Tile pattern removal ?

[fpglt]

Often tiles show a sort of regular pattern superimposed on the "true" image. I wonder if it can be removed by some treatment. I think FFT could do the trick given the highly regular character of the pattern but I suppose it's too CPU intensive ?

[karlrado]

A screenshot would really useful here.

[fpglt]

See the grid like pattern ? It's more or less obvious depending on the tiles.

[karlrado]

I'm pretty sure those are JPEG compression artifacts. The pattern is appearing in the low-frequency part of the image and is more apparent in the flatter sections. This Wikipedia article describes it pretty nicely.

My first reaction is that this seems pretty minor compared to other flightsim imagery issues. Maybe a higher ZL would help? Or maybe a different satellite imagery provide that may compress their JPEGs differently?

And yes, maybe there are filters that could be applied to take some of this out, but as you suspect, AO is already pretty heavy on the CPU.

[fpglt]

I never realized but it may be my setup. Since 2.0 some tiles are regularly missing and they also show this pattern, though there is no reason for it t least on AO side (I suppose they should be in plain color). So it may be some artifact caused by my scenery ?
See screenshot, it's difficult to perceive but the grid extends outside the green missed tile.
EDIT : I ran a test with all scenery disabled but AO. Same result. So I am at loss here.

[fpglt]

It's not AO side but an XPlane feature, see discussion here: https://www.reddit.com/r/Xplane/s/mYujISeDX3
EDIT: according to LR answer on Reddit it is indeed in the hands of the ortho provider.