sITE

SURVEY

Topographic

Using a combination of drone-based photogrammetry and traditional ground-based survey methods, Geo-4D are able to generate ultra-high resolution digital surface models, orthomosaic imagery and CAD feature extraction.

Photogrammetric mapping uses drone based imagery to triangulate a dense grid a 3D points across a site. When combined with cm-accurate RTK GPS, total station and laser scan data, ultra-accurate 3D feature extraction and elevation modelling can be rapidly performed.

 

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Geophysical

 

To enable detailed spatial imaging of the subsurface, we employ various geophysical techniques, including electrical resistivity profiling and multichannel seismics.

These datasets enable the structure and stratigraphy of the subsurface to be identified across large areas.

When combined with topographic and geotechnical/geological datasets, an accurate 3D model of a site can be produced.

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Geotechnical

To provide shallow geotechnical information, we can utilise a dynamic cone penetrometer, auger, and handheld cone penetration testing equipment. These can be used to provide information on sediment type, basic geotechnical parameters, and basic derived parameters.

These rapid in-situ test types are well suited to spatially extensive projects with a depth of interest of 2-3 m below ground level, such as onshore and intertidal cable and pipeline burial projects.