We provide topographic and asset mapping services using a range of data capture methodologies including aerial LiDAR and terrestrial LiDAR.
- Satellite imagery
We have the capability to process satellite-acquired RGB, infrared and multispectral imagery from very high resolution (<0.5 m/2 ft GSD) to coarse imagery (>30 m/100 ft GSD). The datasets can be orthorectified by means of supplementary ground control provided by NM Group. Analysis can be performed on the datasets including NDVI vegetation mapping, wetland extraction, and the extraction of vectors to produce infrastructure datalayers.
- Aerial LiDAR
A fixed-wing platform is the most rapid means by which to conduct a wide-area LiDAR survey. Typically flying at speeds of 120 kts/62 m/s, we can rapidly cover a survey area and acquire highly accurate data of a high resolution. The LiDAR system produces millions of survey points and these are used to generate a precise terrain surface that accurately portrays slope, gradient and elevation, as well as any features above ground. This system can be coupled with RGB, NIR and multispectral cameras where required.
A LiDAR sensor mounted on a helicopter platform will capture an incredibly dense dataset and has the ability to map complex linear assets through higher manoeuvrability. This allows us to lower the positioning time for the airframe and to capture the survey dataset as efficiently as possible. During flight, millions of infrared laser pulses are emitted for every kilometre and mile flown making the accuracy of rotary LiDAR systems ideal for engineering projects. For every project, the accuracy of the survey measurements produced from the aerial LiDAR system is checked, reported and signed-off prior to delivery to our clients.
You can read more about aerial LiDAR surveys in our blog here
- Terrestrial LiDAR
Terrestrial LiDAR is a non-invasive technique that allows the placement of equipment and personnel in non‐hazardous areas. This mitigates risk to personnel, and prevents the need to power down machinery or de‐energise structures, while the survey is being conducted. The terrestrial LiDAR scanner can be deployed to survey a structure in 3D, capturing the exact location and interaction of all components. This is particularly useful for the production of CAD models in complex plant environments.
You can read more about terrestrial LiDAR surveys in our blog here
- Mobile mapping
Mobile mapping is a laser scanning system operated from a moving vehicle that that provides 360 degree coverage of the area. Multiple survey vehicles, such as vans, 4×4’s and boats can be used to conduct the mobile mapping survey and these scanners are supported by a GPS or an IMU unit. These systems can achieve an accuracy of <1cm/0.4 in and are ideally placed for asset management and maintenance activities for asset corridors and overhead features, for example in the roads and highways or railway sectors.
You can read more about mobile mapping in our blog here
- Forward looking imagery
We are able to take a high resolution oblique image of assets during flight, and attach these to the asset they represent within the PLS-CADD™ model. This is used as an asset record and as a means for visual inspection by engineers. For example, for the electricity transmission and distribution sector high-resolution oblique imagery of structures for defect identification can be captured and these images attributed with circuit references, structure numbers, dates and times taken, as well as easting and northing.
- Forward looking thermal infrared
The forward looking infrared sensors detect thermal infrared radiation from a heat source. This can be used to detect defects in electrical assets so that asset managers can quickly identify problem areas for maintenance work.
- Forward looking ultraviolet (UV)
The use of an Ultraviolet (UV) camera to look for corona discharge on electrical components that may be a sign of faults.
UAVs enable LiDAR and imagery collection for smaller projects, where manned aircraft would be cost-prohibitive. We deploy a range of micro-class UAVs to support asset management and engineering initiatives. UAVs complement larger surveys where subsequent, localised inspection is required. Applications include:
1) Detailed component inspections where aerial patrols have identified possible defects that require confirmation.
2) Updates to PLS-CADD™ models after small facility changes have been made.