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Use of Tolerance field

Update:11-30Source: network consolidation
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Does anyone know when the tolerance field is used with Oracle Spatial?
- Is it used when creating indexes? If I change a tolerance value do I need to recreate the index?
- Is it used within the RELATE operators or other operators where tolerance is not specified?
Cheers,
David

The Best Answer

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A quick clarification:
Tolerance is used when creating the index using the old quatree indexes as stated above. Oracle recommends using Rtree indexes, and one of the smaller benefits of Rtree indexes is that you don't have to recreate your indexes when you change the tolerance.
Tolerance is the distance two coordinates need to be so Oracle doesn't consider them as the same coordinate. It is used all over the place, include operators (as correctly stated above), but also geometry validation routines (no redundant coordinates allowed, also a polygon can't have an edge within tolerance of another edge or it is self-intersecting), distance (if the two geometries are within the tolerance value apart, then the distance is 0), unions, intersection, and so forth.
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