I can do GPS spacing for level work with my DC, it's no bigger than a cell phone and I don't need a base, pole, or receiver head to use it. Quick, easy, as fast or faster than pacing. Within a meter each time, plenty good for that type of measurement. And if you don't want that get a golf rangefinder.
Yeah. Thats a great way to do it for sure. I had not thought of that. I remember the back pack days no rod needed for certain things lol.
@ dmyhill
There's no advantage to having the legs balanced so closely except to make the office happy because they like it that way. The advantage was worth the time and effort. We saved time, especially when tying into an existing run. The effort was minimal. The purpose of the project was to extend the county network. We started and closed on published BMs from one run and ran through three BMs from another one. Those three BMs now have multiple elevations on them. Do you use least squares to come up with the best elevations for those?
@ OleManRiver
How long did it take you to run through that line (s). Nice job. I use to do similar with gps rtk.
It took about three days. We used GPS RTK. Thanks for the compliment.
"Those three BMs now have multiple elevations on them."
What purpose does adding yet another elevation serve?
@ chris-bouffard
It seems to me that, based on the method mandated, the mandate for the procedure was dictated by office staff.
It was not. We thought it might speed things up.
Was it really necessary to send somebody ahead with GPS/GNSS equipment to stake to a line that was predetermined by office calcs, or, could that have been easily been accomplished by either pacing or slap chaining distances between turning points?
It was easier and more efficient than pacing. There were no office calcs.
Are a few feet of distance between back and fore readings going to change the results?
Certainly not. FGCC (1984) third order leveling specifies difference of forward and backward sight lengths never to exceed 10 m per setup and 10 m per section. I think that's been supersede by standards that address digital leveling.
@ chris-bouffard
Those three BMs now have multiple elevations on them.”
What purpose does adding yet another elevation serve?
See Surveying Theory and Practice, Davis and Foote, Sixth Edition p. 172. Specifically, 5.51 Adjustment of levels over different routes. I need to learn how to do this.
You're missing my question.
Hey so make yourself a copy of the digital files and level notes. Sign up for the next NGS geodetic leveling course. Great class. It has been 14 years since I attended one. But what you learn a lot. One thing is you have a closure good. And your balanced distances check the requirements. Now apply the orthometric corrections adjust it etc. c/r corrections temp corrections. Once done you have it going on. Until then it’s just difference in heights. Great job . So were you on level crew Iman two rod persons . Leveling is an art. I spoke with several that’s all they did every day. Man they were a unit. They have that leveling class twice a year. Spring and fall. So around October. If you can come message me i will make sure to buy you a beer. They tried the virtual thing but it is better when you spend the week doing field and office. You can probably watch the online and get the corrections and adjustments part down maybe compare to the office results. All the programs from NGS software is free so are the classes. Make your boss send you if they can.
Reminded me of Topcon's Z-Plus rover that has a base station with inclinometer, unfortunately it's Japanese market only, I've been keeping an eye on online auctions, in the hopes of getting one. The first thing I'd do is ask our local rep to send it away for calibration, just to get Topcon thinking about selling them in other markets.
@ chris-bouffard
The last time I spoke with my field crew supervisor concerning multiple elevations on BMs from the other run he said he's going to average those elevations. We're in the process of connecting different runs throughout our county. Sorry for the misunderstanding. Thanks for participating in the discussion.
@ OleManRiver
So were you on level crew Iman two rod persons .
No. PC, I-man (me), rod person.
If you can come message me i will make sure to buy you a beer.
I like Heineken dark lager. You?
I like a dark beer myself. Yeah. If you ever do get over my way. I have you covered.
What kind of differences are you seeing between published and observed values? A few hundredths, or tenths?
Russian Imperial Stout
