AGSi Standard / General

Specification of AGSi

This standard sets out a schema and rules that define AGSi. However, only a relatively small number of objects and attributes are mandatory, and in many cases the schema permits alternative methods of implementation. This standard does not provide a specification for the use of AGSi. Where AGSi is to be provided, the end user (hereafter: specifier) shall provide a specification detailing their project specific requirements for the AGSi data set to be provided.

The specification should cover the following, as applicable:

• Version of schema to be used
• Codes and vocabularies: AGSi or a specified alternative
• Use of model subsets
• Use of limiting areas for model elements
• Use of model boundaries, or limitations, including whether top boundary needs to be defined
• Permitted geometric form of model(s), e.g. 3D volumes or volumes from surfaces
• If volumes from surfaces used, whether top, bottom or both surfaces to be defined for each element
• Methodology for representing intermittent layers
• Permitted file formats for external geometry data
• Extent of complementary data to be provided
• If exploratory holes are required, whether holes are to be modelled in addition to the geological segments. Also, preference for use of sets.
• Extent of metadata to be provided, e.g. require all 'recommended' attributes to be completed where applicable, or provide a detailed specification
• Encoding requirements

The above are in addition to particular requirements relating to the interpretation methodology and the nature of the data/models to be provided. These are outside of the scope of this standard.

Where no specification has been provided, or where a data set has been created speculatively in anticipation of future sharing, the producer/modeller should carefully consider the issues listed above. The producer/modeller should document the approach taken, which should take into account, as far as reasonably practical, foreseeable interoperability issues.