Crop stress detection with drones: a step-by-step workflow.

1. Capture

• Fly in consistent light, ideally mid-morning to early afternoon
• Keep altitude and camera settings the same between flights
• Nadir frames, with enough overlap if you plan to stitch

2. Analyse

Send frames to Nabhya to get a vigour map, percentile management zones, canopy cover and a mask of non-crop pixels.

3. Review zones

• Start with the weakest zone and its largest contiguous patch
• Check whether the pattern follows irrigation, slope or field edges

4. Ground-truth and act

Walk the flagged zones, identify the cause — water, nutrient, pest or disease — and act. Re-fly after the intervention to confirm the zone has recovered.