Since 1992, EOSYS has pioneered a set of methodologies which insures that the proper geological data are collected in due time, as the scale of investigations evolves with the project. Typically, preliminary studies are made at the 1/25 000 scale while detailed engineering requires a knowledge of the geology at the 1/1 000 scale or more. Geophysical and drilling surveys must be designed accordingly with this in mind and 3D geological models turn to be a key element in designing these surveys and in assessing the impact of geological uncertainties on project cost and risk of overrun. Significant savings in investigation and project costs have been achieved using this core of methodologies.(Download paper  - AFTES 1996 /.pdf zipped 1.3Mb ).
 

They can be applied to any type of project in civil engineering or undeground works. They include typically the following stages :
- field surveys
- remote sensing data selection / acquisition
- satellite imagery and aerial photo interpretation
- numerical stereophotogeology and terrain analyses (fault and slump zones detection)
- 3D synthesis of surface and underground data
- geometrical design and follow up of drilling and geophysical surveys
- 3D geological modelling following up projects from preliminary to detailed design
- volume calculation of excavation material, detailed mapping
- uncertainty analysis and quantification