Complete Guide to Ground Control Points (GCP)
I. Basic concepts
1. Definitions and Functions
- definition: Fixed reference point with known coordinates DJI Mini 3 Pro Review: A New Standard for Lightweight Aerial Photography
- Key Features::
- Improve the accuracy of aerial photography measurements
- Ensure Geographic Correspondence
- Correcting mapping errors
2. Significance
- Improved mapping accuracy
- Ensure spatial orientation
- Verification of measurement results
II. Specification requirements
1. Physical specifications
- sizes: 50 x 50 centimeters
- Material Requirements::
- Weather resistant materials
- Non-slip surface
- Stabilized structure
2. Appearance
- Color Selection::
- High Contrast
- ease of identification
- Anti-glare treatment
- Marking Characteristics::
- Clear Center
- Defining the Boundary
- Identification Number
III. Principles of deployment
1. Quantitative configuration
- minimum requirement: 3 control points Risk Management Guide for Drone Flight: Key Elements for Safe Flight
- Recommended Configuration::
- 4-6 per square kilometer
- Increase in terrain complexity
- Boundary points must be set
2. Principles of distribution
- uniform distribution
- Avoiding centralized deployment
- Coverage of survey area boundaries
- Key location encryption
3. Location options
- Avoidance of masking
- Away from tall buildings
- Avoid dense vegetation
- Choosing an open site
IV. Measurement methods
1. Equipment requirements
- GNSS receiver
- RTK System
- PPK System
- High Precision Antenna
2. Measurement Procedure
- Benchmarking
- Horizontal calibration
- Coordinate Gathering
- Data Logging
3. Accuracy control
- Average of multiple measurements
- Checking known points
- Error Analysis
V. Maintenance management
1. Routine maintenance
- Regular Inspection
- physical integrity
- Positional Stability
- Marking clarity
2. Information management
- Coordinate Record
- Create a database The Complete Guide to Lithium Ion Batteries for Drones: Characterization, Use and Safe Management
- regular update
- Backup Preservation
3. Quality control
- Regular calibration
- Precision Evaluation
- Update Maintenance
Application Recommendations
1. different scene configurations
- flat terrain
- Standard Pitch
- Distribution of rules
- Boundary encryption
- Complex terrain
- Increase in density
- Topographic features
- Elevation Changes
2. Handling of special cases
- Large survey area
- Distribution
- encryption control
- Network Connection
- Precision Measurement
- Increasing density
- Multi-check
- Strict control
VII. Points to Note
1. Security considerations
- Avoid hazardous locations
- Ensure Stable Installation
- Regular Safety Checks
2. Efficiency gains
- Rational planning and deployment
- Optimizing the measurement process
- Improvement of operational efficiency
3. Quality Assurance
- Strict enforcement of standards
- Full Record File
- Regular Assessment Checks
Conclusion
Ground Control Points (GCPs) are critical elements in aerial surveying:
- Systematic deployment
- Science Planning
- rationalization
- Precise Measurement
- Regularization
- Standardized operation
- Complete Record
- Regular Maintenance
- Continuous Optimization
- Lessons Learned
- Technical Improvements
- Efficiency gains
Even in the popularization of RTK/PPK technology today, the reasonable configuration of ground control points is still an important guarantee to ensure the accuracy of the measurement, and it is recommended that the above principles be applied flexibly according to the specific situation in the actual operation.
