Database queries that select geographic features based on location or spatial relationships such as intersection, containment, proximity, and adjacency, implemented using R-tree spatial indexing and filter-refine strategies per OGC Simple Features and SQL/MM Spatial standards.
Semantic Classification
Content
Query Types
- Intersection (does A intersect B)
- Containment (does A contain B)
- Proximity (what is near A)
- Adjacency (what is next to A)
- Buffer analysis queries
Implementation Technologies
- PostGIS GiST and SP-GiST indexes
- R-tree spatial indexing family
- OGC Simple Features standard
- SQL/MM Spatial ISO standard
- QGIS Select by Location tools