Keyphrases
- reverse nearest neighbor
- nearest neighbor
- multi type
- reverse k nearest neighbor
- user queries
- spatial databases
- r tree
- metric space
- query processing
- nearest neighbor search
- shortest path
- database
- index structure
- data objects
- spatial data
- relevance feedback
- search space
- search algorithm
- data structure
- similarity search
- range queries
- data sources
- keywords
- database systems
- databases