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I think this could be either a bug, or an issue with my understanding.

image below, why would the exact same feature class, put through the exact same geometry validator yield different results between readers

  • Top scenario in image is with Geodatabase File Reader
  • Bottom in image, is with File GDB reader

Hi @dfresh, I think it has been caused by a difference between implementations of extrenal libraries - Esri ArcObjects (GEODATABASE_FILE) and File Geodatabase Open API (FILEGDB).
Esri ArcGIS has some tolerance internally, so I suspect that the GEODATABASE_FILE reader (Arc Objects) could repair invalid geometries implicitly in some cases.

I'm interested in what happens if you insert the ArcSDEGridSnapper after the FILEGDB reader.

Hi @dfresh, I think it has been caused by a difference between implementations of extrenal libraries - Esri ArcObjects (GEODATABASE_FILE) and File Geodatabase Open API (FILEGDB).
Esri ArcGIS has some tolerance internally, so I suspect that the GEODATABASE_FILE reader (Arc Objects) could repair invalid geometries implicitly in some cases.

I'm interested in what happens if you insert the ArcSDEGridSnapper after the FILEGDB reader.

I agree. Maybe even try a CoordinateRounder after both of the readers and before the GeometryValidators..

What happens if you attach a GeometryFilter to each Reader?

Are they single part or multi-part features? Would de-aggregating help?

Note also that the ordering of the issues in the GeometryValidator can change the output geometries.

These links may also be useful:

https://knowledge.safe.com/articles/173/what-is-the-arcsdegridsnapper.html

http://edndoc.esri.com/arcsde/9.3/concepts/geometry/shapes/verificationrules.htm

http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//006z00000028000000

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