Metadata in a geographical database serves multiple purposes, including describing the content and structure of the database, providing information about the data sources used, and documenting the methods used to create the database.

Projection is not a type of metadata, but rather a transformation applied to the data to display it in a particular way.

Documentation in a geographical database serves multiple purposes, including providing instructions on how to use the database, explaining the meaning of the data in the database, and providing information about the history of the database.

Metadata is not a type of documentation, but rather data about the data in the database.

Metadata is about the data in the database, while documentation is about the database itself. Metadata is more technical, while documentation is more user-friendly. Metadata is created by the database administrator, while documentation is created by the data users.

Metadata and documentation do not directly impact data security.

All of the above factors should be considered when creating metadata and documentation for a geographical database.

SDMX is not a common standard for metadata in geographical databases.

A data dictionary in a geographical database serves multiple purposes, including defining the structure of the database, describing the meaning of the data in the database, and providing information about the data sources used.

Layer file is not a type of data dictionary, but rather a file that defines the symbology and other properties of a layer in a GIS.

A lineage report in a geographical database serves multiple purposes, including documenting the history of the data in the database, providing information about the data sources used, and explaining the methods used to create the database.

Data quality report is not a type of lineage report, but rather a report that assesses the quality of the data in the database.

A spatial reference system in a geographical database serves multiple purposes, including defining the coordinate system used in the database, providing information about the projection used in the database, and ensuring that all data in the database is georeferenced.

Temporal coordinate system is not a type of spatial reference system, but rather a system for representing time in a database.

A projection in a geographical database serves multiple purposes, including transforming data from one coordinate system to another, displaying data in a particular way, and improving the accuracy of the data.