1) Geophysics is utilised primarily to identify target areas warranting detailed investigation and/or follow up, and can be used to delineate various phenomena including; profiling of bedrock topography and structure, location of voids, sinkholes and old mineshafts, mapping of the water table, and integrity testing of various surface and underwater structures.
- Airborne geophysical methods used include; gradient magnetometry, VLF-EM and HLEM, and multispectral radiometrics.
- Surface geophysical methods used include; seismic refraction and reflection, ground penetrating radar, electromagnetic conductivity profiling / sounding and imaging using the new Strataghem, 2D resistivity imaging, resistivity sounding, electrokinetic sounding (EKS), microgravity, magnetics, self potential and radon prospecting.
- Borehole geophysical methods used include; crosshole seismics, seismic tomography, and wireline logging.
2) Remote Sensing uses thermal infra-red, false-colour infra-red, multispectral thematic mapper and aerial photography for a variety of environmental monitoring applications including:-
- Methane 'hot spot' mapping on decommissioned landfills
- Thermal pollution of water bodies, groundwater seepage, vegetation stress identification and general landuse classification.
- Digital elevation models can be produced from stereo pairs for terrain visualisation in 3D and volumetric calculations.
3) Environmental Monitoring Software developed by Geo-Services International includes Monitor-Pro demonstrated at ESD 97
It is based on a spatial relational database which manages data from environmental monitoring activities. Validating data integrity ensures confidence in analysis in the context of all related information. Reporting, maps and graphs enable identification of trends and anomalies in space and time, illustrating conclusions for integration with reports. Flexible and customised development is driven by industry and regulators.
Geo-Services International (UK) Ltd