Project Objectives
High Exposures was commissioned to conduct a LiDAR survey on an 800-meter section of the Nepean River. The objective of this survey was to provide highly accurate elevation data to assist in the design and planning for the redevelopment of the area. Given the complexity of the terrain and the need for precise data, a drone-based LiDAR system equipped with Real-Time Kinematic (RTK) positioning was employed.
Colourised point cloud LiDAR data set shown on the left. The image on the right shows the vegetation removed after ground points were classified.
Methodology
Drone-Based LiDAR System:
A high-resolution drone-mounted LiDAR system was used to capture topographic data over the designated 800m stretch.
The LiDAR system was integrated with RTK to ensure high positional accuracy.
Ground Control and Validation:
Ground control points (GCPs) were strategically placed throughout the survey area to validate the LiDAR data.
The collected LiDAR data was cross-referenced against these GCPs to ensure the highest possible accuracy.
Data Processing and Accuracy Assessment:
The raw LiDAR data was processed to remove noise and extract the ground surface.
The final dataset achieved a vertical accuracy within 50mm, meeting the project’s precision requirements.
Deliverables
Ground Extraction and Digital Terrain Model (DTM):
A refined ground-extracted dataset was produced, isolating the ground points from tress and other vegetation
A high-resolution Digital Terrain Model (DTM) was generated to support redevelopment planning.
- A 0.5m contour file was created to assist the design team with planning
Planning and Design Support:
The DTM was provided to engineers and planners to facilitate informed decision-making regarding land grading, flood analysis, and infrastructure development.
The dataset improved efficiency by reducing the need for additional site visits and manual topographic surveys.
Conclusion
The LiDAR survey conducted by High Exposure successfully provided accurate and reliable elevation data for the section of the Nepean River. By utilising drone-based LiDAR with RTK positioning and rigorous ground control validation, the project achieved an exceptional level of accuracy within 50mm. The resulting DTM proved invaluable for the planning and redevelopment efforts, ensuring that engineers and planners had the necessary data to make informed decisions. This project highlights the effectiveness of advanced LiDAR technology in supporting large-scale urban and environmental redevelopment initiatives.
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