Light Detection And Ranging is a remote sensing technology that enables the rapid and accurate development of true 3-dimensional images.
The technology is based on calculating the duration between an emitted laser signal and the reflected returned signal. Through advanced and precise movement of internal mirrors and servos, state-of-the-art lidar equipment can measure up one million unique points per second.
NGI's state-of-the-art expertise
- Lidar data collection optimization
- Lidar data processing and workflow development
- Integration of lidar data with ArcGIS and CAD environments
Services related to Lidar
Equipment at NGI
NGI conducts operational engineering work and research using two terrestrial lidar instruments: a Faro Focus 120 and an Optech Ilris LR. The Faro Focus is a high-speed phase based scanner that collects data at a speed of 1 million points per second, the range of equipment is however limited to 120 metres.
This technology is ideal for construction and tunneling environments where data collection time is limited and objects of interest are generally situated near to accessible scanning locations.
|
Faro Focus 120
|
|
The Optech Ilris LR scanner (as shown in the figure on top) is a long range time-of-flight based scanner capable of generating data at distances over 3 500 metres, however the speed of collection is limited to 10 000 points per second. This technology is ideally suited for slope monitoring and evaluation (specifically landslide, rockfall, snow avalanches).
Research and Development
- Optimization of data processing and results generation for drill and blast tunneling through custom programming and data management
- Shotcrete volume calculation
- Development of semi-automated structural geology measurements from lidar data
- Large scale landslide and rockfall mapping and monitoring
- Spatial and temporal monitoring through repeated scanning
- Snow avalanche evaluation of failure volume and path
- Building deformation monitoring and calculations during construction and renovation
Relevant Equipment and Software
Lidar related services
- Data collection and processing for drill and blast tunneling:
- Discontinuity measurements
- CAD vs. actual
- Overbreak
- Clearance
- Tunnel progression
- Water leakage into the tunnel
- Distribution and spacing of rockbolts
- Shotcrete thickness mapping and evaluation (image)
- Large scale landslide and rockfall mapping and monitoring
- Volume calcualtion of:
- Failed masses
- Unstable masses
- Building deformation monitoring and calculations during construction and renovation