What is the difference between Intersect & Overlap in ArcGIS Server?

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When you run a Query Task on the ArcGIS Server's REST Endpoint, you need to give a spatialRel

There are two spatial relationships which are quite similar: esriSpatialRelIntersects & esriSpatialRelOverlaps

The JavaScript API documentation has this to say about them:

SPATIAL_REL_INTERSECTS Part of a feature from feature class 1 is contained in a feature from feature class 2.

SPATIAL_REL_OVERLAPS Features from feature class 1 overlap features in feature class 2.

If one is querying a Polygon featureclass by using a Polygon as an Input, what is the difference between the two?



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