If only I knew this in my undergraduate level, I would have made a distinction in this subject. Though the math 842.17 + 4.69 is 846.86 not 848.86.Thanks a lot.
I've been in this profession for 20 years and I can tell you I sure do wish I had RUclips Back Then however nothing beats getting out in the field and actually doing it.. most people call these a level Loop or a closed level Loop and there are a few ways to close a level Loop and perform adjustments.. I started out as a wood carrier / tail chainman... Many youngsters these days wouldn't even know what that was..
Great sounding, well spoken voice Tim, I agree with the gentleman below who commented on your math, I was trying to follow along, writing, adding notes and values you gave in the video, none come out as were supposed too, I went back, re-listened, I figured I missed some thing, over and over, my math, never added or subtracted correctly, I certainly could not prove any of my measurements, ie. the math involved, from the onset, forward proving and rear wont work either from a mistake at the onset, you taught me that at the Onset, lol,lol, great videos, please proof check your videos before publication, sincerely WC
This was a better presentation than when I was first introduced to these concepts. I do think it’s funny that measurements were carried to the hundredths place when this was only for illustrative purposes. I guess as math guys, we just can’t help ourselves.
I do enjoy watching these videos, they have increased my knowledge....but in this video they show 842.17 + 4.69 =846.86 , and the video came up with 848.86 and I cannot figure how they came up with this number, am I missing something or is it just an error? If an error, it throws off all the math
Maybe because its feet and inches? 12 inches to a foot? So they carry forward 12 instead of 10 in the calculation. I'm Malaysian so am using metric system and also too lazy to do any calculations to test my theory. Sorry.
When you are doing a tutorial get your first simple sum right....842.17+ 4.69 = 846.86 apart from that brilliant set of videos explaining how levels work thank you.
If you add all of the + (bs) together. Then add all of the - (fs) together. Take the algebraic difference and add or subtract from the original BM elevation you get the new BM elevation. In this case the + readings are 29.17 the - readings are 26.38. Meaning the new BM is 2.79’ higher. 842.17 + 2.79 = 844.96. He ended up with the right elevation even if some of the numbers are wrong.
I have always preferred permanent turn points because I usually intend to run back through them to close the loop... And if you keep accurate notes in your field book you can return to these points and use them for other job sites..
That's a nice Lietz/Sokkia B1 32x automatic level. It's quite superior to what Sokkia makes these days. It was manufactured when for every different magnification there was a unique instrument design, with a unique compensator. Now, all of their instruments look exactly the same, but with different magnifications. It makes their automatic level sales a lot more profitable when they don't have to bother with manufacturing so many different models. But, the customer gets short-changed in the end.
I like this video a lot but, my new BM is 858.64 Correct me if I'm wrong but, I don't think subtracting moving up the hill was the proper way to get the new bm?
Hi there, could you explain where 842.17 BM measurement came from. In an open field there will be no known BM. How to find sea level or set a datum point. Thank you
Thanks for explaining this. Question: How does the level take the lowest reading when the rod holder is always tilting the rod? I don't understand this
Jamilla Dambo the person on the rod rocks it slightly back and forth. The point where the horizontal cross hair touches the lowest reading is the measurement that gets recorded. When the rod is out of level, the cross hair will touch a higher number on the rod.
If you know the correct elevation at one point (in this case 842,17), then shouldn’t all new readings be subtracted (or added) based on the known elevation? Why using the HI value? I don’t understand this.. For example.. If you know that the elevation at the first BS point is ”842,17” (the known elevation) and the measuring at TP1 reads ”-6,08” below the known elevation.. shouldn’t the elevation at TP1 then be ”842,17 - 6,08 = 836,09”?
Great videos without exception! Very informative and helped me a lot, but I have a couple questions about the Turning Point and especially if using a mobile one such as the cold chisel. If it isn't placed in the ground correctly and to the same depth at each new Turning Point won't it throw the readings off. Any suggestions on how to accurately place the chisel or other object so as not to throw everything off. Also on some other videos I have heard then say measure the height of the instrument as of they measure it off the ground with a tape measure. Don't think that's the case, but just thought I would ask to be clear if that is ever an option or procedure. Thanks in advance. I have liked and subscribed!
hi sorry for asking how do u know the value of the known elevation at benchmark is 842.17??where that value suddenly appeared?im sorry because i really curious about that value. Is the value already exist at the known benchmark?
The principle is clear, however, what actions are taken to prevent accumulation of errors doing a circuit? Does anyone actually use optical instruments any more?
If at all possible you should take a last foresight back to your starting benchmark and see if it coincides with the value you started off with. It should be within an inch or so if you've got it right. Incidentally, in England, the backsight is defined as the first reading you take after setting up the instrument. The foresight is the last reading you take before moving the instrument. All the other sights are intermediate sights, eg if you are doing a level grid over a building site to compute volume of excavation. Also in England, HI is called HPC, or height of plane of collimation. The measuring rod is called a staff, and the guy carrying it round is the chainman. I have spent many enjoyable hours and days doing this kind of work, starting back in the 1960's. Best wishes from a fellow surveyor in North West England. Educated at Salford Technical College by some great teachers.
When you dont know how to add or subtract ...surveying is not the industry you should be working in. One simple calculation being wrong from the start, will end up being a costly mistake.... great video
Explanation of the concept is great but math of HI is wrong. It should come up with 846.86 then for TP1 instead of subtracting 6.09 you subtracted 8.09 to get the right number of 840.78 .. that's 2 feet difference. ????
What a beautiful and educating video, when an observation is made on BS, u can make series of observation (IS=intermidiary sight) in chainages assuming u r working on route or semi flat terrain. Until u can't c d staff reading clearly then u take (FS= FORE SIGHT) thanks. From a young surveyor in NIGERIA
35 years in the industry and Ive never seen such a simple, clear and concise illustration.. Well done.
These two videos are the best out there. You are an excellent teacher. Thank you!
If only I knew this in my undergraduate level, I would have made a distinction in this subject. Though the math 842.17 + 4.69 is 846.86 not 848.86.Thanks a lot.
Mmmm Todd may have set it up to see if We paid attention? 🦘✌️
Thank goodness for youtube and amazing teachers like this man. I am in Survey 1 and this is EXACTLY what I needed.
I've been in this profession for 20 years and I can tell you I sure do wish I had RUclips Back Then however nothing beats getting out in the field and actually doing it.. most people call these a level Loop or a closed level Loop and there are a few ways to close a level Loop and perform adjustments.. I started out as a wood carrier / tail chainman... Many youngsters these days wouldn't even know what that was..
I am building my own home and these videos are extremely helpful!
Great sounding, well spoken voice Tim, I agree with the gentleman below who commented on your math, I was trying to follow along, writing, adding notes and values you gave in the video, none come out as were supposed too, I went back, re-listened, I figured I missed some thing, over and over, my math, never added or subtracted correctly, I certainly could not prove any of my measurements, ie. the math involved, from the onset, forward proving and rear wont work either from a mistake at the onset, you taught me that at the Onset, lol,lol, great videos, please proof check your videos before publication, sincerely WC
Never saw better explanation than this on youtube
842.17 + 4.69 = 846.86. Or did I miss a step. Thanks for this great video
thanks to your video i did well on the exam today. God bless you and your creators!!!
Thanks for this series, it is working great as a review of class.
I too was checking the first addition and came up with 846.86. I'm sure he did that to see if you all were paying attention!
yea I noticed that too
Thank you sir. Im studying for the FE exam and have never learned how to survey, so this is very helpful.
Great explanation. But wouldn't you return to the original bm to close the loop to make adjustments on the final bm height?
Thank you so much for a wonderful tutorial. Really do appreciate it
I ran a highway construction survey crew for 16 years. Had a level sling on my shoulder many times.
This was a better presentation than when I was first introduced to these concepts. I do think it’s funny that measurements were carried to the hundredths place when this was only for illustrative purposes. I guess as math guys, we just can’t help ourselves.
Great video and does a perfect job of explaining this concept
I do enjoy watching these videos, they have increased my knowledge....but in this video they show 842.17 + 4.69 =846.86 , and the video came up with 848.86 and I cannot figure how they came up with this number, am I missing something or is it just an error? If an error, it throws off all the math
Maybe because its feet and inches? 12 inches to a foot? So they carry forward 12 instead of 10 in the calculation. I'm Malaysian so am using metric system and also too lazy to do any calculations to test my theory. Sorry.
When you are doing a tutorial get your first simple sum right....842.17+ 4.69 = 846.86 apart from that brilliant set of videos explaining how levels work thank you.
I just asked if I was missing something, thanks for clearing up what I just commented on as a mistake
dont worry the rodman made up for it on the next turn TP1.
Wow I am so happy to watch this video. It has really helped me
If you add all of the + (bs) together. Then add all of the - (fs) together. Take the algebraic difference and add or subtract from the original BM elevation you get the new BM elevation. In this case the + readings are 29.17 the - readings are 26.38. Meaning the new BM is 2.79’ higher. 842.17 + 2.79 = 844.96. He ended up with the right elevation even if some of the numbers are wrong.
I have always preferred permanent turn points because I usually intend to run back through them to close the loop... And if you keep accurate notes in your field book you can return to these points and use them for other job sites..
sir i am from india .ur all videoes are very good and more brialant gift for me.
A million thank you sir, I've learned alot 🥰 hoping for more video tutorials
In UK a 'TP is called a CP (change point)I was educated back in the sixties Have been a Land Surveyor for 40+ years
Hard work for poor pay
I have to say, I've seen a lot of surveyor's doing their work and for whatever reason, none of them were in a good mood.
thank you sir
this is gonna help me well tomorrow in my practical final exam
need to check your math @ 4:15......... otherwise love the videos, great instruction. nice to listen to someone that knows their stuff.! Thanks
Thanks for another wonderful video
Very good information. Thank you very much.
Thank you so much! This is very helpful. 💜💜💛💛
Thank you very much. The video is really helpful for our students
Make sure your students know his math was wrong.. good lesson, how you can mess things up with a wrong elevation 😂
That's a nice Lietz/Sokkia B1 32x automatic level. It's quite superior to what Sokkia makes these days. It was manufactured when for every different magnification there was a unique instrument design, with a unique compensator. Now, all of their instruments look exactly the same, but with different magnifications. It makes their automatic level sales a lot more profitable when they don't have to bother with manufacturing so many different models. But, the customer gets short-changed in the end.
Good job sir nice effort your method is completely awsome i am also learning servaying kindly you make video step by step about leveling
Thank you sir, this lesson is so helpful!!
Clear explanation
Is this considered to be fly or differential levelling?
so why o large project is there no compensation for the curvature of the earth
Right out the first TP1 is off by 2 feet. Should read 846.86 not 848.86
and the Dead Sea is the lowest place on the Earth's surface. Its elevation is 400 meters (1,312 feet) below sea level
Thank you sir to provide good information for us and new candidates who join surveying field. .Sir do you have tutorials of traverse let me know.
I like this video a lot but, my new BM is 858.64
Correct me if I'm wrong but, I don't think subtracting moving up the hill was the proper way to get the new bm?
Great explanation, but isn’t the math incorrect on HI 1 Sum ?
hi thank u for this great video BUT ( 4:14 minute ) 842.17 + 4.69 = 846.86 😊
God thx.. I was about to get crazy here..
@@NotreQuebecLibre U were confusing at that point pls add a briefing on the video. Because beginners will go in a wrong way. Anyways thank you.
😁😁😁
Thanks for clearing this up I was going crazy with that
Check out 6:10
That calculation is wrong too lol
Hi there, could you explain where 842.17 BM measurement came from. In an open field there will be no known BM. How to find sea level or set a datum point. Thank you
awesome video, thank you.
you didnt mention anything about side shots?
Where are you getting 848.86? 842.17 + 4.69 = 846.86.. Please explain?
James Conrad I have that same question?
Thanks for explaining this. Question: How does the level take the lowest reading when the rod holder is always tilting the rod? I don't understand this
Jamilla Dambo the person on the rod rocks it slightly back and forth. The point where the horizontal cross hair touches the lowest reading is the measurement that gets recorded. When the rod is out of level, the cross hair will touch a higher number on the rod.
Since the rod doesn’t have a level bubble, it has to be rocked to remove error.
Great video!! Now get the laser out and a direct reading stick, we are burning daylight.
I belive there is a mistake on the first measurement should be 846.86 not 848.86
Thanks a lot, it's very interesting.
If you know the correct elevation at one point (in this case 842,17), then shouldn’t all new readings be subtracted (or added) based on the known elevation? Why using the HI value? I don’t understand this..
For example.. If you know that the elevation at the first BS point is ”842,17” (the known elevation) and the measuring at TP1 reads ”-6,08” below the known elevation.. shouldn’t the elevation at TP1 then be ”842,17 - 6,08 = 836,09”?
Great videos without exception! Very informative and helped me a lot, but I have a couple questions about the Turning Point and especially if using a mobile one such as the cold chisel. If it isn't placed in the ground correctly and to the same depth at each new Turning Point won't it throw the readings off. Any suggestions on how to accurately place the chisel or other object so as not to throw everything off. Also on some other videos I have heard then say measure the height of the instrument as of they measure it off the ground with a tape measure. Don't think that's the case, but just thought I would ask to be clear if that is ever an option or procedure. Thanks in advance. I have liked and subscribed!
hi sorry for asking how do u know the value of the known elevation at benchmark is 842.17??where that value suddenly appeared?im sorry because i really curious about that value. Is the value already exist at the known benchmark?
Will ASL datums change as global warming causes the seas to rise
this well understood keep me posted.
Great, I love it. Thanks
Thanks for this
The principle is clear, however, what actions are taken to prevent accumulation of errors doing a circuit? Does anyone actually use optical instruments any more?
If at all possible you should take a last foresight back to your starting benchmark and see if it coincides with the value you started off with. It should be within an inch or so if you've got it right.
Incidentally, in England, the backsight is defined as the first reading you take after setting up the instrument. The foresight is the last reading you take before moving the instrument. All the other sights are intermediate sights, eg if you are doing a level grid over a building site to compute volume of excavation.
Also in England, HI is called HPC, or height of plane of collimation. The measuring rod is called a staff, and the guy carrying it round is the chainman.
I have spent many enjoyable hours and days doing this kind of work, starting back in the 1960's. Best wishes from a fellow surveyor in North West England. Educated at Salford Technical College by some great teachers.
When you dont know how to add or subtract ...surveying is not the industry you should be working in. One simple calculation being wrong from the start, will end up being a costly mistake.... great video
I'm interested in precise leveling... Where there will be explanation about micro meter & how to book & check it... Thank you 😊
I think you can help me a lot ☺️
Explanation of the concept is great but math of HI is wrong. It should come up with 846.86 then for TP1 instead of subtracting 6.09 you subtracted 8.09 to get the right number of 840.78 .. that's 2 feet difference. ????
Excellent!
Nice explaination... Thanks
848.86-6.08=842.78, not 840.78, case dismissed.
Can you upload the vedio of tunnel surveying
Question: How you keep strait line for measurements or control the line?
I may be wrong, but I don't think the straightness of the line is important here. They are not measuring distance in this case.
@@KKhhoorrnniittee Indeed straightness does not matter, you could also go in a zigzag for example, or even a circle.
Subscribed
What a beautiful and educating video, when an observation is made on BS, u can make series of observation (IS=intermidiary sight) in chainages assuming u r working on route or semi flat terrain. Until u can't c d staff reading clearly then u take (FS= FORE SIGHT) thanks. From a young surveyor in NIGERIA
Hi Gbade, from Nigeria too, found the video informing. Had forgotten most of the procedures... took a Civil ENGR course in my 3rd year.
His second point is correct at 840.78!
Very useful video
Clear explanation and thank you
Thank you Sir But 🤔👉👉842.17+4.69 = 846.86
&
👉👉846.86-6.08 = 840.78
thumb up sir
How much can a surveyor make annually ??
If you mess up all the readings by 2 inches, not very much. :)
Thank you so much sir
You blew it on the height of instrument math. Should be 842.17 + 4.69 = 846.86.
this one is precise
846.86
Very useful
ăn tết vui vẻ nha
v.nice video
thanks sir
a few mathematical errors in there, good clear demonstration thou.
Thanku sir
Nice
epic
make it more practical rather than theoretical concept
0
maths
Wrong addition
But if you don't do the math right, you get it all wrong no matter what instrument you use.
Hi thank you for this video but tje First HI is not 848.86 it is 846.86.