Can't get_raster_layer from a GeoTiff with Bind type with Int16 or Float16

[cyberpsyche]

I have a GeoTiff with only 1 Band and the Band type is Int16. If I execute img = Geodot.get_raster_layer("the_geo.tif") it cannot get a valid GeoRasterLayer even if the result of img.is_valid() if true. I have to translate the GeoTiff file to Band type Float32, then the execution will succeed.

But change the band type from Int16 to Float32 will make the Tiff file twice bigger. How can I do to handle this problem?

Thanks for your help !

[kb173]

Hi, thanks for the report!

Indeed it's currently a limitation that Int16 images aren't processed. The reason I haven't implemented this is because Godot doesn't support any Image format with 16-bit integer values: https://docs.godotengine.org/en/stable/classes/class_image.html#enumerations

Since I haven't had a use-case for such data, I wasn't sure how best to deal with this limitation. We could process it into an image with two 8-bit channels (FORMAT_RG8) which you could bit-shift back into integers in a custom shader. The problem with this is that interpolation will be problematic, since Godot would interpolate between the two channels separately, causing faulty results. Alternatively, we could process it into a 32-bit float image (FORMAT_RF), as if it were a Float32 input. This would work nicely with interpolation, but probably introduce some rounding inaccuracies.

Which behavior would you prefer with the data you're working with?