Pipeline Stages

1. Download *_directional_reflectance.h5
2. Export to ENVI → *_envi.img/.hdr
3. Topographic + BRDF correction → *_brdfandtopo_corrected_envi.img/.hdr (+ JSON)
4. Cross-sensor convolution (TM, ETM+, OLI/OLI-2, MicaSense variants)
5. Parquet export for all ENVI products
6. DuckDB Merge (new) → <prefix>_merged_pixel_extraction.parquet
7. QA Panel (restored) → <prefix>_qa.png (triggered post-merge)