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A language defines the rules for written and oral communication, which makes use of that language. Books, magazines, flyers, newpapers and letters, all these are representations of communication. On the GEF language page the syntaxis of the GEF language is described. This page describes the currently known forms of communications in GEF. Since GEF has a lot to do with standardisation, all written info in GEF is standardised and should be registrered. An analogy: a printed book has been registered and can be easily retrieved by its ISBN, so all written GEF files should be registered as well. Intentionally there aren't two different books with the same ISBN. 

A dictionary and the synstaxis form the rules of a language. Yet as different books as Homers Illias or "Modern day gardening in the Namibian dessert" can be composed, using the same language. They are merely different expressions. The same is valid for GEF files, they can be dealing with pore pressure measurements, Cone Penetration Tests or even measurements using image processing techniques.

A specific type of measurement which uses GEF for the storage of data, is called a standard. Where the analogy with books and language does not stand up for GEF standards, is that a GEF standard is a form -a kind of template- for a specific type of measurement. Many measurements can be stored in as many different files, using the same specific GEF standard.

There are two advantages of registring a GEF standard:

  • other users with similar measurements can use the same specific standard for their data.
  • confusion is prevented, no one else can use the same name for a standard dealing with a different type of measurement.

Public 

Public standards are public, i.e. there is no fee or obligation connected to the use of the standard. Nevertheless a standard remains the intellectual property of the organisation or person that has conceived the standard. Standards are subject to improvements. After an improvement or extension the release, version or update must be changed. This will ensure that standards remain unique and distinct, like an ISBN. It prevents confusion about the contents of a file.

Changes  

If you think that a standard needs an update, there are two options.

  1. Contact the organisation that has conceived the standard and try to convince them that your update is needed.
  2. If the person or organisation rejects your proposal, derive a new standard, based on the old standard you wanted to improve. Give it a new distinct name and add your improvement.

ad. 1. If a standard is conceived and maintained by an organisation, this organisation has the right to make changes. When an alteration has been implemented, the release, version or update must be changed. Anyone can still use the previous version(s) of the standard. Nobody else is allowed to change the release, version or update of the standard. where is written "organisation" one may read "a public person" as well.

ad 2. It will depend on the reaction of the organisation which maintains the contents of a standard whether you will start a standard of your own. E.g. if you have proposed to add a column with the concentration of Hydrochloric Acid to a pore pressure file, it is not likely that your idea will be accepted. Nevertheless it may be brilliant for your situation, so you can start a new standard, with a different name.

There are four simple tools to manipulate, check or convert GEF files. Each tool has a page of itself, describing the possibilities and restrictions of the tool. On each page you can follow the link to the download section. All tools are written for the Windows platform.

 

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Table of public GEF-standards

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NameSMARFDescriptionVersionContact
GEF-Bore-ReportRDescription of (Dutch) soft soils, obtained by boring technique. Text in Dutch.1.0.0National standards
GEF-CPT-ReportRCone penetration Test (CPT) (1999)1.0.0National standards
GEF-CPT-ReportRCone Penetration Test (CPT) (2000)1.1.0National standards
GEF-CPT-ReportRCone Penetration Test (CPT) (2004)1.1.1National standards
GEF-CPT-ReportRCone Penetration Test (CPT) (2006)1.1.2National standards
GEF-DISS-ReportRDissipation test during a CPT.1.0.0National standards
GEF-Sieve-ReportRParticle size analysis. 1.0.0National standards
GEF-BOURDON-MeasurementMMechanical pore pressures1.0.0Deltares, The Netherlands
GEF-IPDISP-MeasurementMDisplacements via Image Processing1.0.0Deltares, The Netherlands
GEF-PLATE-MeasurementMSettlement via Settlement Plate1.0.0Deltares, The Netherlands
GEF-PPT-MeasurementM1 Pore pressure transducer. General purpose. 1.0.0Deltares, The Netherlands
GEF-PR-MeasurementMPore pressures via Piezo Resistive element1.0.0Deltares, The Netherlands
GEF-Pt100-MeasurementMTemperature via the Pt100 resistive transducer1.0.0Deltares, The Netherlands
GEF-SP-MeasurementMPore pressures via Stand Pipe1.0.0Deltares, The Netherlands
GEF-VWP-MeasurementMPore pressures via Vibrating Wire transducer1.0.0Deltares, The Netherlands