So if my first setup was at 1 backsighting 5 and foresighting 2, my last setup would also be at 1 backsighting 5 and foresighting 2. I would traverse around until I was re-occupying my first occupied point and then turn closing angles. In that scenario - a closed traverse with no external reference - I would start out with the instrument either at 1 backsighting 5 and foresighting 2 or at 2 backsighting 1 and foresighting 3. I just want make sure I take the proper steps getting there.
Then average the data? Or do I go into the Cogo menu and choose traverse at this point?ĭo I have to make sure these closing point numbers (6 aka 1) or (7 aka 2) are a certain assigned number or can they be whatever number as long as it's the same number that I originally started my job with such as 1 and 2?įrom there I think I understand what I need to do as far closure. I then set point 3 once I move ahead to point 2 back suggesting 1 and so fourth.ĭo I then come back around and when occupied on 5 I do an averaged observation f1/f2 to point number 1. Station setup creating a point number one at N:5k E:5k Elevation=100 do I leave the control point check box unchecked?Īnd take a compass reading to my back sight and I apply it to the azimuth to my back sight which will be point number 2 that will then give a coordinate to the point after it records the distance and vertical angle. If using the sample below of a sketch of a recent traverse I start a new job in an assumed system scale factor being 1.0 applying. If you close it in Access you can get a raw closure, then balance the angles and get an adjusted closure, then perform a Compass rule adjustment. It's amazing how many things are easier to do in Access than they are in TBC. I find the TBC Compass adjustment to be pretty wonky, but they just put it in there so hopefully they'll improve it. You can close the traverse in the field in Access, or adjust it in TBC. Obviously, any slop in the GPS points will get thrown into your traverse if you adjust it. If it's an open traverse between, say, two GPS pairs, designate them as Control points if you want to close it in Access. Always use the same point numbers for the same points in Access/TBC. Lee D, post: 345124, member: 7971 wrote: If it's a closed loop you should set up on your initial station and turn closing angles backsighting the last station and foresighting the initial backsight point.
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