Error of Closure> OK Larry
> I did make up a traverse and mis-closed by 0.15'.... I actually just created 5 lines and then made sure that one line missed closing by 0.15'
>
> I ran the closure (no adjustment) three times, using a different starting point.
>
> I annotated the interior angles and listed the distances to create my traverse file.
>
>
> The closures were different, ever so slightly and the error was different, ever so slightly.
> 1) 0.14845' 1 in 17716
> 2) 0.14816' 1 in 17751
> 3) 0.14975 1 in 17563
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> I see that you are RIGHT! (even though it does round to 0.15')
>
> Dtp
Your results are very odd. My experience with real world raw data sets (many hundreds over the past several years) is that the amount the closure varies is usually quite a bit. Typically the best ratio is 4 to 5 times the worst ratio. As in the example I posted above, the best (28437) and the worst (8667) are different by a factor of 3.28. That is a bit less than common variability.
Perhaps the person who gathered the data that started the discussion will send me his raw data file. If so, I will take a look at the numbers so we can see.
Larry P
>> This is why I find it humerus . . .
I find it (actually both of them) everytime when I get up in the morning.
Error of Closure> OK Larry
> I did make up a traverse and mis-closed by 0.15'.... I actually just created 5 lines and then made sure that one line missed closing by 0.15'
>
> I ran the closure (no adjustment) three times, using a different starting point.
>
> I annotated the interior angles and listed the distances to create my traverse file.
The difference is whether or not the angles close. If you created something with bearings only, then annotated the angles by the difference in bearings, you have perfect closure on the "angles". Without rounding errors, your linear error of closures will be "exactly" the same for each closure. Your errors are all different by 0.001' or less because of rounding and they are all essentially 0.15' error.
Make up a traverse with angles that don't close by, say 15". Your last bearing will create an angular gap. Now use the angles to create bearings from starting point to ending points. You will see a much larger difference in closures.
er...did that make sense?
