A UAV LiDAR and Photogrammetry Survey of a former landfill and refuse site in Witton, Northwich for Geoterra on behalf of Coopers Geo-Environmental Engineers and Cheshire West & Chester Council.

FlyThru were appointed by partners Geoterra on behalf of Coopers and Cheshire West & Chester Council to carry out a UAV survey using photogrammetry and low level LiDAR techniques on a former refuse and landfill site adjacent to the River Weaver in Carey Park, Northwich. The survey data was required by both Coopers and Cheshire West & Chester Council to enable them to generate a 3D model of the site and monitor the former landfill where methane gas is extracted and especially the river embankments adjoining the River Weaver. Previous topographical surveys were carried out using lines every 100 m along the river embankments, which missed significant detail within the site.

In partnership with Geoterra’s experienced geospatial engineers FlyThru utilised a bespoke heavy lift UAV equipped with a high definition DSLR camera and Velodyne LiDAR sensor to fly over the former landfill and refuse site, generating a large multi-path multi return laser scan point cloud and photogrammetry. The point clouds were then post processed to produce an extracted vegetation ‘bare earth’ Digital Terrain Model. Ground control points were set up across  the  site  and  surveyed  to  OSGB 36 National Grid.

We provided the clients Coopers and Cheshire West & Chester Council with a with a range of key deliverables including a Digital Terrain Model, Ortho-rectified mosaic photography (.tif), contour plan and a 3D LiDAR point cloud in .xyz, .dxf and .las formats. Future surveys will then be compared to the base survey to monitor and analyse for any movements of the main tip and river embankments.