# File Geodatabase XY Resolution and XY Tolerance

Here - http://gisintelligence.wordpress.com/2011/04/19/limiting-xyz-geometry-drift/ I found the description of XY Resolution and XY Tolerance in "Arcgis World".

I have a question - my cadastral data in shapefile format have accuracy 1 cm. So, if I want to work with my data in Arcgis File Geodatabase I should use XY Tolerance 0,01 m and XY resolution 0,001 m ( http://goo.gl/uqDrG

• is that ok? I mean - that values are proper for topology matters and so on?
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x,y tolerance

Your data has an accuray of 1 cm. With this accuray I would not use a x,y tolerance of 1 cm. During feature processing operations coordinates that fall within the x,y tolerance will snap to the same shared coordinate location. The maximum distance a coordinate could move to its new location is the square root of 2 times the x,y tolerance. If you use a x,y tolerance of 1 cm the maximum distance a coordinate could move is 1.4 cm. So the coordinates will move more (1.4 cm) than the accuray (1.0 cm) of our data. This image from esri help shows how coordintes will move:

I would use a tolerance of 0.1 cm.

resolution

The x,y tolerance should be coarser than the resolution. In ArcGIS the default value esri uses for the x,y tolerance is 10 times x,y resolution. If you use a tolerance of 0.1 cm you shold use a resulution of 0.01 cm.

(It is possible to use every value as tolerance and resolution (e.g. 0.5, 0.12345, 0.99 ...). But I like to use a resolution of 1.0, 0.1, 0.01, 0.001 ... This makes it more easier that the resulution grid of different projects (with different resolutions) fits together.)

Summary: I would use a x,y tolerance of 0.001 m and a resolution of 0.0001 m.

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Thanks for reply – Piotrek Jan 24 '13 at 14:57
@ piotrek: does the answer solves your question? Then you can mark the answer as "accepted" - see here. Or do you still need help? – Jens Jan 25 '13 at 12:27
Hi - I clicked button - "Was this post useful to you? Yes" - sorry, I'm new and I don't know about all rules here. Yes, Your answer was great, thanks! – Piotrek Jan 26 '13 at 15:25