GF3 L1A to L2 Pipeline

This repository contains a Python package and CLI for converting GF3 L1A products to L2 GeoTIFF outputs.

The heavy work is still handled by GDAL, Rasterio, and NumPy. The package adds pipeline structure around the original script: explicit configuration, safe path handling, logging, restart-friendly skipping, per-scene error isolation, and block-based radiometric calibration.

Install

Use an environment that already has a working GDAL/OSGeo Python binding. On Windows, Conda/Miniforge is usually the least fragile route.

conda env create -f environment.yml
conda activate gf3-l1a2l2
pip install -e . --no-deps

Run

gf3-l1a2l2 run --input D:\GF3\L1A_BATCH --output E:\GF3\L2_Image --dem .\GMTED2010.jp2

Common options:

gf3-l1a2l2 run `
  --input D:\GF3\L1A_BATCH `
  --output E:\GF3\L2_Image `
  --dem .\GMTED2010.jp2 `
  --workers 1 `
  --x-res 0.0002 `
  --y-res 0.0002 `
  --dst-srs EPSG:4326

By default, output files are written under one subdirectory per discovered scene. Use --flat-output to write all outputs directly into the output directory.

The legacy files are now compatibility wrappers:

python gf3_L1A_To_L2.py run --input D:\GF3\L1A_BATCH --output E:\GF3\L2_Image --dem .\GMTED2010.jp2
python Decompression.py D:\GF3\L1A_BATCH

Notes

• The CLI extracts .tar.gz and .zip products before processing unless --skip-decompress is used.
• Existing L2 outputs are skipped unless --overwrite is used.
• Logs are written to <output>\logs.
• Without representative GF3 products, verification is limited to parser unit tests and Python syntax/import checks.