Road Science is excited to inform our customers that we can now offer high-speed surveying in motion using a Leica Pegasus Two Ultimate (P2U) Mobile Laser Scanner. The service is now available through Road Science and this is the only unit of its kind within New Zealand.
Benefits of the Mobile Mapper include:
The Mobile Mapper utilises point cloud and photogrammetric solutions to provide innovative ‘all you can see’ high resolution datasets, this equipment transforms the capturing and monitoring for projects and contracts.
A laser scanning sensor, multiple cameras and an Inertial Measurement Unit (IMU) combine to deliver survey datasets. In the P2U’s case, the point cloud is captured by a Z&F profiler collecting 1,000,000 points across 200 line scans per second to sub-centimetre accuracy. Photogrammetric data is stitched together
from six cameras taking photos every 0.5m – 10m. There are two additional external cameras used for pavement analysis assessments such as flushing, cracking, roughness and rut detection. Cameras capture 360° so they can analyse structures and other real-world features.
Richard Carter - firstname.lastname@example.org - 021 915 894
Graham Watson - email@example.com - 021 972 026
The FWD is a trailer mounted system that imparts a dynamic impulse to a pavement through an applied load or “falling weight” and then measures the resulting seismic response using geophones to measure the change in the pavement’s velocity or “deflection.”
The data generated from a FWD is one of the cornerstones of pavement design around the world. It is used extensively to evaluate the performance, durability and expected life of pavements.
It is mandatory on all NZTA and Auckland Transport reseal and rehabilitation sites.
The pavement response is analysed with Dynatest’s Evaluation of Layer Moduli and Overlay Design (ELMOD) to determine the elastic moduli and stresses of each modelled layer. ELMOD reports the weakest layer of failure, residual life and then provides optimum rehabilitation alternatives saving time and resource for our clients.
Our FWD testing conforms to Austroads ASTM AG:AM/T006.
Benefits of the Falling Weight Deflectometer:
• Automated and rapid structural pavement testing applicable to pavements all over the world.
• Determines individual layer modulus.
• Determines the layer of failure, rather than simply determining the bearing capacity.
• QA/QC of newly built pavements.
• Compares a range of rehabilitation options, including plane off and recycling rather than just applying overlays.
• The use of the FWD provides accurate, reproducible and repeatable structural data.
• Automated and real-time monitoring of the load cell, geophones, and data variations ensures high quality of collected data.
• Uses mechanistic-empirical analysis applicable to most of pavement structure.
Road Science has three high speed data surveying vehicles - the first generation Hawkeye 1000, and two of the new generation Hawkeye 1000’s.
These vehicles are operated by Road Science’s highly skilled technicians who survey roads right throughout New Zealand.
The Hawkeye survey vehicles use the latest in digital laser technology to accurately and continuously record road and pavement information, such as roughness and texture. This data is then related back to GPS or distance based instruments.
New to the Hawkeye 1000 is a GipsiTrac geometry module. The road geometry is recorded, in particular horizontal and vertical curvature, camber and superelevation. Geometric road designers can now have access to geometric and stress data in order to back up high-value treatment selections.
Hawkeye also has a profiler (a class 1 instrument, which is the most accurate type).
The laser attached to the profiler this is able to measure texture in accordance with AG:AM/T013 and roughness in accordance with AG:AM/T001.
Compliance to international standards:
• ASTM E950: Longitudinal profile
• AASHTO PP37: Pavement roughness
• ASTM E1845: Pavement macrotexture
• ISO 13473: Mean Profile Depth (MPD)
The Hawkeye processing toolkit software ensures that the survey database can be reviewed, edited and processed quickly and efficiently. The data from each module can be compared against other results and exported to pavement and asset management systems. The Hawkeye data viewer is an office-based programme that enables detailed assessment of sites to be completed by providing zoom and measurement tools for reviewing processed surveys.