Definition
The framework of constraint databases provides a rather general model for spatial databases (Paredaens et al. 1994). In the constraint model, a spatial database contains a finite number of relations that are represented as a finite union of systems of polynomial equations and inequalities, although conceptually viewed as possibly infinite sets of points in the real space.
More specifically, in the polynomial constraint database model, a relation is defined as a boolean combination (union, intersection, complement) of subsets of some real space Rn (in applications, typically n = 2 or 3) that are definable by polynomial constraints of the form p(x1, …, x n ) ≥ 0, where p is a polynomial in the real variables x1, …, x n with integer...
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Kuijpers, B. (2017). Linear Versus Polynomial Constraint Databases. In: Shekhar, S., Xiong, H., Zhou, X. (eds) Encyclopedia of GIS. Springer, Cham. https://doi.org/10.1007/978-3-319-17885-1_696
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