GB/T 39624-2020 in English
VALIDTechnical specification for underwater topographic survey of airborne lidar
- Issued on:2020-12-14
- Implemented on:2020-12-14
- File Format:PDF
- Delivery:Via email within 5 business days
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《GB/T 39624-2020机载激光雷达水下地形测量技术规范》由TC230（全国地理信息标准化技术委员会）归口，主管部门为自然资源部(测绘地理)。
Introduction
Interpretation of the core content of the standard
This standard specifies the full-process technical requirements for underwater topographic surveying using airborne laser radar systems, and is applicable to surveying and mapping operations in waters with a depth of ≤50m. The technical system includes a complete chain of spatial benchmark establishment, data collection specifications, processing procedures, and results acceptance.
Key Technical Indicators
| Result Scale | Point Cloud Density (points/m²) | Plane Error (m) | Elevation Error (m) |
|---|---|---|---|
| 1:500 | ≥16.00 | ≤0.5+0.025D | √(0.05²+(0.005D)²) |
| 1:1000 | ≥4.00 | ≤1.0+0.025D | √(0.10²+(0.005D)²) |
| 1:2000 | ≥1.00 | ≤2.0+0.025D | √(0.15²+(0.005D)²) |
Note: D represents the water depth value, in meters; the plane accuracy is limited to 2 times the mean error
Analysis of implementation points
Equipment selection requirements
LiDAR system must meet the following requirements: Laser repetition rate ≥ 50kHz, IMU attitude accuracy better than 0.005°, GNSS sampling rate ≥ 1Hz. The equipment is especially required to provide original waveform data and format description.
Flight operation specifications
Route design must comply with the following requirements: Lateral overlap ≥ 10%, Inspection route ratio ≥ 1%, Altitude and speed meet the density formula of Pd=f/(v·H). Operations must be suspended in sea conditions above level 3.
Data processing flow
- Waveform denoising and classification (land/water waveform)
- POS/IMU joint solution (time synchronization accuracy ≤1μs)
- Point cloud refractive index correction (default value 1.34)
- Strip stitching (plane error < average point distance)
Standard evolution analysis
Compared with traditional photogrammetry, this standard introduces airborne laser radar technology with three major breakthroughs: water penetration capability (Kd≤0.3m-1), operation efficiency increased by 5 times, and elevation accuracy reached centimeter level. Appendix A/B standardizes the waveform and point cloud metadata formats for the first time, providing a basis for data traceability.
Implementation Suggestions
- Quality Control: It is recommended to add a wave compensation algorithm and relax the sea condition limit from level three to level four
- Equipment Configuration: 532nm blue-green laser is preferred to improve water penetration performance
- Data Fusion: Combine multispectral data to assist in bottom sediment classification
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