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Showing posts with label SURVEY COMPUTATION.. Show all posts
Showing posts with label SURVEY COMPUTATION.. Show all posts

Wednesday, March 13, 2019

SURVEY COMPUTATION

SURVEY COMPUTATION.


IMPORTANT FORMULA.



1. Latitude = distance x cos θ 2. Departure = distance x sin θ 
3. Distance = 2 2 ) ()( depart latit  

4. Angle =  tan-1   depart 
                                latit






Triangulation 

1. c² = a² + b² - 2ab cos C 

2. area = C absin 2 1 

3. area = ) )()(( c sbsass   
    s=   2 a+b+c  
                 2


4.  sin A  =  sin B   
        a              b







Road secant 

a = bearing BA - bearing BC
                         2




θ  = bearing AD – bearing AE
cot α =  L1 cosesθ -cot θ
                   L2



TREE DISTANCE AND TREE POINT PROBLEMS.

BC(AB+BC+CD)   =   sin b(sin a + sin b + sin c )   
     (AB)(BC)                              (sin a) (sin c)





tan Φ = a sin q 
             b sin p
 tan x-y   =tan (Φ - 45o) tan ( x+y )  
        2                                      2


SURVEY COMPUTATION

SURVEY COMPUTATION. IMPORTANT FORMULA. 1. Latitude = distance x cos θ 2. Departure = distance x sin θ  3. Distance = 2 2 ) ()( dep...