• Best if overhead, bright, and uniform.
• If there is cloud cover, it must be consistent and provide uniform light filtration.
• Surveys done early in the morning or late in the day may not work. The low sun angle will cast shadows from trees or relatively higher crop areas. This can invalidate NIR reflectance as a measure of crop health.
Ground Speed: 8 m/s
Pattern: Lawnmower pattern/Survey Grid.
Camera ISO: 400
Photo Interval (if not controlled by autopilot): 2 seconds
Photo Sidelap: 10%
Photo Overlap: 10%
Survey Grid Area: 10 meters in from the edge of the field. DO NOT include the perimeter of the field in the survey. Only survey the planted area of the field. The inclusion of the perimeter and area beyond may invalidate survey results.
Survey Grid Angle:
If flying with a gimbal:
• If light or no wind, fly perpendicular to the direction of rows (optimize count accuracy).
• If strong wind, fly perpendicular to wind direction (optimize flight efficiency).
If flying with NO gimbal:
• If no wind, fly perpendicular to the direction of rows (optimize count accuracy).
• If any wind, fly perpendicular to wind direction (maintain consistent camera angle and optimize flight efficiency).