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Advanced LiDAR Capability
Equipped with the latest in world leading Airborne Laser Terrain Mapping (ALTM) technology, our Optech Gemini Multipulse LiDAR records 3D elevation data at 167kHz. The Optech LiDAR features multi–pulse data capture enabling more efficient and economical data collection with the added advantage of real–time medium format (39 Megapixel) digital camera imagery (in either Infra-Red or True Colour) to be captured simultaneously. Utilising the camera combined with the LiDAR provides a viable option in critical incident response or high volume aerial survey requests.
ALTM Optech 167KHz LiDAR with integrated Medium Format 39 Megapixel ROLLEI Digital Camera. Coupled with a LITTON LN–200 IMU inertial position and orientation system with integrated airborne GPS.
LiDAR (Light Detection and Ranging) is an optical remote sensing technology that measures properties of scattered light to determine the range and⁄or other information of a distant target. Using Laser pulses, the range to an object is determined by measuring the time delay between transmission of a pulse and detection of the reflected signal.
LiDAR technology is being successfully applied to mapping road networks in Victoria, and mineral resource companies have employed our LiDAR for quarry mapping and green field planning. The integrated medium format ROLLEI Digital Camera is also being utilised as an alternative to film based solutions for rapid image acquisition and processing. The digital camera can readily achieve 0.12m ground pixel resolution when flown at 1000m or 0.22m pixel resolution can be achieved when flown at 6000ft.
The benefits and applications of LiDAR are enormous for rapid production of Digital Elevation Models and elevation products through its push–broom scanning technique that creates a point cloud of the terrain surface. Our multipulse 167KHz LiDAR can undertake corridor surveys, electric transmission power line surveys, and is highly advantageous for forestry mapping where the LiDAR can both measure and penetrate the tree canopy, thus when viewed, tree lines can simply be turned on ⁄ turned off as your planning and management queries require. Aerial surveys can even be performed at night!
Contact us today to find out how you can take advantage of the latest in Laser measurement technology with our ALTM Optech 167KHz multipulse LiDAR.
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LiDAR Measurement Process & Production
The project will be flown with Photomapping Services’ ALTM Optech 167KHz LiDAR, with IMU and airborne GPS. A medium format (39 Megapixel) ROLLEI digital camera captures photography along the LiDAR flight path. Production typically involves LiDAR being flown on first available day with suitable weather at the required scale, with one or more base stations for airborne GPS. GPS files are processed to provide the trajectory of the plane and the LiDAR device. Range files are then processed, position files matched and corrected using overlap of range files. Final LiDAR measurements are corrected and classified into ground and non–ground measurements. DEM is created from the ground return points. Data supplied in specified format or as raster tiles and ASCII format files.
Quality Assurance Provisions
- LiDAR to be calibrated at regular intervals prior to and post measurement.
- Overlapping passes provide redundancy in the LiDAR measurement.
- Sufficient Ground Control to provide redundancy and as a check on LiDAR data.
- Fortnightly reports to be provided to outline status of project to client
- Digital photography also provides visual verification of LiDAR data.
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LiDAR Sample 1:
- Combined LiDAR Elevation Data
with 15cm digital camera imagery.
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LiDAR Sample 2:
- LiDAR Elevation Data with pseudo
colour against elevation.
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LiDAR Sample 3:
- LiDAR Elevation Data, Non-Ground On.
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LiDAR Sample 4:
- LiDAR Elevation Data, Non-Ground Off, Ground Generalisation .
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LiDAR Sample 5:
- LiDAR Elevation Data, Vegetation On.
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LiDAR Sample 6:
- LiDAR Elevation Data, Vegetation Off, Ground Generalisation.
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Bathymetric Solutions
Photomapping has access to the Optech SHOALS 3000 and 1000 bathymetric LiDAR survey instruments available under lease arrangement. Ideal for marine and coastal surveys where conventional systems are most limited in shallow water, coastal zones, hazardous areas, and when rapid environmental assessment is required. SHOALS technology can be combined with our Optech ALTM LiDAR for complete terrain ⁄ marine mapping. The SHOALS 3000 measures at a rate of 3000Hz to a maximum depth of 50m.
Elevation and bathymetric derivative products such as spot heights⁄depths and contours are resolved through our established DEM production procedures. Customised bathymetry products or marine charts can readily be produced in-house.
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