Cloud shadows show rectangular artifacts

[lnicola]

Hello. We noticed some rectangular artifacts in the masks producted by Fmask 4.4, for example:

(S2B_MSIL1C_20200112T111329_N0208_R137_T30TUN_20200112T114220.SAFE)

The thresholds in the command line were 3 3 0 10.

Fmask 4.4 start ...
Cloud/cloud shadow/snow dilated by 3/3/0 pixels.
Cloud probability threshold of 10.00%.
Load or calculate TOA reflectances.
Detect potential clouds, cloud shadows, snow, and water.
Match cloud shadows with clouds.
Fmask 4.4 finished (31.75 minutes)
for L1C_T30TUN_A014892_20200112T111437 with 41.29% clear pixels

I haven't looked too closely, but I suspect we don't have the auxiliary data installed correctly. Still, filing this now for future reference and in case anyone else runs into the same problem.

[lnicola]

This was indeed caused by the missing auxiliary data. There's no complaint in the log, but I guess 4.4 was silently updated to add that warning.

If you've ran into this problem, note that the 4.6 package has a copy of run_Fmask_4_4.sh that you're supposed to copy to /usr/GERS/Fmask_4_6/application. Don't forget to do that, but the script is still wrong because it puts the path at the start of the arguments, not at the end, see #22 (comment).