Wood and Jepsen Consultants (WJC) approached Kahuto about performing an aerial survey. WJC were creating scheme plans for the Sakoca area, which is an informal settlement. The decision was made to use drones for an initial site investigation survey as previously WJC found this task to be a huge time consumption.

The main data requested by our client was:

  • Geotagged high resolution aerial imagery

  • 0.1 m contours of the terrain

  • Digital Terrain Model

  • Digitization of buildings and coconut trees


In comparison to traditional surveying methods, our services were able to provide WJC with:

  • A large reduction in time spent gathering data

  • Reduction in risk

  • More detailed data


Capturing Aerial Images

Flights were conducted using a senseFly eBee drone. GCPs were placed by Kahuto, and the GCP coordinates were gathered by Wood and Jepsen.

Sakoca flight details

Area size: 0.15 km²

GSD: 3 cm/pixel

Number of photos: 284

Altitude: 128 m

Total flight time: 33 minutes


Processing was done with Pix4D, using the following coordinate


  • Image Coordinate System: WGS84

  • GCP Coordinate System: Fiji 1986 / Fiji Map Grid (egm84)

  • Output Coordinate System: Fiji 1986 / Fiji Map Grid (egm84)

In order to create an accurate DTM and contours, the point cloud created in Pix4D was manually classified to remove vegetation, buildings, cars, etc. 

Digitization of buildings and coconut trees were done using ArcGIS. 371 buildings in total were digitized.

Sakoca orthomosaic

Sakoca orthomosaic + digitized coconut trees

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Tel: +679 331 0949

Unit 1, Level 2

Carnarvon Street, Carnarvon Building 

Suva, Fiji 

© 2019 by Kahuto Pacific.