[gdal-dev] lines when combining dems from different sources

[Andrew Calcutt]

I am trying to take several dem sources and merge them together using VRTs,
then I am using rio rgbify to make terrainrgb tiles The script I am using
looks like
https://github.com/acalcutt/terrain_merged/blob/main/create_terrainrgb.sh

Basically, I am trying to layer 3 sources
-JAXA (full planet but lower quality)
-TINITALY (slightly better quality)
-SWISSALTI (best quality)
Then using the ordering of the filelist into a final VRT to layer them in
the correct order

However when I try this, the layering seems to work, but I end up with lots
of added lines, like this example
https://stackblitz.com/edit/web-platform-wrcpum?file=index.html

Can anyone suggest how I might fix these lines when combining these
different source files? I have tested different resampling methods but it
doesn't seem to be related to that. When I do the sources individually, I
don't have those lines (see this example which is just jaxa
https://stackblitz.com/edit/web-platform-al1zf5?file=index.html )

Note: This relates to a question in one of my own repos that I am looking
into https://github.com/acalcutt/jaxa_AW3D30_to_MBTiles/issues/3 .
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