What accuracy can I expect?

Typical topo accuracy is +/- 1-3 cm horizontal and +/- 2-4 cm vertical with good control and clear surfaces. As-built checks on critical features can be tighter using total station and scan control.

Can you match our CAD standards?

Yes - we deliver layered DWG/DXF with your layers, blocks, and linetypes, plus TINs/contours and feature-coded points. A README documents projection and units.

Can you combine conventional survey with LiDAR/UAV?

Yes - we integrate GNSS/total station observations with terrestrial, mobile, and UAV LiDAR to maximize coverage, efficiency, and accuracy.

Topographic & As-Built Surveys

Overview

Convex Geomatics Ltd. delivers professional topographic surveys and as-built surveys that integrate seamlessly with engineering and construction workflows. We blend GNSS/robotic total stations, terrestrial/mobile/UAV LiDAR, and targeted conventional shots to produce authoritative basemaps, surfaces, and feature linework aligned to your CAD/GIS standards and project datum.

From urban infill sites and transportation corridors to industrial facilities and municipal works, our Calgary-based team provides engineering-grade mapping with clear documentation and transparent QA/QC—ready for design, tender, field layout, and construction close-out.

Deep as-built expertise: Extensive record of acceptance surveys on bridges, plants, municipal utilities, and transportation structures—delivered on tight timelines and in live facilities.
Tight-tolerance verification: Anchor bolts, embedded plates, rails, pipe inverts, slabs, and finished grades checked against design with documented control and independent check shots.
Methods matched to complexity: Robotic total stations for precision stake/measure and SLAM for dense geometry, reflectorless shots where access is constrained.
Defensible deliverables: Layered DWG/DXF built to your templates, comparison heatmaps and deviation tables, photo-referenced notes, and a clear QA/QC sign-off packet.
Challenging environments: Traffic control, confined-space procedures, night work, shutdown coordination, and GNSS-challenged sites handled safely and efficiently.

Typical As-Built Tolerance

±5–15 mm*

Verification Methods

Robotic TS; TLS/SLAM

Deliverables

Layered DWG/DXF; deviation heatmaps/tables

Control & Checks

Benchmarks, scan targets, independent shots

*Per project specification, access constraints, and control quality.

Deliverables

CAD Packages

Layered DWG/DXF with linework, blocks, and annotation
TIN surfaces, breaklines, and contours (0.25–1.0 m)
Title blocks, legends, and sheet sets (optional)

Surfaces & Points

DTM/DSM rasters and hillshade (GeoTIFF)
Classified point clouds (LAS/LAZ)
Feature-coded survey points (CSV/SHP)

Formats

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

Workflow

Scope & standards (layers, symbology, tolerances, datums)
Control (GNSS/total station, benchmarks, check shots)
Acquisition (terrestrial/UAV/mobile LiDAR + conventional shots)
Processing (classification, breaklines, surface modeling)
Compilation (feature coding, linework, attribution)
Packaging (CAD/GIS deliverables and map sheets)
QA/QC (residuals, RMSE, coverage, completeness)

Features Mapped

Surface & Grading

Ground, pavement, curbs/gutters, sidewalks
Breaklines at edges and grade changes
Contours and spot elevations

Utilities & Sites

Valves, manholes, inlets, hydrants, poles
Fences, walls, signs, guardrails, lighting
Building footprints and key as-built details

Structures

Headwalls, culverts, bridges/abutments
Foundations, slabs, pads, anchors
As-built alignment and geometry checks

As-Built Services

Acceptance surveys on bridges, plants, and municipal works
Critical features: bolts, embeds, rails, inverts, slabs, grades
Verification: robotic TS with TLS/SLAM scan control
Tolerance checks & independent QA; deviation heatmaps/tables
Deliverables: layered DWG/DXF with redlines & photo docs

Technology

Survey Instrumentation

GNSS RTK/PPK, robotic total stations
Digital levels for benchmarks
Reflectorless shots for inaccessible features

Scanning

Mobile LiDAR (vehicle-mounted) for corridors and roads
UAV LiDAR for rapid site coverage
SLAM for GNSS-challenged areas

Gallery

FAQ

Can you match our CAD/BIM standards and layers?

Yes — send your layer list, linetypes, blocks, and sheet templates. We deliver DWG/DXF aligned to your standards (feature coding, symbology, styles) plus TINs/contours as required. A README documents projection, vertical datum, units, and file structure for easy onboarding.

How do you ensure as-built accuracy on critical features?

We combine robotic total station measurements, mobile LiDAR/SLAM where helpful, and independent check shots tied to verified control. Results are summarized in a sign-off pack with control diagrams, residuals/RMSE, and clear acceptance notes against specified tolerances.

Can you match our project coordinate system and vertical datum?

Yes — we work in common EPSG codes or custom site grids. We verify/establish control, apply the appropriate geoid for orthometric heights, and can deliver both ellipsoidal and orthometric elevations. All transformations, units, and benchmarks are documented in the README and QC report.

Need a reliable topo or as-built package?

Request a Quote