The amber blob, worked end to end
The demo's physics-grounded synthetic scene. Every image below is a screenshot of the running app.
One color for three different problems
The NDVI tab shows the field the way a satellite monitoring service delivers it: one amber region in the northeast quarter, labeled stressed, with no cause and no prescription. This is the starting point every precision-ag team already has, and the point where the decision stalls.
The blob resolves into typed zones
Running Diagnose field splits that single amber region into distinct causes: nitrogen deficiency in amber, water stress in blue, and early tar spot in red, with hatched pixels abstained and routed to ground-truth scouting. On this held-out physics-grounded synthetic scene, the verdict panel reports macro-F1 0.89 for SpectraRx against 0.69 for the Sentinel-2 incumbent, calibrated accuracy 0.89, and 20.1 percent of the field abstained. One map becomes three different jobs.
The model reads the physics, not the data
The obvious objection to any crop classifier is that it learned the shape of its own training data. The spectral inspector answers part of that question directly. For tar spot, the independently computed band-saliency trace peaks in the sampled 530 and 535 nm bins nearest the PRI diagnostic near 531 nm. For nitrogen it weights the 680 to 720 nm red-edge. The system separately checks documented 970, 1450, and 1940 nm SWIR water diagnostics; those checks are not presented as the CNN's highest saliency peaks.
Calibration is load-bearing, and the model admits it
Toggling Skip atmospheric correction feeds the classifier raw top-of-atmosphere radiance. Accuracy collapses from 0.887 to 0.373; 92.2 percent of pixels abstain and 140 of 144 management zones route to ground-truth scouting. Four water-stress zones still apply under the zone rule, so this is an inspectable safeguard rather than a universal block.
A prescription a boom can execute, and a record template for review
The diagnosis becomes 144 management cells at a 27 m boom profile and 25 m resolution: 21 zones to apply, 25 to scout, and 98 already healthy. Each apply zone carries a product and rate under the demo's deterministic prescription rules. It exports as ISO-XML and GeoJSON, and as the EU Farm-to-Fork IPM-style record, which lists per-zone geo-coordinates, spectral evidence, alternatives evaluated, the R3 deadline, and a certified-agronomist sign-off line.
Where the broadband incumbent is structurally blind
On the 1,280-pixel held-out, physics-grounded synthetic cultivar-and-soil test, SpectraRx scores macro-F1 0.887 against 0.69 for the Sentinel-2 incumbent and 0.856 for a narrowband physics-feature model. Per class, the incumbent is a genuinely strong baseline on nitrogen, near 1.0. It falls behind on water, 0.63 against 0.97, and on early tar spot, 0.61 against 0.77. This is a mechanism result, not a field guarantee.
