Innovative Land Surveying Techniques

Covering a greater area using low cost UAVs.

Dr Jonathan Byrne

Urban Modelling Group

3D Surveying Services

Ireland

Traditional GIS Mapping

Nadir(Vertical) Photogrammetry

Digital Elevation Model (DEM)

Urban Modelling Group



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Structural Analysis

Wind Tunnel Modelling

UAV Mapping

Structure From Motion



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Scanning Applications



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Advantages:

  • Low cost
  • Capture multiple angles
  • Ease of data capture
  • Centimetre accurate models
  • Real-time feedback

Disadvantages:

  • Limited range
  • Limited battery life
  • Legal restrictions

Kilmacredock Survey

Area: 3.03 km², 749.79 acres, 303.43 hectares

Vertical vs Oblique

Vertical

2.2 Hectares

30 Degree Oblique

4.6 Hectares

40 Degree Oblique

10 Hectares

Results:

3D Model



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Digital Elevation Model

Accuracy:

  • Model accuracy at 100 meters: 5 centimeters
  • Model accuracy at 50 meters: 2 centimeters
  • Georeference accuracy with GPS: approx 1 meter
  • Georeference accuracy with RTK: approx 2 cm

Conclusions:

  • Oblique image data can be used with SFM
  • A much greater area can be captured with a quadcopter
  • Geo-referenced and orthomosaic output from model

Future Work:

  • Coordinated UAV scanning
  • Prespecified and marked GCP
  • Simultaneous Localisation and Mapping
  • Improvements in Structure From Motion algorithm

Thanks

umg.ucd.ie

3dsurveyingservices.ie