Landsat 8/9 and Sentinel-2 imagery, supervised classification, 30m resolution, 90%+ accuracy for major crops.
Corn-soybean (healthy), continuous corn (yield penalty), corn-soy-wheat (excellent), fallow (investigation needed).
Shannon/Simpson metrics quantify rotation quality and management stewardship.
Sub-field management invisible, cover crops underreported, mixed pixel effects near field edges.