unfortunately it didn’t help 
This appears in every flight in large areas for several months now. Even FS2004 had better ground textures. That’s very annoying.
If it were at least possible to download the ground textures using the Manual Cache, then I wouldn’t have a problem. But this function is not possible. The Manual Cache apparently only stores photogrammetry data, aside from the fact that it has now completely broken down, and you can’t even create a Manual Cache file anymore.
That screenshot was before SU15. and they fixed ground tiles since then. Can you get an updated screenshot?
first noticed in 1.35.21.0 (SU 14) persisting in 1.37.18.0 (SU 15)
Look at that location in bing maps to see if the satellite does the same thing
What is your download/upload speed?
Defenetly not. Its popping. It’s not baked into the Image. Seems to be a LOD issue.
16 Mbit DN and 1 Mbit UP. Was never a problem, always worked fine. Connection is tested stable as well.
The only reason I ask is because I had a 30mbit connection and experienced blurry textures occasionally as you describe. I recently upgraded to 500mbit connection which has totally changed the sim. Everything is crystal clear now. I do have a 4090 so plenty of vram to suck up all those textures though. I am certain that the sim assesses total bandwidth and scales the textures download to suit. My 30mbit connection wasn’t always consumed with MSFS yet clearly some bandwidth management algorithms takes effect within the sim. Just a theory, but in my case the upgraded connection was the only thing that changed.
I’m upgrading to 500 Mbit on June 27th 
You gave me Hope
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However, it is strange that in free drone flight, when the aircraft remains on the ground, the problem is reproducibly absent at the highest camera speed. I can’t make sense of it.
What processor do you have?
AMD Ryzen 7 7800X3D | 8x 4,2GHz, 96MB L3
I’ve noticed that the problem with blurry ground textures only happens in live weather mode, which is quite strange.
Recently (around the PMDG release) the quality of ortho resolution is declining. Idk if they went out of money for their servers or sth. but it was way better earlier this year. With TOD at 300-400 you could get pretty good ZL ortho but now its a blurry mess again.
OP, check some of my posts. I’m experiencing the exact same issues on both PC and Xbox no matter where I fly in the world, weather conditions of time of day.
However, if you turn off both live weather and live AI traffic, it might help things a little.