In GIS, what is 'metadata'?

Metadata in GIS refers to data that provides information about other data. It serves to describe the content, quality, condition, and other characteristics of the data. Metadata is essential because it helps users understand the context, creation process, and limitations of the data they are working with, which is vital for evaluating the data's relevance and reliability for specific applications.

For instance, metadata can include details such as who collected the data, how it was collected, when it was collected, and how accurate it is. This information is crucial for users to make informed decisions about how to use the data appropriately. In a GIS setting, well-documented metadata enhances the usability and interoperability of geospatial data among different users and applications.

The other options, while related to aspects of GIS, do not encapsulate the core definition of metadata:

• The visual style of a map pertains to presentation elements rather than descriptive data.

• Raw spatial data collected from satellites is the primary data itself, not information about it.

• Graphical representations are outputs of data analysis rather than descriptive metadata.

Thus, understanding metadata is fundamental for effective data management and utilization in GIS.