What is a mosaic dataset primarily used for?

A mosaic dataset is primarily used for managing and displaying raster data. It serves as a powerful tool within Geographic Information Systems (GIS) that allows users to integrate multiple raster datasets—such as aerial imagery, satellite images, or scanned maps—into a single, seamless layer. This is particularly useful for applications such as land cover mapping, environmental monitoring, and planning, where expansive geographical areas might need to be represented.

By using a mosaic dataset, GIS professionals can efficiently access and visualize large volumes of raster data without having to deal with the complexities of individual raster management. This includes supporting operations like dynamic tiling, which allows the dataset to load only the required imagery at the appropriate resolution based on the viewer's location and zoom level. Consequently, it enhances performance and facilitates analysis over wide geographic extents.

Other choices provided do not align with the core functionality of a mosaic dataset. For instance, storing 3D feature models or vector data does not pertain to mosaic datasets, as they specifically cater to raster formats. Creating real-time maps is a broader GIS capability that does not specifically relate to the unique features of mosaic datasets. Thus, the correct option reflects the primary purpose of mosaic datasets within GIS applications.