Trimble Business Center-adjustment
I had this same problem with TGO too.
We don’t do nice neat and tidy Office Building ALTAs where you start on a GPS control point, backsight another GPS control point and traverse around a little with plenty of GPS sprinkled in. A fire station topo and boundary would look like that but not a big Forest boundary survey.
What we do is a lot of Forest traversing with weird looking networks. We get GPS baselines in where we can or close it conventionally, whatever it takes. Say I start on a road (not a GPS control point) and traverse a third of a mile easterly. Then I go back and traverse a third of a mile westerly from the starting point. Then I do various other traverses in there and tie things together as I can with GPS baselines.
I can get it to plot everything by giving it an “enabled-as check only” coordinate on the road and a grid azimuth on the first backsight but it’s not happy, it has big coordinate differences at the GPS points which has to do with the rotation at the last GPS control point a lot of turns ago. I try to adjust and after 100 iterations it can’t converge.
Star*Net can handle this no problem, give it a free coordinate on the first setup on the road and a free azimuth (from my pocket compass-it’s a degree off) and Star*Net can put it together. In fact, you can feed garbage into Star*Net and it will give an answer, a terrible answer but it’ll do it. The only time it fails is if I don’t give it provisionals where it needs them or I forget to change the SSs to Ms on the traverse observations. It gives you something to look for. But this survey is fine, it’s just a problem of computing it correctly. I gave TGO the final coordinate and backsight azimuth from Star*Net but it still just can’t do it correctly.
Maybe I’m not feeding in the provisionals correctly, not sure.
Log in to reply.