4.6 Compass Surveying: Local Attraction Correction by Bearings (Complete Numerical)

In this video you will learn, how to determine which stations are affected by LOCAL ATTRACTION by simply BEARINGS OF THE LINES. This one is the easiest method and will enable you to determine LA quickly !

[@bikeshstha33]

Please reply sir will this process work for closed traverse?

[@CivilModules]

No...use this process for open traverse only ! If you use it for closed traverse then you might end up with different values of a particular bearing. For closed traverse problem, first you need to close the traverse by correcting all the included angles and then only you correct all the bearings...

[@bikeshstha33]

@@CivilModules I used it in closed traverse qsn to find bearing only i dont know how but ans were right

[@CivilModules]

Possibly...but make sure after correcting the bearings, the sum of all included angles must be equal to (2n-4)*90. If it is so, then your solution is correct !

[@asvingounder]

Simply superb explaination. Corrected bearings can be calculated without finding included angles which saves a lot of time. Thank you very much sir for the help ✌

[@halawatulquran2479]

Thank u sir AP ne 50 mints ke class 10 mints me batadiya vo be bohot neet

[@PubgmobileMobile-nl6ht]

very good sir

[@noONEknowsME766]

very good explanation sir...really helpful

[@sourovekumar9937]

Thanks sir. 😍😍😍
Love from Bangladesh 🤩🤩🤩🤩🤩

[@abhinavkumar7345]

Love you from angladesh

[@Anonymous-vs7hb]

Thanks for making me understand the concepts which mam Kashmala couldn't

[@Trendy_games]

Thanks sir ☺️ you helped me a lot🙏

[@RajThakur-lf2cl]

Thanks sir .I understand clearly

[@SilverMustang920]

Nice video. One error in the video is the angle 96°55' shown on the figure (ForeBearing of Line BC). It should be drawn from the North clockwise.

[@AnshMishra584]

Isse reading par fark padega kya

[@pubgboy6364]

Theek to h kya galti h

[@jandhyaladharmateja6838]

Thank you sir it's really helpful 😍

[@GauravSingh-cb7tt]

ek jgha corection CD ka positive btya h or dusri jgha negative ..... or digram mai B ke fore bearing ko interior angle bta diya h ....correction kdijiye sir yha bhi

[@halawatulquran2479]

Keep it on sir

[@abhinavkumar7345]

Keep it off sir

[@suresh-rm2kc]

thank you sir for nice explanation

[@acquireenglish1981]

Thnkyou sir❤️

[@playboydhawan7094]

THANKS SIR YOU ARE GREAT 🙏🙏

[@rulesbreaker2209]

Thanks 😇

[@vikashmishra3255]

Nice 👍

[@SaurabhKurhe]

Very good information 🙏🙏❤

[@sanbumeena7718]

Superb explanation

[@syedsartajahmed3601]

Helpd a lot

[@reshmas6169]

Thank u sir really helpful

[@lingarajsatapathy8362]

Thank you sir 🙏

[@tanuomar2541]

Thank you 😊 sir

[@gopalhazra4861]

Thank you sir

[@aryanff7431]

Nice SirJi❤

[@syedfarmanalig]

Thank you

[@doileeyang2772]

Why did you take positive correction for CD?

[@young_vlogger_07]

When error is positive then correction is negative

[@behappy7744]

Super:)

[@khagendrakd222]

Thanks sir❤❤

[@inceptionyt2414]

Sir ur voice same like south indian dubbing voice😁❤🔥

[@whiteyaksha8395]

Good work

[@maazansari871]

With due respect sir,
Station A will also affected by local Attaraction!

[@hey-cz2tl]

Thank uhh ❤️

[@chandramanikumar6636]

Jbrdst sr

[@tripathi9984]

Sir corrected bearing table m fore bearing and back bearing k difference 180 hona chayie na

[@shekhofficial5968]

Your audio quality is too good what u use for editing

[@armaandwivedi5111]

Last line of the video was epic
Dubara dekh lo 😅

[@mayankkumar1837]

Agr back bearing forebearing se kam hoga toh 180° add krnege ya subtract?

[@antupaul3712]

Agar ye closed traverse hota to ka EA bhi correct considered karte

[@TK93771]

If there are two or more zero error line which one will be taken as reference line for correction?

[@shinchu2644]

chho dena

[@user-lt3kl1kx5e]

How can we contact with you sir

[@localbloggerm]

Pliz make a video of fb and bb correction of quadrantal system

[@HimanshuSingh-pc5cv]

you have applied correction of error in negative in 7 mins 21 secs while error is negative the correction should be in positive

[@izzatmuhamad6595]

Good

[@xlaiaryan6582]

why you subtracted 180 degrees from cd???

[@freaks1610]

why we are not taking cd 0 as it also passes through d

[@CivilModules]

That's because now your instrument is at station C where location attraction is detected.Take observation in any direction from C, you will get an error of 35 mins. Thats y from C towards D , error cant be zero.

[@Uttra-khand.]

bhai kyuki station D and E h local attraction se free...na ki C

[@abrarmomin9055]

Line CD mai +35 mint aa raha hai to negative Q liye error -35
At4:30

[@CivilModules]

The difference between FB and BB of line CD is 179 degrees 25 mins, which is 35 mins less than 180 degrees.
At this stage, just observe whether the magnitude of the difference is less than, greater than or equal to 180 degrees. So it doesn't matter whether you are doing BB-FB or FB-BB, what matters is that what is the relation of difference with respect to 180.
Since it is 35 mins less than 180 (error), so in order to make the difference 180, just add 35 mins (correction).

[@tripathi9984]

Sir interior angle method k Ques iss method s krne pr correct ans nhi aa rha h why?

[@suresh-rm2kc]

sir which books you refer for survey

[@thirumalasaivardhan1677]

FB is from north to the line ,but you took from line to line

[@CivilModules]

All the angles are from North direction, whether it is FB or BB. However, in the figure I have mistakenly wrote 96 degree and 55 minutes as an interior angle of B. It is a FB of BC which will come in 2nd quadrant. So the figure will remain the same.

[@thirumalasaivardhan1677]

@@CivilModules yes😅😅

[@thirumalasaivardhan1677]

Sir i think it forms a closed fig

[@CivilModules]

@@thirumalasaivardhan1677 Nope...looking at the table, can you tell me which point is the last point that is connecting back to A?
Now try to make figure by yourself ! Happy learning !!

[@ritwikgaur1858]

Sir if in all question if there is a line which is not free from local attraction, then what we shall do???

[@CivilModules]

Hi Ritwik...
Let me reframe this question. What to do when ALL the lines are having LOCAL attraction?
There are two cases:-
Case 1: There exists at least ONE line in which the difference between FB and BB is 180 degrees. In this case, solve the numerical as shown in this video.
Case2: Not even a single line exists that has a difference of 180 degrees, in this case:
a) Search the line that has the least error for eg. difference in FB and BB is 180 degrees and 10 minutes.
b) Here 10 minutes is the least error among all the lines.
c) Now divide 10 minutes into 2 parts i.e 5 minutes. Adjust 5 mins in FB and 5 mins in BB in such a way so that their difference becomes exact 180 degrees.
d) Now the difference is 180 degrees, use this line as your reference line and solve the rest of the numerical as shown in this video.

[@ritwikgaur1858]

@@CivilModules thank you sir very much. It worked. And also thanks for giving ur time to solve my query.

[@akabhishek228]

SSC JE me es tarah se box banake solve karne pe pure number milenge

[@sangamgupta3595]

Open traverse ka questions hai kya...?
Left after watching 2.30 min

[@tanujgoswami7576]

When the bearing of closed sides is not given in a closed traverse Ye question bata do sir 🙏🙏🙏

[@CivilModules]

Can you elaborate this question? What exactly are your trying to find here?

[@tanujgoswami7576]

@@CivilModules sir
This is the condition and I have to create a question and solve it
Like
Full question is
What is Closed traverse? When the bearing of closed sides is not given in a closed traverse.
Solve 2 numericals

[@CivilModules]

For this numerical you have to provide at least one bearing and all included angles in order to find the bearings of other sides. If this is what you are trying to do...

[@Sanatani__Aman1]

Sir local attractions B or C ?

[@ambikarai8702]

Nice voice btw

[@prashantkote2619]

Abe 277"05'-35'=242"5' hotaa ree kaisaa likhaa oo CB kaa line pe

[@rajankanshal622]

35 min hain degree nahi

[@PoojaSharma-cd8qm]

Sir please sau me how you drawed diagram

[@shivamsingh-shorts]

Very confusing

[@maskedsongster3]

👍

[@banarasiya_babu]

Sir sab kuch poora aaa gya bs bs last me jo apne local attraction batay B orC ko kaise aaya kaise wo aaya samjha me nhi aaya bs last ka 1 min

[@CivilModules]

It turns out that any observation taken from station B and C is wrong, hence it needs to be corrected by fixing the error. That is why station B and C have local attraction. Got it ?

[@paramenglish]

Anyone from BIRLA BHU 🤗

[@utkarshjain861]

Nahi

[@abhinavkumar7345]

I am from Kerala BHU

[@emmanuelochieng3833]

Please explain in English

[@abhinavkumar7345]

Please explain in hindi

[@hariomchandra9048]

Ur concept failed .when i tried SOLVE it on ESE2015 QUESTION where in FB and BB are given in quadrantal bearing and u have to find internal angle and corrected bearings.u can pick that question and make a video solution von that

[@CivilModules]

Can you copy and paste that question here?

[@hariomchandra9048]

@@CivilModules the question contain table which is difficult to copy here u can send mee ur email id i will send u there or u can find in internet the question start with "four cars started from O -S1-S2-S3-S4-O.

[@rvtalk99]

At the point B I think something went wrong

[@phantomswag163]

English please i can't understand properly

[@parimalbaad2288]

Hii

[@jacksononyango7273]

May you pls guys lecture in official language that everybody may understand. Or else you shouldn't post it publicly

[@INDRAJEETKUMAR-lv3ox]

You should know Hindi language,for better outputs.

[@thirumalasaivardhan1677]

You made wrong figure

[@terson44]

Noob it's correct

[@abhinavkumar6866]

@@terson44 ya bro ultra noob 🤓

[@Beaver_Engineers]

Kaun se gola ho se ho Bhai...ye open traverse hai..ye dekh nhi n confused ho.

[@khadeers14]

Wrongly solved

[@CivilModules]

which part ?

[@khadeers14]

@@CivilModules at station B we have 25' error ,u neglected that 25' in station BC,took only 10'

[@CivilModules]

@@khadeers14 Before answering your query I need to know two things: 1) Have you understood how +25 ' error at B was calculated? 2) In this part of your comment " in station BC, u took only 10' ", how did you arrive at this point that 10 ' error has been taken?

[@FURIOUS_PRIYA]

Thank you sir ❤❤

[@meetgajera8768]

Thank you 🙏 sir

[@SaurabhKurhe]

Thank you sir