Geospatial boosting raises document scores when their locations are near the user or another reference point. It adds geographic proximity to text-based relevance functions such as BM25, so ranking combines keyword matching with location. section 3.2.2
A search pipeline can calculate distance from a document’s location to user latitude and longitude, then transform that distance into a boost. Solr function queries can combine this proximity signal with keyword, freshness, and popularity scores. section 3.2.2
