What is a GeoPackage best described as?

A GeoPackage is best described as an open standard based on SQLite for storing geospatial data. This allows for the storage of vector and raster data, along with associated attributes and metadata, in a single file. The use of the SQLite database format makes GeoPackages efficient and easily portable, supporting a wide range of GIS applications and platforms.

The versatility of the GeoPackage format is significant because it serves as a container that can encapsulate multiple layers and types of spatial data while maintaining a relational structure. This is particularly useful in scenarios where multiple datasets need to be stored together in a cohesive manner.

In contrast to the other options, a multimedia file format for geographic data does not capture the structured nature and database capabilities of a GeoPackage. Similarly, referring to it as a proprietary format for raster images does not accurately reflect its primary function and open standard status. Additionally, while raster data compression is related to data management, it does not define the essence of what a GeoPackage represents regarding data types and storage methodologies.