fsr (version 2.0.1)

spa_exact_inside: Check two spatial plateau objects for exact containment

Description

spa_exact_inside() checks whether a pgeometry object is completely inside of another pgeometry object.

Usage

spa_exact_inside(pgo1, pgo2)

Value

A Boolean value that indicates if a pgeometry is completely and certainly inside pgo2.

Arguments

pgo1

A pgeometry object that is either a plateau point, plateau line, or plateau region object.

pgo2

A pgeometry object that is either a plateau point, plateau line, or plateau region object.

Details

spa_exact_inside() is a Boolean function that checks fuzzy containment in the spatial plateau context. This Boolean function checks whether the components of pgo1 are contained in the components of pgo2 by considering their membership degrees and geographic positions. That is, it follows the classical definition of fuzzy containment of the fuzzy set theory.

In other words, this function checks if the (standard) intersection of pgo1 and pgo2 is exactly equal to pgo1. The other of operands affects the result.

References

Carniel, A. C.; Schneider, M. Spatial Plateau Algebra: An Executable Type System for Fuzzy Spatial Data Types. In Proceedings of the 2018 IEEE International Conference on Fuzzy Systems (FUZZ-IEEE 2018), pp. 1-8, 2018.

Examples

pcp1 <- create_component("MULTIPOINT((2 2), (2 4), (2 0))", 0.5)
pcp2 <- create_component("MULTIPOINT((1 1), (3 1), (1 3), (3 3))", 0.9)
pcp3 <- create_component("POINT(2 2)", 0.2)
pcp4 <- create_component("MULTIPOINT((1 1), (3 3))", 0.7)

ppoint1 <- create_pgeometry(list(pcp1, pcp2), "PLATEAUPOINT")
ppoint2 <- create_pgeometry(list(pcp3, pcp4), "PLATEAUPOINT")

# is ppoint2 completely and certainly inside ppoint1?
spa_exact_inside(ppoint2, ppoint1)

# The order of operands after the result
# ppoint1 is not inside ppoint2 since it has different points
spa_exact_inside(ppoint1, ppoint2)