Realm-based spatial data types: the ROSE algebra
The VLDB Journal — The International Journal on Very Large Data Bases
Inclusion of New Types in Relational Data Base Systems
Proceedings of the Second International Conference on Data Engineering
Qualitative Spatial Reasoning: A Semi-quantitative Approach Using Fuzzy Logic
SSD '89 Proceedings of the First Symposium on Design and Implementation of Large Spatial Databases
SSD '97 Proceedings of the 5th International Symposium on Advances in Spatial Databases
Uncertainty Management for Spatial Data in Databases: Fuzzy Spatial Data Types
SSD '99 Proceedings of the 6th International Symposium on Advances in Spatial Databases
Capturing Fuzziness and Uncertainty of Spatiotemporal Objects
ADBIS '01 Proceedings of the 5th East European Conference on Advances in Databases and Information Systems
A system of types and operators for handling vague spatial objects
International Journal of Geographical Information Science
K-nearest neighbor search for fuzzy objects
Proceedings of the 2010 ACM SIGMOD International Conference on Management of data
Inconsistency issues in spatial databases
Inconsistency Tolerance
Spatial query processing for fuzzy objects
The VLDB Journal — The International Journal on Very Large Data Bases
Geometric properties of interval type-II fuzzy regions
Journal of Intelligent & Fuzzy Systems: Applications in Engineering and Technology
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Uncertainty management for geometric data is currently an important problem for (extensible) databases in general and for spatial databases, image databases, and GIS in particular. In these systems, spatial data are traditionally kept as determinate and sharply bounded objects; the aspect of spatial vagueness is not and cannot be treated by these systems. However, in many geometric and geographical database applications there is a need to model spatial phenomena rather through vague concepts due to indeterminate and blurred boundaries. Following previous work, we first describe a data model for fuzzy spatial objects including data types for fuzzy regions and fuzzy lines. We then, in particular, study the important class of metric operations on these objects.