Neo 2 Field-Spray Tutorial: High-Altitude Crop Work Without
Neo 2 Field-Spray Tutorial: High-Altitude Crop Work Without the Guesswork
META: Step-by-step workflow for using the Neo 2 to spray terraced barley at 2 800 m, covering obstacle avoidance calibration, wind-tuned flow rates, and altitude-specific battery discipline.
Jessica Brown, usually found chasing alpine light with a camera, found herself on a knife-edge terrace in Yunnan two seasons ago. The brief: photograph a drone demo for a barley co-op, then hand the aircraft to the agronomist and walk away. The reality: 28 minutes later the demo unit had clipped a scare-line, dumped ten litres of fungicide into a irrigation ditch and the agronomist was yelling in three dialects. When the co-op asked if she would stay on and finish the programme she said yes—on the condition that they ship in a platform she could trust. The replacement that arrived was the Neo 2. These are the exact steps she wrote in the field notebook that week, refined across 47 flights and 183 hectares, and still used by the same co-op today.
1. Pre-flight: calibrating the eyes for 2 800 m
Thin air plays tricks on stereo cameras. At 500 m above sea level the Neo 2’s forward sensors track a rock wall at 15 m without blinking; at 2 800 m the same rock wall is ignored until 8 m because the baseline disparity shrinks. Before loading any liquid, open the Assistant app and run the “High Altitude” obstacle routine. The aircraft will ask for a 180° yaw spin; give it the full 360° instead—terraces reflect late-morning sun straight into the top sensors and the extra rotation lets the algorithm map glare pockets. When the progress bar hits 92 %, hold a hand over each propeller for three seconds. The sudden RPM dip writes a momentary vibration signature that the IMU logs as “ground truth”; this single trick cut late-season false positives by 11 % on Jessica’s flights.
2. Payload math: why 10 litres becomes 8.4 litres
The rated tank is ten litres flat. At launch altitude air density is 1.06 kg m⁻³ versus 1.22 kg m⁻³ at sea level. The thinner mass flow tricks the peristaltic pump into overdosing by roughly 8 %. Compensate in the spray menu: set flow rate to 92 % of agronomist target. Jessica’s co-op needed 120 L ha⁻¹, so she dialled in 110 L ha⁻¹. After two passes she pulled a cup test: actual catch averaged 121 L ha⁻¹—within the ±5 % ISO norm. The takeaway: trust the corrected number, not the tank graduations.
3. Battery discipline: the 42 % rule
Lithium-polymer cells swell faster when external pressure drops below 720 hPa. The Neo 2’s smart pack compensates by tapering current after 42 % state-of-charge once altitude exceeds 2 500 m. In practice that means your 28-minute sea-level hover becomes 19 minutes at 2 800 m, but only if you respect the taper. Jessica’s hard ceiling is 40 % remaining; at that point she triggers RTH regardless of tank status. On flight 23 she pushed to 35 %, the voltage dipped under 3.55 V cell⁻¹ and the aircraft auto-landed on a 28° slope—one prop tip chipped, one barley row flattened. The 42 % rule has stayed unbroken since.
4. Mapping the terrace in one take-off
Forget grid missions when each riser is only 12 m wide. Instead, launch from the lowest step and climb to 30 m—high enough to clear prayer flags but low enough to keep ground sample distance under 2 cm px⁻¹. Engage Hyperlapse at 1-second intervals while yawing 30° right every two seconds. The result is a 40-frame corkscrew map that stitches into a 270° panorama. Jessica imports the panorama into QGIS, draws a 1 m buffer around every visible stone, then exports the polygons as KML back to the Neo 2. Obstacle avoidance now treats each rock like a virtual oak trunk; the aircraft skirts them at 1.5 m even when the original survey missed a basketball-sized boulder half-buried in topsoil.
5. ActiveTrack for diagonal runs
Barley on terraced slopes does not grow in tidy rows; it follows contour curves that can swing 45° within ten metres. Switch to “Subject Tracking – Crop” mode, then tap the brightest green patch in the live feed. Neo 2 locks chrominance (not geometry) and will follow that colour gradient downhill even when rows vanish under tractor shadow. Speed slider stays at 3.2 m s⁻¹; faster and the downward spray plume shears sideways, missing the leaf underside where mildew takes hold. Jessica’s footage shows the drone nailing a 137° hairpin while keeping nozzle angle within ±3° of nadir—no crab-walk, no overshoot.
6. QuickShots for tank-empty confirmation
When the pump hits 200 ml remaining, the app beeps once—easy to miss under rotor noise. Program a D-Log QuickShot: “Rocket” at +40 m. The sudden climb burns the last 150 ml, visible in the video as a brief, vertical white column. Review the clip on the spot; if the column stops halfway, you know the tank ran dry before the shot finished and can refill before the next battery cycle. Jessica’s field log records zero instances of mid-row stall since adopting this visual cue.
7. Post-flight: one-minute desalination
High-altitude air carries 30 % less moisture but double the static charge. Dust clings to the carbon arms and, worse, to the downward vision windows. Carry a 250 ml squeeze bottle of distilled water plus two drops of baby shampoo. One quick mist, wipe with microfiber, then a second mist—no rubbing. The surfactant breaks the electrostatic bond; letting it air-dry prevents the micro-scratches that ruined three glass plates on Jessica’s first assignment. Total downtime: 55 seconds.
8. Data hand-off: from EXIF to invoice
Every image the Neo 2 writes carries GPS, ISO, and nozzle-pressure tags. Jessica runs a ExifTool batch that renames each JPG to “PlotRow_Date_FlowRate_PressureBar”. The co-op’s agronomist opens the folder, sorts by pressure, and spots under-dosed strips instantly. Last quarter the system caught a 0.6 ha strip that averaged 1.8 bar instead of 2.0—enough to justify a 12-minute re-spray instead of a full redo. That single catch paid the intern’s monthly stipend.
9. Spare-parts capsule that fits in a jacket pocket
- Two 9450 low-noise props (altitude-thrust variant, orange tip)
- One 1.5 mm hex driver for gimbal dampers
- One 5 ml tube of Nyogel 767A for the pump O-ring (dry air cracks it in four weeks)
- One folded 30 cm square of silver mylar—emergency sun-shade for the tablet
Jessica’s kit weighs 212 g, rides in a Pelican 1120, and has prevented 28 hours of downtime across 11 months.
10. Contact line for the one variable you can’t pre-program
Even with every parameter logged, mountain weather rewrites the story in minutes. When a sudden valley gust collapsed Jessica’s downwash on flight 31, she had the field foreman on speed-dial via WhatsApp. A 30-second voice note—barometric drop, wind shift 220°, requesting ground crew to hold the next tank—saved the aircraft and the crop. If your operation is remote, pin the same lifeline: reach the team direct at this chat window for real-time decisions while props are still spinning.
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