The Aarhus Workbench uses the Geophysical Relation Database (GERDA) for data management and data storage.

The benefit from storing data in a documented format can not be underestimated. Data are stored for the future in a well defined format, data can be exchanged between contractors and the client and data can be managed across different surveys carried out by different contractors.

GERDA is a comprehensive database developed for storing geophysical data and inverted 1D and 2D models. All sounding points in the database have coordinate and elevation information making the database ideal for integration with any GIS system. As GERDA serves as the national Danish geophysical database hosted at the Geological Survey of Denmark and Greenland (GEUS) it is very thoroughly documented. Find out more about GERDA.

The GERDA database is scalable from storing data from a few Schlumberger soundings to storage on a national scale. The database exists in Access 97 format for small scale applications, in Firebird for large scale applications and in Oracle for management on the national scale. The Aarhus Workbench support the Access97 and the Firebird versions.

Data in GERDA

GERDA holds raw and processed data for the following data types:

• Ground based TEM in any configuration*
• SkyTEM – airborne TEM*
• HEM – helicopter frequency domain data*
• Earth conductivity meters – e.g. EM31/38 data*
• Geophysical logs, e.g gamma-, normal-, conductivity-, caliper-, fluid conductivity- and density logs*
• DC – geoelectric multielectrode data*
• Reflection seismic
• Schlumberger soundings*
• Wenner profiles*

*These data types are supported in Aarhus Workbench.

GERDA stores 1D models for all data types and 2D models for CVES data.

More Information

More information about the database GERDA is on:

• The GERDA homepage at GEUS
• Diagram of the database data model in pdf format.
• Description of the tables and fields (GERDA homepage) - in English.