PYRAMID BUILDING
14 DRYDEN ROAD
BILSTON GLEN IND EST
LOANHEAD
EH20 9LZ
CASE STUDIES

Aspect Land and Hydrographic surveys of Irvine, Scotland, have for a considerable time now been integrating the use of UAV (unmanned aerial vehicle) drones and multibeam sonar in the coastal and bathymetric sectors resulting in rapid and cost effective surveying of near shore features. 

 

This combination of technologies uses sophisticated software to process images taken during a typical flight of 40mins with a Trimble UX5 Aerial Imaging Rover, in combination with the seabed profile from an R2Sonic 2024 high resolution multibeam echosounder operating at 400kHz.

The Trimble UX5 was selected as the best platform because of its flight duration and stability in the turbulent coastal environment. This combination allowed the survey deliverable to be optimised in the short window available at low water states of the tide.

The UX5 aerial survey delivers high resolution topographic data in the form of dense point cloud XYZ and a geo-referenced ‘orthophhoto’ image, of typically 3-5cm resolution. This methodology provided a robust solution in achieving accurate data in inaccessible areas where it was not possible to reach on foot and dangerous to reach by boat.

A suitable overlap of data was acquired by the multibeam echosounder as the survey vessel was able to access intertidal areas at high water states of the tide. Topographic data acquired from the drone and bathymetric data acquired from the multibeam system underwent rigorous QC checks in combination with random spot levels surveyed by a Trimble R6 RTK GPS rover over the survey area.

Recently, Aspect Land and Hydrographic Surveys Ltd have been asked to conduct fixed wing UAV surveys using the Trimble UX5, over several locations, including those which are in areas that might normally be considered No-Fly zones for conventional aircraft.

 


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