Re: Experimental DSM-based terrain renderer with streamed orthophotos

Oh, that might be interesting. So one query to a WMTS server would return all the LODs, or would you still have to make individual requests for each one?

Also, I suppose a solution to this might be to have orthos download as LODs become visible. This might not work as all the LODs for a single tile are downloaded at once IIRC, but it might be something that can work a bit differently.


________________________________
From: Stuart Buchanan <[email protected]>
Sent: Tuesday, June 2, 2026 09:03
To: FlightGear developers discussions <[email protected]>
Subject: Re: [Flightgear-devel] Experimental DSM-based terrain renderer with streamed orthophotos

Hi,

On Tue, Jun 2, 2026 at 4:27 PM Israel Emmanuel <[email protected]<mailto:[email protected]>> wrote:
<snip>
WS3, on the other hand, has LOD in its scenery, with 1x1 degree tiles being broken up into 16x16 grids. While you'll only ever be rendering 4 tiles at the maximum (if you're at a corner, for example), each one of those tiles will require 1024 requests for the highest levels of detail. Even rendering one tile at a time, this is not something that can be reasonably kept up with. Querying the ortho server fast enough to keep up with TerraSync will inevitably result in 504s for most requests, and now you have snaggletoothed terrain rendering. If you pace your requests to not overload the server, you are now waiting several minutes to download a single tile of scenery. That's alright if you're downloading ahead of time, but unusable if you're trying to download on the fly.

I understand that WMTS supports LoD natively.  So WS3.0 would simply request a WMTS ortho tile at an LoD appropriate for the WS3.0 LoD level.  I anticipate that the tile scheme won't match perfectly, one might have to load multiple tiles, but that should be manageable.

-Stuart

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