A key strength of Getech’s global spatial databases is the comprehensive attribution and referencing that is included. This is critical if explorationists are to use our interpretations with any confidence. These are supported internally by extensive and ever-expanding libraries of our primary data and supporting information, which our geoscientists can access and add to.
The audit trail
Part of the process of data management is having a thorough audit trail. All of Getech’s databases include information (as attributes and metadata) on the source of information generated. Each feature class has its own documentation providing information on what the data contains, a detailed description and explanation of attributes included in the attribute table (if appropriate) and examples of where, when and how the data is used. In addition, all materials used in generating our interpretations are stored digitally within Getech using bespoke and commercial file management systems and collaborative tools such as Google Documents and Evernote. This is especially important for large-scale work such as the global palaeogeographies, with their large teams of specialists.
All of Getech’s ArcGIS™ feature classes now include comprehensive attribution, reflecting the needs of users for an indication of data confidence and provenance.
Getech’s primary databases include the following :
Gravity and Magnetic databases
Stratigraphic (Points and Tops) database
This database comprises data for over 11,000 point locations around the world and includes over 73,500 ‘tops’ in wells, outcrops and pseudo-points. These also encompass 1D modelling points and qualifiers (additional sedimentological, petrological, geochemical and palaeontological data qualifying the broader definitions of the underlying polygons in ArcGIS™). Each point location is linked to a tops table, which provides further information arranged by stratigraphic age.
Line locations database
There are more than 8,000 line locations in Getech’s database which include seismic, well-correlations, structural cross-sections and chronostratigraphy charts.
The location lines are used to help with the palaeogeography mapping with the extents of lithologies and depositional environments; they are also used by the Structural Team to aid in their interpretation and analysis of the 1:1M structures.
Landsat and Radar (Remote Sensing) databases
Landsat data has long been publically available, but the skills to interpret this data correctly are highly specialised. Much of Getech’s onshore geological work in Africa has been based on analysis of Landsat and other remote sensing datasets. The radar-derived DEM data, SRTM30, SRTM3 and SRTM15 have been analysed as part of Getech’s extensive experience in Landscape and Drainage Analysis and palaeodrainage reconstuction.
Reference (citations) database (REFcite)
Getech have our own in-house Referencing database which currently contains more than 37,500 references. Our Database Team check each reference for useful geological information as it comes in so that it can be continually added to the reference data layers.
Geological maps are used as a first pass to create the digital geology feature class. These are then modified with Getech’s in-house data (bathymetry, SRTM3, gravity and magnetic derivatives, and our structural dataset) to provide a robust solution for surface geology.
3rd Party databases
We have also compiled an extensive number of 3rd Party databases to augment our own databases.