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I have a raster data and i want to set the 0 value pixels to NoData using GDAL in python API.

I know that you can do this by inputting this code in the command prompt.

gdal_translate -of GTiff -a_nodata 0 input.tif output.tif

but can anyone translate this so that i can put it in a Python API?

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    A bit unclear what you mean, but you can gdal.Translate("output.tif", "input.tif", format="GTiff", noData=0) is equivalent to your command.
    – Jose
    Sep 10 at 11:04
  • Hello @Jose. Thanks for this, this is exactly what I needed. Sep 11 at 8:42
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I would recommend to use gdal_edit.py script https://gdal.org/programs/gdal_edit.html or study the code and re-use in your own script.

-a_nodata <value>
Assign a specified nodata value to output bands.

Gdal_translate creates a new copy from your tif while gdal_edit updates just the GeoTIFF metadata in-place.

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  • Hello. Thank you for this, this may be a better alternative to gdal.translate. May I ask how to do this code in a python API? Im sorry, im terrible in translating code from command line to python api. Thank you so much! Sep 11 at 10:29
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You can do this with rasterio (GDAL python wrapper) using r+ mode:

import rasterio

with rasterio.open(file, 'r+') as rds:
    rds.nodata = 0
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  • Hello! Thank you for this. Will try it out. Sep 11 at 10:29

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