869569026

Application MS Access for Surveying Computations 93

Morę complex forms and, of course, procedurę codes, are needed for the net-work adjustment. Our example will be the surveying network adjustment compu-tation.

The basie formulas used in this program are listed below:

- Observation weights:

- The system of correction eąuations is generated using the following rela-tion:

• for linear observations:

where:

dxp	dyp dxK	%
\-cos Ap_K	-sin^4p_K|cos Ą,_K	sin Ap_K\

P - starting point,

K— ending point,

D_; - observation measured,

Wj- distance correction,

D,° =PK = yJAx² +Ay² - approximated distance,

Ap__K - azimuth for the side measured, dx_p/ dx_K, dy_p, dy_K - partial coordinates;

• for angular observations:

Vj —d(Xj + O. _app_rox —CL measured'

where:

I dx_L dyJthCp dyj dc_c    dy_c

k ą|-A -^ha-ą) -iB_L-B_pf

a, - observation measured,

Vj- angle correction, af - approximated angle,