What is the main purpose of ISO 19115?

ISO 19115 is an important standard within the realm of Geographic Information Systems (GIS), specifically focused on the structuring and documentation of metadata. Its primary purpose is to specify the information that should be included in a metadata document, which serves to describe the data's content, quality, condition, and other characteristics. This is crucial for data discovery, understanding, and ensuring the proper use of geographic data.

By establishing a clear framework for metadata, ISO 19115 enhances interoperability and facilitates effective sharing of geographic information among users and systems. This standard helps ensure that users can accurately assess the relevance and reliability of geographic data, which is essential for informed decision-making.

In contrast, the other options pertain to different aspects of GIS that are not the focus of ISO 19115. Data storage formats, data visualization guidelines, and geographic information sharing protocols are important components of GIS management and operation but fall outside the scope and intent of ISO 19115.