Integrity = validity + completeness
ACM Transactions on Database Systems (TODS)
An introduction to spatial database systems
The VLDB Journal — The International Journal on Very Large Data Bases - Spatial Database Systems
Obtaining Complete Answers from Incomplete Databases
VLDB '96 Proceedings of the 22th International Conference on Very Large Data Bases
Towards quality metrics for OpenStreetMap
Proceedings of the 18th SIGSPATIAL International Conference on Advances in Geographic Information Systems
Completeness of queries over SQL databases
Proceedings of the 21st ACM international conference on Information and knowledge management
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Geographical databases are often incomplete, especially when built up incrementally and by volunteers. A prominent example is OpenStreetMap. Often such databases contain also metadata saying that certain features are completely captured for certain areas. We show how to use such metadata to analyse in which areas queries return a complete answer. Such "completeness areas" can be computed via standard spatial operations. Still larger completeness areas can be derived if not only metadata but also the actual content of the database is taken into account. Finally, we discuss which challenges arise if one wants to practically utilize the completeness metadata in OpenStreetMap.