What pavement metrics do you report?

IRI/roughness, rut depth, crossfall/superelevation, lane and shoulder widths, curb and gutter position, vertical/side clearances, and sight-distance checks depending on scope.

How accurate are your measurements?

Typical absolute accuracy is ��2�C5 cm with relative precision of ��5�C10 mm for geometry features, contingent on control quality and environment.

What deliverables are provided?

CAD/GIS layers for pavement features, QC report with statistics (RMSE, residuals), cross-sections and profiles, clearance/encroachment checks, plus colorized point clouds and rasters as required.

Road Quality Assurance | Convex Geomatics

Overview

We measure and verify road condition and geometry using mobile LiDAR, profilers, and imaging. Our workflows compute IRI/roughness, rutting, crossfall/superelevation, lane and shoulder widths, curb & gutter position, vertical/side clearances, and sight distance delivered as CAD/GIS layers with a rigorous QC report.

Relative Precision

±10–20 mm

Absolute Accuracy

±2–5 cm*

Pavement Density

≥ 500 pts/m²

Capture Mode

Traffic-speed

Imagery

Panoramic/RGB optional

*Depends on GNSS conditions and control/checkpoint strategy.

Metrics & Tests

Ride & Surface

IRI/roughness indices (per lane)
Rut depth; crossfall/superelevation
Texture indicators (LiDAR/imagery-derived)

Geometry & Safety

Lane/shoulder widths, curb & gutter, edge drop
Vertical/side clearances (bridges, signage, barriers)
Sight-distance & envelope checks

Compliance

Design tolerance checks vs. alignment
Change detection vs. previous surveys
Construction lot acceptance (QA/QC)

Deliverables

Core Data

Classified point clouds (LAS/LAZ) incl. curb/edge
DTM/DSM, contours, slope & hillshade rasters
Colorized point clouds and orthophotos (optional)

Engineering Products

IRI, rutting, crossfall, width maps (GeoTIFF/SHP)
Cross-sections, profiles, and clearance reports
Feature extraction: lane lines, signage, barriers, markings

Formats

LAS/LAZ GeoTIFF DWG/DXF SHP/GDB CSV PDF maps

Workflow

Route planning & safety plan; control layout
Acquisition: mobile LiDAR + profilers at traffic speed
Trajectory solution: GNSS/IMU PPK/PPP (SLAM if needed)
Strip alignment: boresight, overlap residuals, bundle adjustment
Cleaning & classification: pavement, curb/edge, obstacles
Computation: IRI, rutting, crossfall, widths, clearances
Packaging: CAD/GIS layers, profiles/sections, maps
QA/QC report: checkpoints, RMSE, density, conformance

Technology

Sensors

High-rate multi-return LiDAR (up to ~1M pts/s)
Inertial profilers & wheel odometry
Panoramic/RGB cameras for inventory & markings

Positioning

Tightly coupled GNSS/IMU with PPK/PPP
Local control & independent checkpoints
SLAM assistance in GNSS-poor areas (as required)

Software

TerraScan LP360 ArcGIS Global Mapper iTwin Custom QA scripts

Gallery

Road Rutting detected from Mobile Mapping Data

Road Surface extracted from mobile LiDAR data

Point Cloud of a Road from mobile LiDAR scanner

FAQ

Do you need lane closures for data collection?

Typically no - vehicle-mounted systems collect at traffic speed following an approved safety plan. We supplement with trolley/backpack mapping in complex or pedestrian areas.

Can you align results to our design alignment or site grid?

Yes. We support common EPSG codes and custom site grids. Results can be reported by station/offset and compared to design tolerances.

What about GNSS-challenged areas like underpasses?

We combine tightly coupled GNSS/IMU with SLAM methods and local control/checkpoints to maintain accuracy. QC reports include residuals and RMSE.

Need objective, corridor-wide QA metrics?

Request a Quote