Vertical Error with Conventional Total Station
I have been using trimble robotics for the past 10 years where you can close out traverses with very little error. I recently started my own buisness and could not afford the 30k price tag that comes with robots these days so I purchased a Nikon N 5" conventional gun which is the new version of the NPL 322. Horizontal error is pretty small but I have noticed that I usually have a decent amount of vertical error after setting a traverse point and setting up on it/backsighting the point that I set it from. Usually 5 hundredths at 300' and sometimes 8 hundredths at around 600'. Ive used conventional total stations early in my career but do not remember how good the vertical was. Is this common or is there something going on with my gun? My rod height and instrument height are always correct and I am running survey pro. Maybe there is some kind of collumation that could be done? Thanks for your input.
There's a built-in feature for adjusting the vertical on my Nikon DTM-520. Easy peasy.
I used it every day for 71 remeasures of a traverse used to detect movement. I picked a sight on the horizon about 10 miles away and measured the vertical angle face-right and face-left and let the instrument do the adjustment per the prompting.
Most definitely have to do F & R (foresight and backsight) to carry good elevations on a traverse. When doing that I have often had traverses that closed vertically better than horizontally and I never measured vertical to better than the nearest 0.01' using a 5" gun.
Paul in PA
Thanks guys. I will do the adjustment and let yall know how it turns out
If the vertical is adjusted and the tilt is adjusted, then I would expect very good results. In any case, if you need better than 0.05' at 500', I would consider an F&R observation (of each point) to be best practice for a 5" instrument.