[R-sig-Geo] How to export a GeoTIFF 8 bit raster

[Rik Ferreira]

Hello!

How a raster image can be exported as a 8 bit GeoTIFF image?

I'm downloading a 8 bit image from this link:
http://geoinfo.cnps.embrapa.br/documents/2918/download, cropping it with a
vector mask, treating it, and exporting it with terra package (writeRaster
function).

However, the original image is a GeoTIFF with 8 bit depth but the output
image (terra package, writeRaster function) is a 32 bit image.

I can control it with `gdal = "NBITS=8"` argument to writeRaster but i get
such warning:

Warning message:
> In x using ptr$writeRaster(opt) :
>   GDAL Message 6:
> /mnt/HDD/STORAGE/r-projects/raster-bit-depth/output/recorte.tif: Only
> NBITS=16 is supported for data type Float32
>

How can I export this raster as a 8 bit GeoTIFF image with terra package?

-- 
Rik Ferreira Alves
Graduando em Geografia - Unimontes
https://rikferreira.netlify.app/

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