Glossary of Common Terms for Agricultural Drone Pilots

Technology, like farming, uses many unique terms or phrases. This can cause confusion to new users. I am providing this list of common terms used by Ag Drone Pilots to help avoid that confusion. Let me know if there is a word or phrase that should be added!

• AAOC (Agricultural Aircraft Operator Certificate) – The FAA-issued certificate required before conducting commercial agricultural spray operations; must be obtained in conjunction with either a Part 107 exemption or a Section 44807 exemption.
• ADS‑B – Automatic Dependent Surveillance–Broadcast system that transmits an aircraft’s position and identification to improve traffic awareness and airspace integration.
• Ag drone – Drone configured specifically for farming tasks such as spraying, mapping, seeding, or scouting; built for agricultural payloads and rugged field workflows.
• AGL (Above Ground Level) – Altitude measured relative to the ground directly beneath the aircraft rather than sea level.
• Agras series – DJI’s family of agricultural platforms (e.g., T100, T70P, T25P, T50) designed for precision spraying, seeding, and SmartFarm integration.
• Agrifuture – Vendor term for operational services that scale ag‑drone fleets, including service networks, operator training, and fleet integration.
• Agronomy – The science of soil management and crop production; the foundational knowledge base that informs where and how drone applications are most effective.
• AgroSol – Hylio’s ground control and fleet management software for mission planning, logging, and coordinated operations.
• Altitude hold – Flight mode that automatically maintains a set altitude using sensor feedback.
• Altimeter – Instrument that reports altitude using barometric pressure or GNSS data.
• American Security Drone Act (ASDA) – Legislation embedded in the FY2024 NDAA that extended drone security restrictions government-wide, prohibiting federal agencies from procuring or operating drones from covered foreign entities, and barring use of federal funds by contractors and grantees to acquire them as of December 22, 2025.
• Application rate – The volume of liquid or granular material applied per unit area (e.g., ounces per acre); a critical parameter set in mission planning to ensure correct dosing.
• Autonomy – Capability of a drone to perform missions with minimal or no human intervention, including navigation and decision making.
• Autopilot – Onboard hardware and firmware that controls attitude, navigation, and mission execution.
• Battery management – Systems and software that monitor, protect, and optimize battery health, state of charge, and power delivery. See my article.
• Blade connector (battery) – Rugged quick‑swap battery connector style used on large ag drones for fast battery changes and secure power transfer.
• Blue UAS List – A curated list of drone platforms vetted and approved by the U.S. Department of Defense’s Defense Innovation Unit (DIU) — now managed by the Defense Contract Management Agency (DCMA) — that meet rigorous standards for cybersecurity, supply-chain integrity, and operational performance. Drones on this list are cleared for use by federal agencies without additional security review. As of late 2025, the list includes over 39 approved platforms.
• Boom controllers – Devices that regulate pressure and flow across sprayer booms to ensure uniform application.
• BVLOS (Beyond Visual Line of Sight) – Operations where the drone flies outside the pilot’s unaided visual range, often requiring extra safety systems and approvals. The FAA released proposed BVLOS regulations in early 2026, which would create a formal pathway for routine BVLOS operations without individual waivers.
• B4UFLY – The FAA’s free mobile app that helps drone pilots quickly check whether an area is safe and legal to fly in, based on current airspace restrictions, NOTAMs, and TFRs.
• Canopy penetration – The ability of spray droplets to reach beneath the top layer of foliage and coat lower leaves and stems; influenced by droplet size, nozzle type, and flight speed.
• CCMS nozzle – Vendor nozzle design engineered for fine, uniform atomization with adjustable droplet sizes to improve canopy penetration.
• CFR (Code of Federal Regulations) – The body of federal rules governing U.S. drone operations, particularly Title 14 (FAA regulations); Part 107 and Part 137 are the most relevant sections for agricultural drone pilots.
• Charged nozzles – Nozzles that impart an electrostatic charge to droplets to improve deposition and reduce drift.
• Clustering algorithms – Statistical or machine‑learning methods that group similar field areas into management zones.
• COA (Certificate of Waiver or Authorization) – FAA-issued operational approval for flying in specific airspace, required in conjunction with a Section 44807 exemption. Operators with a 44807 exemption automatically receive a blanket COA for flights at or below 400 feet in Class G airspace.
• Coaxial dual rotors – Rotor configuration with stacked contra‑rotating rotors on the same axis to increase lift in a compact footprint.
• Colorimetric index – A vegetation index derived from visible-light (RGB) imagery rather than multispectral data; useful for scouting when a full multispectral sensor isn’t available.
• Correction networks – Services (e.g., NTRIP/RTK networks) that provide GNSS correction data to improve positioning accuracy in real time.
• Cover crop – A crop planted primarily to protect and enrich soil between main growing seasons; increasingly seeded via drone for speed and access in wet or muddy conditions.
• Covered List (FCC) – The FCC’s list of equipment and services deemed to pose unacceptable national security risks. As of December 22, 2025, all UAS and critical UAS components produced in foreign countries were added to this list, effectively blocking new FCC equipment authorizations for foreign-made drones. Drones on the Blue UAS List are exempt.
• Crop mapping – Producing georeferenced orthomosaics and elevation models from aerial imagery to visualize field variability.
• Crop scouting – Aerial inspection of fields to detect pests, disease, nutrient stress, or irrigation issues; enables targeted interventions. See my article.
• CTB shell (battery) – Vendor term for a rugged, modular battery housing designed for high ambient temperatures and fast charging.
• DaaS (Drone‑as‑a‑service) – Commercial model where operators provide drone flights, data collection, and analysis to farmers on contract or subscription.
• Data logger – Onboard or ground-based device that records flight parameters, GPS tracks, and application data for compliance, billing, or agronomic analysis.
• Dead reckoning – Navigation method that estimates current position based on a known starting point, speed, heading, and elapsed time; used as a fallback when GNSS signal is weak.
• Drone mission planners – Software tools used to design flight paths, set waypoints, configure sensors, and schedule automated missions.
• DIU (Defense Innovation Unit) – The U.S. Department of Defense agency that originally created and managed the Blue UAS List; management of the list transitioned to DCMA in late 2025.
• Drone swarming – Coordinated operation of multiple drones working together to cover large areas or perform synchronized tasks.
• Droplet size – The diameter of individual spray droplets, typically classified from very fine to ultra-coarse; smaller droplets provide better coverage but are more prone to drift.
• Duty cycle – The ratio of operational (flying) time to total time including charging, refilling, and maintenance; a key metric for planning daily field productivity.
• Electrostatic spraying – Spraying technique that charges droplets to improve canopy coverage and reduce off‑target drift.
• ESCs / Motor controllers – Electronic Speed Controllers and motor control hardware that regulate motor RPM per flight controller commands.
• FAA Part 107 – The primary FAA regulation governing commercial small UAS operations in the U.S. for drones weighing under 55 pounds at takeoff. Covers pilot certification, operational limits, and waivers. Agricultural spray operators under 55 lbs must also obtain an exemption from Section 107.36 (carriage of hazardous material) and comply with Part 137.
• FAA Part 137 – The FAA regulation governing agricultural aircraft operations, including spraying, spreading, and seeding. Drone operators conducting aerial application must hold an Agricultural Aircraft Operator Certificate (AAOC) under Part 137 regardless of whether they operate under Part 107 or Section 44807. A streamlined certification process now allows applicants to submit FAA Form 8710-3 directly to UAS137Certificates@faa.gov.
• FAA Reauthorization Act – Periodic legislation that funds the FAA and introduces significant regulatory changes. The 2012 act introduced Section 333 exemptions; the 2018 act overhauled recreational drone rules; the 2024 act included updates to the 44807 authorization process and waiver evaluation criteria.
• FCC Covered List – See “Covered List (FCC)” above.
• Field boundary – The GPS-defined perimeter of an agricultural field used by mission planning software to constrain flight paths and calculate coverage areas.
• Firmware – Embedded software stored on drone hardware components (flight controller, ESCs, sensors) that controls their operation; kept updated for performance and safety fixes.
• FlyCart / DeliveryHub – Product family names for ground logistics and delivery integration paired with aerial platforms.
• Flow meters – Devices that measure liquid flow rate in spray systems to ensure correct application volumes.
• Flight controller – Central onboard computer that reads sensors, runs stabilization and navigation algorithms, and issues motor commands.
• Fungicide – A chemical compound applied to crops to prevent or treat fungal disease; one of the most common spray payloads for agricultural drones.
• GCPs (Ground Control Points) – Precisely surveyed markers used to georeference aerial imagery and improve absolute map accuracy.
• GCS (Ground Control Station) – Hardware and software interface used by pilots to plan missions, monitor telemetry, and control drones.
• Geofencing – Virtual geographic boundaries programmed into a drone or GCS to prevent entry into restricted areas.
• GIS (Geographic Information System) – Software for capturing, storing, analyzing, and visualizing spatial farm data.
• GNSS (Global Navigation Satellite System) – Satellite constellations (GPS, GLONASS, Galileo, BeiDou) that provide positioning and timing.
• GPS (Global Positioning System) – The U.S.-operated satellite navigation system; one component of the broader GNSS constellation used for drone positioning.
• Green UAS – A certification program run by AUVSI that vets commercial and public-sector drones for cybersecurity and NDAA compliance. Less stringent than Blue UAS but sufficient for most non-defense government and commercial applications. As of 2025, Green UAS certification can serve as a pathway to full Blue UAS clearance.
• GroundLink – Integrated ground station hardware that pairs with fleet software for mission control and multi‑drone management.
• Ground receivers – Hardware that receives telemetry, video, and positioning data from the UAV for monitoring and logging.
• GroundStation Launch Kit – Packaged set of ground equipment (tablet, RC, chargers, spare batteries, trailer gear) for field operations.
• Ground speed – The actual speed of the drone relative to the ground; directly affects application rate and swath consistency.
• Gyros / Accelerometers (IMU components) – Individual sensors inside the IMU that measure rotational rates and linear acceleration for attitude estimation.
• Herbicide – A chemical compound used to control or kill unwanted vegetation (weeds); applied via drone for targeted or broadcast treatment.
• Hover – Ability of a multirotor drone to maintain a fixed position and altitude in the air.
• IMU (Inertial Measurement Unit) – Sensor package containing gyroscopes and accelerometers used for motion and rotation measurement.
• Insecticide – A chemical compound applied to crops to control insect pests; a common drone spray application particularly for corn rootworm or aphid management.
• Intelligent Flight Batteries – Vendor term for batteries with integrated management features (fast‑charge, thermal management, modular repairability).
• Intelligent LiPo / 18S battery – High‑voltage LiPo packs with integrated thermal management and fast‑charge profiles for high‑tempo sorties.
• Label (pesticide) – The legally binding document attached to a pesticide product specifying approved uses, application rates, safety requirements, and equipment guidelines. In the U.S., the label is the law — operators must follow it regardless of what other regulations permit.
• Leaf area index (LAI) – A measure of the total one-sided area of leaf tissue per unit ground surface area; used to assess crop canopy density and guide application decisions.
• LiDAR – Light Detection and Ranging sensor that emits laser pulses and measures return times to create precise 3D point clouds of terrain, canopy structure, and obstacles.
• LiDAR + millimeter‑wave radar – Combined sensing suite that uses LiDAR and mm‑wave radar to maintain terrain following and detect obstacles even in spray or fog.
• Lidar‑enabled terrain following – Capability where LiDAR actively senses terrain and adjusts flight altitude to keep nozzle/boom height consistent.
• MAP61 / RGB61 – Payload model names for multispectral (MAP61) and high‑resolution RGB (RGB61) sensors used on mapping platforms.
• Mesh communications – Network topology that allows drones and ground nodes to relay data among multiple devices for robust connectivity.
• Multispectral imaging – Cameras that capture discrete spectral bands beyond visible light to reveal plant physiology and stress. See my article.
• Mission radius – The maximum distance from the launch point a drone can fly while still completing its mission and returning safely with adequate battery reserve.
• MTOW (Maximum Takeoff Weight) – The maximum allowable combined weight of the drone, payload, and fuel/batteries at launch. A critical number in FAA exemption applications — operations at or above 55 lbs trigger Section 44807 requirements rather than Part 107.
• NDAA (National Defense Authorization Act) – Annual legislation that funds U.S. defense and has increasingly included restrictions on drone procurement. Key provisions for drone operators: the FY2020 NDAA barred DoD from using Chinese-made drones; the FY2024 NDAA (via the American Security Drone Act) extended these restrictions government-wide; the FY2025 NDAA added further language targeting specific foreign drone manufacturers. For agricultural operators, NDAA compliance is most relevant when seeking government contracts or federal grant funding.
• NDAA-compliant – A designation indicating a drone does not use components or manufacturers from covered foreign countries (primarily China, Russia, Iran, and North Korea). Unlike Blue or Green UAS designations, NDAA compliance is often self-declared and not independently verified — buyers should request documentation.
• NIR (Near-Infrared) – A portion of the electromagnetic spectrum just beyond visible red light; plants reflect NIR strongly when healthy, making it a key band in vegetation indices like NDVI.
• NDVI (Normalized Difference Vegetation Index) – Vegetation index computed from NIR and red reflectance to indicate plant vigor and biomass. See my article.
• No‑fly zone databases – Curated datasets of restricted airspace and temporary flight restrictions used to warn or block flights.
• No-spray buffer – A designated distance from field edges, waterways, or sensitive areas where application must be stopped to prevent off-target contamination.
• NOTAM (Notice to Airmen) – An official notice issued by the FAA alerting pilots to temporary changes in airspace, hazards, or restrictions. Operators with a Section 44807 COA are typically required to request a NOTAM no more than 72 hours before — and no less than 24 hours prior to — each operation.
• Nozzle – Component at the end of a spray line that shapes droplets and controls spray pattern for accurate application.
• Obstacle avoidance – Systems combining sensors and algorithms that detect obstacles and automatically alter flight to prevent collisions.
• Onboard AI – Embedded algorithms and processors that interpret sensor data in real time to enable autonomy tasks such as obstacle avoidance and target detection.
• Orthomosaic software – Tools that stitch overlapping images into a single, georeferenced, scale‑accurate map.
• OSD (On‑Screen Display) – Overlay that shows telemetry (altitude, speed, battery, GPS) on video feeds for situational awareness.
• Payload – Equipment carried by the drone (sprayer, camera, LiDAR, sensors); payload capacity affects endurance and performance.
• Pesticide applicator license – A state-issued certification required in most U.S. states to legally apply restricted-use pesticides. Drone operators applying chemicals often need this in addition to FAA Part 107 certification and Part 137 AAOC.
• Photosynthesis – The biological process by which plants convert sunlight, water, and CO₂ into energy; multispectral drone imaging can reveal when this process is stressed before visual symptoms appear.
• Photogrammetry – Science and techniques of making measurements and maps from overlapping photographs to reconstruct 2D and 3D models.
• Point‑cloud processors – Software that cleans, classifies, and converts LiDAR or photogrammetric point clouds into usable models and metrics.
• PPK (Post‑Processed Kinematic) – GNSS correction method applied after flight to improve positional accuracy of imagery and survey data.
• Precision agriculture – Farming approach that uses spatial and temporal data to optimize inputs and improve yields while reducing waste.
• Prescription maps – Spatial files that specify variable application rates or treatment zones across a field. See my article.
• Pumps / Smart Liquid Tank – Tank and pump systems with integrated sensors and flow control to manage liquid application and refills.
• Rapid charge infrastructure – High‑power charging systems and generator requirements vendors specify to sustain continuous operations.
• Radar – Radio Detection and Ranging system that uses radio waves to detect objects, measure distance and relative speed, and penetrate dust, fog, or spray plumes for robust obstacle detection.
• Relay / Relay station – Ground communications node that extends telemetry and control range by relaying signals between drone and GCS.
• Relative speed of obstacle avoidance – Vendor spec describing the maximum closure speed at which obstacle‑avoidance sensors can reliably react.
• Remote ID – FAA-mandated system requiring drones to broadcast identification and location information in real time, similar to a digital license plate. Required for most commercial UAS operations. Notably, drones operating under a Section 44807 exemption have specific Remote ID conditions outlined in their exemption documents.
• RGB imaging – Standard color photography using red, green, and blue channels; useful for visual scouting and basic canopy assessment without the complexity of multispectral sensors.
• RTK (Real‑Time Kinematic) – GNSS correction technique that provides centimeter‑level positioning in real time using a base station or network.
• RTK base stations – Local GNSS reference units that broadcast correction data to nearby rovers for RTK positioning.
• RTH (Return‑to‑home) – Automated safety function that commands the drone to return to launch or a predefined safe location.
• Rotary atomizer – High‑throughput atomizer used on large spray drones to produce controlled droplet spectra for canopy penetration.
• Rotorcraft – Aircraft that generate lift through rotating blades (rotors), including multirotors used for vertical takeoff and hovering.
• Section 333 exemption – The predecessor to Section 44807, introduced by the FAA Reauthorization Act of 2012, which allowed the FAA to grant commercial drone exemptions before Part 107 existed. Largely superseded but sometimes referenced in older exemption documents.
• Section 44807 exemption – The primary FAA authority (49 U.S.C. §44807) for operating drones weighing 55 pounds or more in the national airspace. Uses a risk-based approach to grant exemptions on a case-by-case basis in lieu of a standard airworthiness certificate. Agricultural operators of heavy spray drones must obtain this exemption, an AAOC under Part 137, and a COA. Applications must be submitted at least 120 days before the intended operation date. Approved drone models are listed on the FAA’s List of Approved UAS (Agricultural) under docket FAA-2023-1271.
• Seeding / Spreading systems (integrated) – Modular systems that allow rapid role changes between spraying, seeding, and granular spreading on the same airframe.
• Service infrastructure (fleet ops) – Local service networks, operator training, spare parts, and uptime standards vendors provide to support production operations.
• Sensor fusion – Process of combining data from multiple sensors (IMU, GNSS, camera, LiDAR) to produce a reliable estimate of state and environment.
• Sensor fusion algorithms (Kalman filters) – Mathematical methods used to combine noisy sensor inputs into stable estimates of position, velocity, and attitude.
• SLAM (Simultaneous Localization and Mapping) – Technique using onboard sensors to build a map and localize the vehicle in GPS‑challenged areas.
• SmartFarm (app / web) – Integrated farm management platform for scheduling missions, managing fleets, and aggregating application and mapping data.
• Smart Liquid Tank – Branded tank system with integrated level sensors, flow control, and telemetry for application management.
• Spreader tank with material sensor – Spreading module that monitors material level and agitates granular product to ensure uniform flow.
• Sprayer boom – Structural arm that carries multiple nozzles to distribute spray evenly across a swath.
• Spray drift – Unintended movement of spray droplets away from the target area due to wind, evaporation, or droplet size.
• Stereo vision – Depth‑sensing technique using two or more cameras spaced apart to compute disparity and generate real‑time depth maps for obstacle detection and terrain profiling.
• Swarm‑enabled operations – Capability to coordinate multiple drones from a single ground station for parallelized coverage.
• Swath width – The width of the area covered by a drone’s spray boom or sensor in a single pass; determines line spacing in mission planning and directly affects efficiency.
• Tank mix – A combination of two or more agricultural chemicals (e.g., herbicide + adjuvant) blended in the spray tank before application; requires compatibility checks to avoid chemical reactions.
• TFR (Temporary Flight Restriction) – An FAA-issued airspace restriction of limited duration around specific geographic areas (e.g., wildfires, stadiums, VIP movements). Drone operators must check for active TFRs before every flight.
• Thermal imaging – Use of infrared cameras to detect heat signatures in crops; can reveal irrigation stress, drainage patterns, and pest or disease hotspots not visible in standard photography.
• Telemetry – Real‑time transmission of flight, sensor, and payload data from the drone to the ground control station.
• Telemetry radios / LTE/5G links – Short‑range radios (900 MHz / 2.4 GHz) for local command and cellular options (LTE/5G) for long‑range telemetry.
• Terrain following (LiDAR + autonomy) – Automated altitude control using LiDAR and autonomy to maintain consistent application height over uneven ground.
• Ultra‑high coverage metrics (acres/day) – Manufacturer performance claims for operational throughput that vary by model, payload, and conditions.
• UAS (Unmanned Aircraft System) – Complete system including UAV, ground control, data links, batteries, and support equipment.
• UAV (Unmanned Aerial Vehicle) – The aircraft component of a UAS that carries payloads and performs flight operations.
• UTM (UAS Traffic Management) – The FAA’s developing framework for managing drone traffic at low altitudes, analogous to air traffic control for manned aircraft. The 2024 FAA Reauthorization Act directed the FAA to publish a UTM concept of operations within one year.
• Volunteer plant – A crop plant growing where it was not intentionally planted, often from seed left from a prior season; identifiable during drone scouting as an indicator of field management issues.
• VRA (Variable Rate Application) – Technique and systems that vary input rates across a field based on spatial prescriptions.
• VRA controllers – Hardware that modulates application rates in real time according to prescription maps and flow feedback.
• VLOS (Visual Line of Sight) – Operation where the pilot maintains unaided visual contact with the drone at all times.
• Waypoint – Programmed GPS coordinate or navigation point the drone follows during an automated mission.
• Wind speed limit – The maximum allowable wind speed for safe and effective drone spraying; most ag drones have manufacturer-specified limits, and exceeding them increases drift risk significantly.
• Yield mapping – Spatial recording of harvest data (yield, moisture) across a field to analyze productivity patterns.
• Zero‑turn logistics – Operational concept describing tightly choreographed ground workflows (battery swap, refill, rearm) that minimize drone downtime.
• Zoning – Dividing a field into management zones based on imagery, soil, or yield data so inputs can be targeted where most needed.