Drone LiDAR, photogrammetry and high definition terrestrial laser scanning of water infrastructure in support of planning and design.


Consulting engineers required spatial and visual data of a dam, the buildings and surrounding areas to complete geotechnical assessment, inspection, planning and design of upgrade works. This included a high resolution terrain model of the entire site, photorealistic 3D model for visualisation, and high definition survey of water infrastructure including the pump station.

Due to the large area, hard to access nature of the dam and multiple stakeholder involvement, conventional survey would be inefficient and costly.

Project Scope
Drone LiDAR & Photogrammetry
Drone LiDAR & Photogrammetry
Terrestrial Laser Scanning
Terrestrial Laser Scanning
Digital Twin
Digital Twin

Diospatial developed a complete reality capture spatial solution that utilised the most ideal capture techniques to best achieve the spatial and visualisation needs of the project.

First, a robust network of ground control points were established throughout the site to ensure all spatial data was geo-located and spatially accurate.

A complete spatial solution to inform multiple aspects of the project’s planning, design and construction phases.

Drone LiDAR was used to create the digital terrain model. The LiDAR was captured at a very high point density to allow for high resolution and accurate terrain modelling, even in areas of vegetation cover. From the LiDAR point cloud, ground and non-ground returns were classified and from this a surface mesh model was produced to show the bare earth terrain beneath vegetation. Elevation contours and rudimentary watershed analysis was extracted from the LiDAR point cloud.

Drone-based imagery was captured and used to create a spatially accurate and rich 3D visualisation of the site. Specific attention was given to the down stream left abutment where imagery was captured underneath the tree canopy. In post-processing, Diospatial data technicians “removed” the tree canopy from the 3D model to allow for inspection and clear visualisation of the terrain beneath.

High definition terrestrial laser scanning was completed of the pumping station to produce a high definition, high accuracy point cloud to support detail design of upgrades.

All spatial deliverables were compiled in to a web-based 3D digital twin and hosted via an online portal, Pointerra. This allowed project stakeholders to easily view and interrogate the data, take measurements and collaborate, without the need for specialist software or powerful computing hardware.

Revit model of water pump station was created as part of the survey of water infrastructure
Laser Scan data was used to prepare an As-Built Revit model of the pump station, on which engineers could design upgrades and understand various project interfaces.
Terrain models and surface mesh derived from LiDAR to support survey of water infrastructure
Drone LiDAR was used to capture a LiDAR point cloud which was then classified for ground and non-ground returns to produce surface mesh model to support geotechnical risk assessment. Further geospatial analysis was completed to produce elevation contours and watershed analysis.
Photogrammetry model of vegetated hillside with trees digitally removed
Diospatial data technicians removed the tree canopy in post-processing to provide improved visualisation of the downstream left abutment for geotechnical inspection purposes.
Photogrammetry model of pump station with zoom in section for close visual inspection and survey of water infrastructure
High detail photogrammetry model was produced of the entire site for 3D visualisation and close inspection.