Key Checkpoints: Prior to every flight mission, a comprehensive inspection must be performed on the UAV platform (motors, propellers, batteries, GPS modules), the hyperspectral imager (lens cleanliness, storage media, data interfaces), and the shock-absorbing gimbal. Ensure that all fiber optic and data cables are securely connected without any loosening or wear. System Self-Check: After powering on, execute a ground warm-up (≥15 minutes). Once the detector temperature of the imager stabilizes, run the system self-check program: verify IMU-to-gimbal communication, trigger signal synchronization, dark current acquisition, and white panel calibration. Check the remaining storage capacity to ensure it is sufficient to cover the entire flight route. Environmental Assessment: Record site meteorological conditions (wind speed, temperature, humidity, visibility), ensuring that wind speed is <5m/s and there is no precipitation or heavy haze. Use a portable spectral irradiance meter to measure ambient light intensity; if light intensity fluctuations are excessive (±5%), it is recommended to postpone the mission.

Flight Path Design: Arrange the flight paths along the direction of the "solar principal plane" (flight lines perpendicular to the solar incident direction) to minimize solar glint interference. Maintain a forward overlap rate of ≥70% and a side overlap rate of ≥40%. The flight altitude is determined based on ground resolution requirements (typically 50-120m) to ensure that the hyperspectral image GSD fulfills application criteria. Parameter Setup: Configure a constant ground speed (3-5m/s recommended) to prevent imaging distortions caused by rapid acceleration or deceleration. Preset the integration time according to the ambient light intensity (typically 500-2000μs) to ensure that the signal intensity reaches 70%-90% of the full scale. Match the frame rate with the ground speed to avoid pixel smearing or under-sampling. Ground Control: Deploy ground reflectance calibration targets (black, grey, and white panels) along with Ground Control Points (GCPs) at the four corners and center of the survey region for subsequent radiometric calibration and geometric correction. Record the position coordinates and calibrated reflectance values for each target.

Calibration Workflow: Each flight sortie requires a "three-stage" radiometric calibration: capture data from a high-reflectance diffuse white panel before takeoff, mid-flight, and post-landing. Utilize an airborne Downwelling Light Sensor (DLS) to synchronously record incident irradiance, correcting the radiometric response of each frame in real time. Panel Utilization: Only use traceably calibrated Spectralon white panels (reflectance ≥95%). The panel must be kept perfectly level and perpendicular to the optical axis of the imager. When capturing white panel data, ensure that it is free from shadows or stains and positioned at an appropriate distance to fill the field of view. Record the panel serial number, timestamp, and environmental parameters for each capture. Dark Current Acquisition: Execute dark current acquisition prior to each takeoff (by covering the lens or utilizing an opaque lens cap) to record the detector's baseline noise. If ambient temperature variations during the flight exceed 5°C, mid-flight dark current re-acquisition must be performed.

Takeoff & Cruise: Execute automated flight paths. After takeoff, climb to the preset altitude before entering the mission flight line. Maintain line-of-sight flight throughout the operation and closely monitor real-time attitude data returned by the ground station (pitch/roll angles should be <±5°). If attitude limits are exceeded, the system can automatically trigger a re-flight of that specific strip. Data Monitoring: Continuously observe the hyperspectral pseudo-color imagery and frame rate counter displayed on the ground station to verify normal imaging and ensure zero frame drops. Monitor remaining storage capacity and system temperatures (major component temperatures should be <50°C). If image anomalies are detected (such as banding, screen tearing, or signal saturation), abort the mission immediately and troubleshoot the cause. Emergency Protocols: In the event of sudden meteorological changes (abrupt wind increases, sudden heavy rain), low battery alerts, or video downlink interruption, initiate the one-key Return-to-Home (RTH) command. Prioritize downloading captured data immediately after landing to prevent data loss. Record any anomalous events and their corresponding handling measures.

Data Export Protocol: Immediately following the flight, export raw data (hyperspectral cubes, POS data, DLS data) from the airborne storage media. Adopt the naming convention of "Date+SurveyArea+Sortie" for files, and concurrently generate a data acquisition log containing route parameters, environmental conditions, and anomaly records. Data Backup: Secure raw data by backing it up to at least two independent storage devices (mobile hard drive + cloud storage/server). Perform a preliminary data quality assessment: verify whether any prominent striping, frame drops, or saturation exist across bands, and ensure that POS timestamps are strictly aligned with image frames. Equipment Maintenance: Clean the lens, fiber optic end-faces, and instrument chassis after each operation using specialized cleaning tools (air blower, absolute ethanol + lint-free wipes). Inspect the dampening gimbal and connecting cables for any signs of damage. Store equipment in a moisture-proof container (humidity <60%) and conduct regular charge-discharge maintenance on batteries. Execute wavelength and radiometric calibrations semi-annually, and update firmware and calibration parameters quarterly.

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