Remove inline ArcPy compression and add GDAL backfill tool

[erin-glen]

Summary

• remove the inline LZW compression context from ArcPy raster export helpers
• update documentation to reflect uncompressed outputs
• add a GDAL-based utility for retroactive compression of existing disturbance rasters

Testing

• python -m py_compile gdal_compress_outputs.py

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https://chatgpt.com/codex/tasks/task_e_68fd10b0ab3c8320bfb3571a75ad8a88

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Preserve permissions when overwriting rasters

When compressing with --overwrite, the raster is rewritten via NamedTemporaryFile and os.replace. Temporary files are created with mode 0o600, and os.replace brings those restrictive permissions along. Any raster that originally had broader read permissions (e.g., shared data at 0644) will become owner‑only after compression, breaking downstream access for other users or services. Consider copying the original file’s mode to the temporary output before replacing, or using shutil.copymode so that compression doesn’t silently revoke access.

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