What is considered the base street layer used as a source for geocoding?

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The base street layer used as a source for geocoding is best described as reference data. Reference data typically includes detailed information about geographic locations, such as streets, addresses, and boundaries, which are essential for accurately converting addresses into geographic coordinates—an essential process known as geocoding. This type of data provides the foundational context needed for spatial analysis and supports various geographic queries.

While other types of data, such as base map data, may contain illustrative features useful for mapping, they do not necessarily provide the structured information required for address matching and geocoding. Similarly, spatial reference data relates more to the coordinate systems and projections used in GIS rather than the actual geocoding process. Layered geographical data might include multiple datasets for various geographic features but does not specifically capture the definition and role of reference data in the context of geocoding.