Thumbnail Interpretation

Each deforestation thumbnail consists of three vertically stacked panels:

1. Top — Before: Satellite imagery from the start of the monitoring period (typically the EUDR cut-off date, December 31, 2020)
2. Middle — After: Satellite imagery from the end of the monitoring period. Taken from the same time of year as the "before" image for seasonal comparability.
3. Bottom — Overlay: Color-coded analytical overlay combining deforestation alerts, commodity presence, and natural forest baseline.

The overlay panel encodes three independent data layers as RGB color channels. Where layers overlap, colors blend additively.

Primary channels:

Channel	Layer	Data Sources
Red	Change detection	Union of CCDC (Dynamic World), GFW-GLAD, and JRC-TMF deforestation signals
Green	Natural forest baseline	Nature Trace Forest Typology 2020 (FORTY) — Primary Forest + Naturally Regenerating Forest classes, FDP Forest Persistence
Blue	Commodity layer	FDP commodity probability models for the target crop

Color combinations and their meaning:

Color	Channels	Meaning	EUDR Relevance
Red only	Red	Change detected outside natural forest and commodity areas	Low — may be agricultural rotation or non-forest clearing
Green only	Green	Stable natural forest, no change, no commodity	None — healthy forest
Blue only	Blue	Stable commodity area, no change, no natural forest	None — existing plantation
Yellow	Red + Green	Deforestation detected in natural forest	High — primary EUDR signal
Magenta	Red + Blue	Forest loss in a commodity area	Medium — may indicate replanting cycles or on-farm management
Cyan	Blue + Green	Commodity in former natural forest (no active change)	Medium — historical conversion, flagged for due diligence
White	Red + Blue + Green	Change + commodity + natural forest all overlap	Critical — active conversion of natural forest to commodity

Yellow patches within the plot boundary indicate deforestation in natural forest. Magenta patches indicate forest loss in areas where the commodity is detected. Both require investigation — yellow is the higher EUDR priority.

Supply shed thumbnails cover a wider area (the travel-time isochrone around a facility) and show aggregated deforestation patterns across all probabilistic commodity plots.

Clean plot — Overlay shows predominantly green (stable forest) or no color (non-forest land). No red, yellow, or white. Before/after panels show consistent land cover.

Border detections — Thin strips of yellow/red along plot edges. Usually caused by GPS inaccuracy or digitization error. Check before/after panels: if vegetation is consistent across the boundary, the detection is likely an artifact.

Internal deforestation — Solid patches of yellow or white within the plot interior. Before panel shows canopy; after panel shows cleared land. This is a genuine detection.

Cyan (commodity in natural forest) — Historical conversion that predates the monitoring window. No active change (no red), but flagged for due diligence.

• Always compare the overlay with the before/after panels — the overlay is algorithmic, the imagery is ground truth.
• For plots with confidence medium or lower, manual thumbnail inspection is strongly recommended.
• Yellow and white pixels are the most EUDR-relevant — focus review time there.
• Border artifacts are common with approximate geometries. If detections are confined to edges, improve the boundary data.

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