3D terrain models: DSM, DTM and point clouds

What you get

DSM and DTM rasters (GeoTIFF at the cell size you need), a classified point cloud (LAS/LAZ: ground, vegetation, buildings), a textured mesh (OBJ/FBX) and web-ready 3D Tiles. Contours and cross-sections on request.

Applications

• Slope and drainage analysis
• Visibility and shadow studies
• Architectural visualisation and simulation
• Landslide and slope monitoring

Slope, aspect and drainage analysis; visibility and shadow studies; architectural visualisation and urban simulation; landslide and slope monitoring; dam, quarry and landfill monitoring; a base for games and visualisation.

Photogrammetry or LiDAR?

Photogrammetry is cost-effective and high-resolution in open terrain, and produces textured models. LiDAR sees the ground beneath vegetation and works in low light. We recommend one or a combination, depending on what the project needs.

Accuracy and resolution

Point density depends on flight altitude and sensor; absolute accuracy on ground control and RTK/PPK. Vertical and horizontal errors against checkpoints are reported at delivery.

How it works

1. ScopingWe confirm the site location and extent, the deliverables you need and the accuracy required, and check airspace permissions and site conditions.
2. Flight planning and ground controlOverlap, flight altitude and ground sampling distance (GSD) are set to meet the spec; ground control points (GCPs) are surveyed with GNSS where required.
3. Data captureThe site is flown to plan, capturing imagery and position data with RTK/PPK positioning.
4. Photogrammetric processingImages are aligned, a dense point cloud and surface model are generated and tied to the GCPs, and accuracy is verified against independent checkpoints.
5. QA and deliveryDeliverables are produced in your coordinate reference system (e.g. ITRF96 / TM zone) and file formats, and handed over with an accuracy report.

File formats

GeoTIFF (DSM/DTM), LAS/LAZ, OBJ, 3D Tiles

Services behind this deliverable

Related deliverables