Setting Control inside

Andy

That would be a long traverse with numerous short legs and up a very narrow staircase with a couple landings. I will have to think about it tomorrow. Maybe I could just set a couple GPS points in the elevator and wash it all through starnet. 🙂

Andy

No windows in the building?

I'd run right in one window, across the floor/hallway and out the other side, if possible.

Andy

You already said it was going to be hanging out there. I don't see how you can't not close it out, even with the short legs. Do any of the window open to close out?

Andy

think about the stair having usually a 4" gap, horizontally between stringers. use a folding rule and heavy plumb bob (between the stringers) to bring control from one floor to another. or at least it will give the network a few more redundancies. just a thought. i have been in your type of scenario twice. tough sometimes to formulate a plan of attack.

best of luck

Angelo

Loads of windows. Sealed windows. There is one right at the end of the hall near one of my existing control points which is near the elevator that needs control. Got to go a long way around to get there because the window is sealed.

I'm going to have to see about getting one of those plumb bob thingies. Might come in handy for traversing stairwells.

Andy

use the elevator!!!!

site the BS- push the up button- ZZZZZooooootttt to the top floor lock the door open site the foresite- flop foresite- reverse- push the down button.....

😉

it would be a hoot to film that operation on functioning elevator- and get people's reaction

or set up an RTK rover in the elevator......:-D 😀 😀

Traverse Plan

> Here is the planned route for the traverse. [...] Not sure what to do about the open leg running into the hospital and up a ramp to the second floor except lots of redundant angles and taking care with the observations.

Well, you may be overthinking this. It depends, of course, upon what the positional uncertainty target for all of the points is, but I wouldn't hesitate to just run the legs into the hospital twice, with completely independent setups of instrument and targets, and verify that the work is free of blunders by the analysis of variance in a least squares survey measurement adjustment program.

If the interior points don't meet the specification, just run the same interior lines again and add those measurements to the network adjustment. It will be much more reliable and painless than some jury-rigged series of connections using drastically different methods (with presumably unknown uncertainties).

OTOH, if you don't use least squares survey adjustment software with the ability to analyze the positional uncertainties of points on or connected to the network, you ought to rethink your life. It isn't working out so well. :>

Or....as was suggested....

Use RTK in the elevator.

RTK is always the best choice, inside or out.

Lost in the Ozone,
Tom Bryant PLS
Saint Louis MO

Or....as was suggested....

> Use RTK in the elevator.
>
> RTK is always the best choice, inside or out.

Yes, but you'll need to run the rover into the building to get the shot before it loses lock. :>

Or....as was suggested....

LOL... Now that's funny, i don't care who you are. We're just not moving fast enough. :clap:

Or....as was suggested....

indoor RTK works as long as you wear a tinfoil hat.

Andy

If you have access to the roof, and the stairwell extends to the roof, set a control point on top of the rail at the intersection. It is a tricky but doable setup, and you are looking right down the gap between stairs, sometimes you can see all the way to the ground floor if done right. You may have to manipulate a point in line with the open doorway to get a decent distance for a backsight, make sure you can get lock with a 'bot or can see your backsight without hanging over the rail, have put myself in that position before and refused to hang over the rail, too acrophobic to even consider it. If you have a 90° eyepiece (do they even make them for today's total stations?) all problems solved.

Back to the Windows

Have a talk with the Building Engineer or Head of Maintenance. Many times "Sealed" windows have a way of being opened using special keys.

Back to the Windows

I have a special sledge hammer "key". 🙂

Back to the Windows

I always carried a "big red key" while working in the field. We never knew what might need to be "unlocked".

If you shoot as close to perpendicular as possible through a closed window, what's the likely error? Angle should be fairly good. Distance might have to be adjusted a mm or two.

The distance correction could be estimated by comparison with somewhere you can open and close a window of similar thickness.

Not even going to bother with that.

work is done. Processing the results.

I hope you used a ground plane on that rover in the elevator.

> I hope you used a ground plane on that rover in the elevator.

lol...the 6 foot ground plane (with the build in compass) keeps hitting the elevator door...open...close...open...close...

time calculate the VDoP and the geoid model...

DDSM