Hello:
I have no knowledge of any MSFS Betas, but IIRC the zoom level for default aerial imagery was 20 (even though IRL we still do not see that resolution available in the public domain very often...
yet).
I recall wondering when I saw that in SDK Docs: how did MS suddenly come into possession of enough zoom level-20 imagery to cover the MSFS world ?
My speculative conclusion was that MSFS 2020 imagery is actually over-sampled.
Since most of what I see in Google Earth seems to be Zoom level-18 with nearly everything Zoom level-19 or higher apparently resampled, and since most- but not all- MS Virtual 'Earth' (aka "MSVE") / BING seems to be the same or even lesser pixel resolution, the possibility of widespread oversampling to cover the MSFS world would not be surprising to me.
Remembering "Zoom Level" is closer to QMID than to LOD in the MSVE / BING quad tile schema, and LOD+2=QMID, IIUC, the minimum LOD required to pre-empt display of MSFS default aerial imagery would match or exceed LOD-20 / QMID-22 at (3.75cm / 1.476378 inches), and perhaps even at LOD-21 / QMID-23 (1.875cm / 0.738189 inches) on the ground ...per pixel !
https://www.fsdeveloper.com/forum/threads/flattens.425495/post-633002
https://docs.flightsimulator.com/html/Samples_And_Tutorials/Samples/Sceneries/SimpleAerial.htm?rhhlterm=aerial aerials
"All image files for aerial images should be authored as 16bit PNG with a fixed size of 256x256px, and the build process will automatically generate the images for the lower levels of detail. Note that the alpha channel of the provided aerial image PNG is used to blend between the image and the in-game aerial, where a pixel with
alpha 0 means the in-game aerial pixel is used, and 1 means the provided (custom / 3rd party) ...aerial pixel is used. Any value in-between will create a linear interpolation between the in-game aerial and the provided aerial."
CAVEAT: Beware of how some applications interpret a 4th Band in NIR aerial imagery ...it may be interpreted as a
0 (Black) Alpha Channel
https://www.fsdeveloper.com/forum/t...from-usgs-has-all-water-colored-white.443890/
But perhaps I should test this personally to see if LOD-20 custom imagery with
alpha 0 is actually of sufficiently high resolution to achieve superimposition on default MSFS aerial imagery (or swapped-in 'default' MSFS land class) ...before speculating.
Speaking of the sim using "land class", I previously have seen MSFS 2020 rapidly toggle between what AFAIK was textures as bad- or worse- than FSX land class quality, and actual aerial imagery with the superimposed 'detail' texture, when the Azure (..."As You Were" ? / ..."Aw, Sure" ?) servers repeatedly flaked online and offline on 'A Bad Day' at MSFS in Multi-Player Mode.
IIRC, at the time, MSFS 2020 also popped up a status message acknowledging loss of connection with server, not being able to access content, and switching to locally cached content while still allowing MSFS to run.
I foresee major issues if MS attempts to prevent local access due to resolving authentication of license, or worse yet, an attempt to prevent use of cached or custom aerial imagery content from local disk, or proxy content (
ex: Google or other 3rd party) via online data streams.
Thankfully, I have noticed the improved appearance of many MSFS 2024 aerial imagery textures, and have wondered if MS is dynamically adding land class textures superimposed on top of the aerial imagery, and if so, how can we utilize those "land class enhanced' meta-objects for our own custom development purposes ...is there a MSFS 'Terrain.Cfg equivalent' with GUIDs we can access somewhere ?
GaryGB