What is ISO 19117 – Portrayal of Geographic information about?
ISO 19117 specifies a conceptual schema for describing symbols, portrayal functions that map geospatial features to symbols, and the collection of symbols and portrayal functions into portrayal catalogues. This conceptual schema can be used in the design of portrayal systems. ISO 19117 allows feature data to be separate from portrayal data, permitting data to be portrayed in a dataset independent manner.
Note: ISO 19117 is not applicable to the following:
- Standard symbol collection (e.g., international chart 1 – iho)
- A standard for symbol graphics (e.g., Scalable vector graphics [svg])
- Portrayal services (e.g., Web map service)
- Capability for non-visual portrayal (e.g., Aural symbology)
- Dynamic rendering (e.g., On the fly contouring of tides)
- Portrayal finishing rules (e.g., Generalization, resolve overprinting, displacement rules)
- 3d symbolization (e.g., Simulation modelling)
Who is ISO 19117 - Portrayal of Geographic information for?
ISO 19117 on geographic information is useful for:
- Geospatial industries
- Geographic data operators
- Research and development team
- Software developers/engineers
- Software companies/ IT firms
Why should you use ISO 19117 - Portrayal of Geographic information?
Geographic information refers to occurrences that are either implicitly or explicitly linked to a location on the Earth.
ISO 19117 establishes a conceptual framework for the depiction of data, including symbols and functions. For the purposes of depicting features on maps and other display mediums, depiction functions link features to symbols. This schema defines the structure and interrelationships between features, depiction functions, and symbols using classes, attributes, associations, and operations. ISO 19117 separates the data's content from how it's represented, allowing the data to be presented in a way that's not dependent on the dataset.
Overall, ISO 19117 can be used to expand the concept of portrayal rules to include more generic portrayal functions, include symbol definitions (including parameterized symbols), include both portrayal functions and symbols in portrayal catalogues, and define a core portrayal schema with extensions for specialised cases.
