GTECH 709 Spatial relationships

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Presentation transcript:

GTECH 709 Spatial relationships Topological relationships .. and their importance

Spatial Relationships (1) Equals A is the same as B Touches A touches B Overlaps A and B have multiple points in common Contains A contains B

Spatial Relationships (2) Disjoint A shares nothing with B Covers A covers B Crosses A and B have at least one point in common B A A B A B

Ignore at your Own Risk What would happen if we ignored them? Mapquest and Google Maps would be useless Consider 500 road segments of your neighborhood collected with a GPS