Posted By D G123 on 11/25/2008 at 10:18 PM
Looking for opinions....
network provided uses control values on "grid" coords. Combined factor
is given. Performed a closed traverse, utilizing the C.F., which is
less then 1, on this published control for integrity check and all is
Now it's time to stakeout a bridge (150' span) and associated structures.
supplemental closed traverse was perfromed near the proposed structure,
starting and closing to the same published point - however this
traverse was run using a CF of 1 (so none of the distances have been
adjusted for grid). This traverse closed for 1:50000. Do not intend to
adjust this traverse.
The quandry is this: Utilizing the factor
of 1 - distances measured between each supplemental control point are
the "truest" value, therefore stakeouts from the secondary control
points would suit the structure best. If you apply the project Combined
Factor to this supplemental traverse, distances shot between each
control point will be slighlty off. This could effect the layouts (very
slightly) if this is done from two different points.
Should I continue on using the coordinate results from the factor of 1 traverse? or readjust so all my control is on grid?
This has been an intriging discussion with some of my collegues. Thanks
Splitting hairs - Combined factor and layout
November 26, 2008