only contains this new band and then you can export it.
Ce que je ne sais pas faire, câest appliquer ce fichier de masques sur mes images pour enveler les nuages de mes images afin de calculer mes indices sans nuages sur les images.
En effet, je travaille sur qgis.