Which standard relates specifically to metadata implementation for fundamental concepts?

ISO 19115-3:2016 is specifically designed to extend the ISO 19115 suite of standards to address metadata for the portrayal of geographic information. This standard focuses on the implementation of metadata related to fundamental concepts, including those concerning the portrayal of data, such as symbology and depiction.

Its purpose is to ensure that geographic information can be effectively represented in various visual formats, maintaining clarity and usability for end-users. This is critical in a GIS context, where effective communication of spatial data is essential for interpretation and decision-making.

In contrast, the other standards, while related to metadata, target different aspects or functions within the suite. ISO 19115 focuses broadly on the metadata framework itself without the specific focus on portrayal. ISO 19115-2, on the other hand, addresses the metadata for geographic services, and CSDGM (Content Standard for Digital Geospatial Metadata) is an earlier standard used primarily in the United States, which does not align with the framework established by the ISO series. Thus, ISO 19115-3:2016 is distinctly tailored to the portrayal of geographic information, making it the most appropriate choice for the question at hand.