Drone Mapping at a Glance
Drones have become the reference tool for geospatial data collection: fast, accurate and cost-effective compared to traditional methods (ground surveying, manned aircraft). Equipped with a high-resolution camera, LiDAR or multispectral sensor, a drone generates in a few hours datasets ready to use in GIS, CAD or BIM software.
Main Survey Types
Orthophotography
Orthophotography produces a georeferenced aerial image corrected for optical distortions and terrain relief. It enables accurate measurement of distances, areas and perimeters directly on the image. Typical resolution: 2 to 5 cm/pixel depending on flight altitude.
3D Modelling and Point Clouds
Through photogrammetry or LiDAR, the drone produces a dense point cloud from which you can derive:
- a Digital Terrain Model (DTM)
- a Digital Surface Model (DSM)
- a textured 3D mesh usable in Blender, Revit or Unreal Engine
Cadastral and Land Surveys
For land surveyors, drones accelerate boundary surveys and surface calculations. Accuracy reaches 2–3 cm in planimetry with ground control points (GCPs).
Construction Site Monitoring
Regular fly-overs (weekly or monthly) document construction progress, measure earthwork volumes and detect deviations from plans.
Volume and Stockpile Measurement
For quarries, open-cast mines and landfill sites, drone-based volume calculation replaces theodolite surveys. Accuracy is typically 1–3% depending on terrain complexity.
Accuracy Factors
The accuracy of a photogrammetric survey depends on:
- Flight altitude (lower = higher resolution)
- Number and accuracy of ground control points (GCPs)
- Image overlap (80–85% recommended)
- Processing software quality (Pix4D, Agisoft Metashape, DJI Terra)
Deliverables
- Georeferenced orthophotos (GeoTIFF)
- DTM / DSM (raster)
- Point cloud (LAS / LAZ)
- Processing report with accuracy metrics
- 3D model (OBJ, FBX)
Compatible Software
Drone deliverables integrate into: QGIS, ArcGIS, AutoCAD Civil 3D, Revit, Pix4D Mapper, DroneDeploy, Agisoft Metashape.