Features of the PaveScout include
- High-Resolution Surface Imaging System using a line scan camera with patented photometric lighting.
- Rutting Lasers and Cameras produce 2048 points across a 4 metre lane width.
- Texture Point Lasers.
- Four Panoramic Environmental Cameras (each with a resolution of 5 megapixels).
- A Dual-Frequency GPS System integrated with the Laser Ring Gyro Inertial measurement.
- Wheel Encoder for Chainage Measurement.
The PaveScout uses two high-power line generating lasers, in combination with high-speed, high-resolution laser cameras to measure the profile of the road surface over the full lane width of four metres. This system is used to determine the rutting, texture depth and roughness measures. Each of the scans can be meshed together to produce a topography model. Rutting is determined using the 2048 point laser profiling system for the entire four metre scan width.
The system complies with Austroads Standards and can be configured with a number of different algorithms including; fixed, straight-edge, sliding-straight edge and taught-wire methods. Roughness measures are extracted from the PaveScout laser system which produces a highly accurate profile in the direction of travel. A six axis laser gyro inertial measurement system is combined with a GPS system to determine the full flight path of the vehicle. The result is a far more precise detection of position. When this is combined with the laser profiling data, the full road geometry can be obtained.
Texture depth is measured, using both the laser line profiler and point lasers. The system allows calculation of sensor-measured texture depth, and mean-profile depth as per the Austroads and ASTM standards. The PaveScout uses the detailed surface imaging system to transversely position the high-density laser within each lane, correcting for driver position error. RoadLoack also enables change in the road surface, from one year to the next to be determined using these aligned line scan camera images. For historical purposes the system incorporates two conventional point laser units to enable data to be provided in the more traditional way. The PaveScout system is validated in accordance with the Australian standards. Repeatability and bias is determined for each driver as per the standards. The four 5 Megapixel cameras fitted to the PaveScout offer digital imagery for asset detection and can be displayed in both the Portal 4D software package and in the Web Data Viewer.
The PaveScout achieves full crack mapping and condition assessment across the full line width with the unique photometric lighting system. Artificial lighting achieves a one millimetre surface resolution with one 4 metre wide camera image. Post-processing of the data allows the quality to be verified. Surface defects displayed in the surface image can be linked to the laser profiling system outputs, allowing improved understanding of the surface defects across all features of the road. Using photometrics, the visual components of the road can be separated from the structural components of the road surface. Within the resultant images, cracking and other road defects become far more obvious, easing the tasks of crack detection and automating the process.
Surface defects are extracted from the photometric images into crack times and fed into a severity rating. The resultant automated crack maps are reviewed by data analysis technicians to ensure quality crack mapping is produced. The results can then be exported into PDF based maps, excel tables, or geospatial data formats, or customised for specific database systems. The Portal 4D analysis and reporting package is a total road environment recreation package. It allows the user to manage the data and to view all features in the one package. High-level functionality has the ability to view collected data, view automatically extracted features, tag extra features, graph road conditions and generate reports. Portal 4D complements existing PMS and road management systems by providing more detailed analysis.
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