On 05/01/2026 19:47, rayg wrote:
Strange encoding, -10000 meters isn't deep enough for the Marianas
Trench. You could borrow another 10 km from the 1.6 million meters
still available on the positive side.
Scaling by 0.1 also means a 10 cm vertical resolution., which is
useless for some use cases. The 24 bits per pixel could be much better
allocated.
I kind of agree with both points, but I guess the format is what it is.
I don't think it's supposed to be a general-purpose storage format. It's
encoding just enough data to do good enough real-time visualization of
elevation, like hillshading or hypsometric tints, client side.
Looks like at least rio-rgbify [1] allows setting a custom base value
and interval. That might be something we want to emulate as well,
perhaps as creation options (if a raster format driver) or command line
options (if part of gdaldem).
- Lars
[1] https://github.com/mapbox/rio-rgbify
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