When doing description for a leveling circuit how do you describe a turning point(TP). Do you describe the back-sight and foresight or the instrument height. Thanks in advance.
Zack C.
Describe it for what?
I don't really understand the question...
In leveling, a turning point is not occupied by the level. Its sighted first as a foresight and then after the instrument is moved up, its sighted as a backsight. Turning points can be temporary or permanent... describe whatever is used. If your turning points might later be used as temporary bench marks, certainly describe them. Measure the HI of a level during a run??? Never heard of it.
There are many good reference books with chapters dedicated to just leveling... find some and study.
You nailed the subject of this question dead on! ??Question?
+, HI, -, Elev, Desc.
Then fill in the rows & columns. Maybe I don't understand the question either.
(Humor Alert)
Just use whatever teh data collector says, while hooked to the GPS!
Similar to this ...
Just like Dan showed, or with a sketch.... That way if you ever need a TBM you can go find one!
Dan: that is exactly how I was first taught.
I often see the calced HI value placed on the line between the stations (my preference) together with distances between turns (seen but not practiced).
... and then the last column used for the record elevation value (also my preference).
The fly leaf is also great for sketches and math doodles (lots of white space between and after the descriptions).
My level notes look about the same but all my BS & HI data would be shifted down one line. To me it is less confusing than having the BS and FS on the same line. That way, it goes BM, HI, TP, HI...BM just like the sequence in the field. A minor difference is that I write + instead of BS and - instead of FS.
Same as you Steve.
jud
Seems to me that field books aren't used quiet as much as they use to be. Thanks everyone. This finally allowed me to finish a leveling circuit project Ive been working on for college
Kind of hard to see but these are the field notes. Not all the descriptions were input yet.
Craig
Not always. Think Trig Levels. Sometimes you subtract the backsight and add the foresight.
🙂
Zach
> Kind of hard to see but these are the field notes. Not all the descriptions were input yet.
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That is a big NO-NO. The field notes are to be done IN THE FIELD and not from your memory after the day is done. You write it down then, not later.
Mine are like this
Sta. BS HI FS Rod Elev RMKS
We use the rod for the occasional side shot from a level loop, but we don't run much anymore.
Zach
Yes normally I would make sure not to write the notes back at my room but unfortunately I have other class and only get a limited amount of time in the field. My partner and I busted the first circuit by 1.93 and the second try we were within 0.03
z.cross
You might want to add your + and - columns up, the difference should match the difference in your two end point elevations. A quick check done in the field.
jud
Zach
I guess that's the beauty of the spiral notebook - if you screw up you can rip it out of the book. Call me old-fashioned but I use bound books so whatever screw-up there might be is in there forever.
Zach
That is irrelevant. If you are serious about keeping GOOD notes to stand the test of time and your memory, then you better do it right then, not back at the dorm room with that weeks science experiment on the hot plate seeing if you can actually distill alcohol in your room.
(Hint, you can but it takes all week long to make a gallon, but gets you into most any party on campus).
Still, write it then, not later. Stop the crew if necessary. The note keeper is just as important as the PC (most of the time they are one in the same).
When my dad and I work together, he keeps the notes or I keep the notes. It doesn't matter. What does matter is when either of us say stop so the other can catch up.
Most of the time, we try to swamp each other to see who can do a better job of it. I really like it when he keeps the notes. 🙂
z.cross
Yes, I haven't done a math check for the error yet. Thank you.
z.cross
I do agree that the notes shouldn't be done out of the field but unfortunately my other teachers don't care if that's my excuse for why I'm late to class 🙁 Not to mention this is the first time I've done fieldnotes for a leveling circuit so still learning sorry.
