The effect of increasing the XY tolerance in the performance,

Question

I�??m wondering if increasing the XY tolerance (say 0.00000001) of a particular enterprise layer would slow down the performance.

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The reason for that is my enterprise layer may receive polygons of very small areas (due to conversions from CAD by using FME) and I don�??t want to consider these small areas as errors.

Thank you

Best

Jamal

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JamalNUMAN · Answer

First you'd need to specify what you mean by "increase".  Are you operating on 
a numerator or a denominator?  Changing from 0.001 meters (one millimeter) 
to 0.000000001 meters (10 nanometers) is decreasing the value, but increasing
the precision. Changing from 0.01 meters (one centimeter) to 0.1 meters (one
decimeter) increases the value and increases the tolerance.

I would say that increasing the default precision without justification for highly
accurate data (e.g., a scanning electron microscope) is wasteful of storage and
processing capability.  Increasing the tolerance value will add "fuzziness" to your
location data under some processing conditions; the full impact depends on the
data and the processes.

- V

Thank you Marco and Vince for the very useful input. Now, it is much more obvious for me

Best

Jamal

VinceAngelo · Answer

I�??m correct if I say YES. Increasing the XY tolerance will decrease the performance.

First you'd need to specify what you mean by "increase".  Are you operating on 
a numerator or a denominator?  Changing from 0.001 meters (one millimeter) 
to 0.000000001 meters (10 nanometers) is decreasing the value, but increasing
the precision. Changing from 0.01 meters (one centimeter) to 0.1 meters (one
decimeter) increases the value and increases the tolerance.

I would say that increasing the default precision without justification for highly
accurate data (e.g., a scanning electron microscope) is wasteful of storage and
processing capability.  Increasing the tolerance value will add "fuzziness" to your
location data under some processing conditions; the full impact depends on the
data and the processes.

- V

MarcoBoeringa · Answer

In the same context, what might be the effect on increasing the resolutions?

A potentially unwanted loss of accuracy / precision of the stored coordinates. With the default, you can reasonably store measurements up to millimetre precision, changing the default resolution to something like 0.1 m, will not allow that.

Also see this Help page:

The properties of a spatial reference

And mind the following quote from that page:

"Esri strongly recommends using the default x,y resolution in most cases because it has proved to perform quite well and can store adequate coordinate precision for most situations."

Also see this quite interesting Help topic. Although it is related to Parcel Fabrics, it gives some nice background regarding historic surveys / measurements and what "accuracy" they represented:

About accuracy