Hello, I was taking a look at options & flags section of webodm page, and find the “build-overviews” flag which seems interesting to me.
I noticed at the top the banner that some options are not visible in webodm, but what about this one? I’ve never tried this option so I don’t know if this can help (JPEG geotiffs in my QGIS are slow to render when zooming in/out, I switched to raw geotiffs to speed up)
Thank you 🙂
It's not visibible in WebODM because --cog (which implicitly does the same as building overviews) is always turned on with WebODM. At some point we'll probably remove it, because COGs basically achieve the same result.
One problem currently is that TIFFs exported with WebODM are not COGs, this will get improved and we're tracking it with https://github.com/WebODM/WebODM/issues/1847
Thank you Piero
So if I understood well, tiffs in webodm are not yet optimized and this will be achieved in the future with —cog, right? In other words, geotiff rendering performance will increase when this is solved?
Exported TIFFs (other than the raw TIFF) are not optimized as COGs, correct. The raw TIFF is optimized though
If display speed is an issue with output from WebODM to QGIS what is it specifically that you are referring to?
Ortho output?
If this is an issue you can generate tiles as part of the output options in your task settings. I think it is off by default.
When I export a GeoTIFF (RGB) and open in QGIS, the rendering speed every time i zoom in/out or when I pan is slow. The rendering speed when I export a GeoTIFF as RAW is much better, at the cost of a bigger size. I’m sorry I previously referred to as JPEG GeoTIFFs, which doesn’t make much sense. Actually I was referring to RGB GeoTIFFs (which are compressed)
I noticed that function (-build overviews) which is described to be an option that should increase rendering speed, so I thought it was exactly what I’m looking for 🙂
Nice, so that’s the reason why I noticed a big difference in rendering time between two geotiffs formats! So I would expect the same boost performance once —cog will be correctly implemented 🙂
Best answer
This is what I was referring to.
Also 3D tiles.
QGIS can read tile output
Or you can use QGIS to build your image pyramids for faster display on your ortho.
Hope this is helpful.
Thank you very much, I’m not that familiar with QGIS (I’m a total newbie), so I will take a look for sure 🙂
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