[EMAIL PROTECTED] wrote on 06/22/2007 06:06:48
PM:

> Hope I am not confusing things here - Precision basically describes the
> rounding policy to the topology operations (so they do not do more work
> then will be "saved" into the coordinates ).

I suspect that the Surveyor wants more of a "tolerance" on set comparisons.
For instance: circle.contains(pointA) would return true if pointA is
circle.radius plus or minus epsilon.  That way pointA doesn't have to be
spot-on but could contain some measurement error.

The existing "Precision" essentially deals with quantization error:
artifacts of storing the numbers in a digital computer.

"Tolerance" deals with measurement imperfections (due either to equipment
or operator induced error.)

Is that right?

Bryce


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