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Formula for Calculating Coordinates of a PD Theodolite

I found a discussion on My Life Blog which offers a formula for finding the coordinates of a PD Theodolite,which I though might be helpful to a surveyor using this type of instrument.

Calculation of measurement with measurement theodolite.melakukan with Theodolite would be more time consuming calculations Dlm coordinates and elevation data let alone done manually using a calculator without the help of software ms excel at this pc.berikut calculation formulas with manual measurement involves counting theodolite.Perhitungan flat distance (D) skewed distance (S) and height difference (△ H). and after that we calculated would begin to calculate the coordinates X, Y, Z.
The formula:
D = ((ba-bb) -100) * (sin V) ^ 2

S = ((ba-bb) -100) * sin V
△ H = tan (90-V) * D + IH-TH
Coordinate

Kor.X = SIN AZ * D + X ST

Kor.Y = COS AZ * D + Y ST

EL .= △ H + EL ST where the vertical angle V = AZ = Azimuth ST = Station tool tool TH IH = high high = target / beacon meters

Has anyone ever used this formula or this instrument? Have anything to add or change in this formula?

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Subject Tags: calculations, formulas, instrument, theodolite

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Replies to This Discussion

Permalink Reply by Antonio Anaban on March 12, 2011 at 10:50pm

In my first practicum when i was taking my degree, my instructor used to issue me the engineers transit for field work purposes. It is same principle of calculation as it was illustrated above, principle of right triangle. The only difference in the Philippines is that the terminologies. Horizontal distance (flat distance), slope distance (skewed distance), and zenith angle. :-D

Permalink Reply by ePalmetto on March 12, 2011 at 11:28pm

interesting....perhaps you might like to start a new discussion in this group and show us some of the formulas you were taught in the Philippines...you may know some that others on the network have not been exposed to..

Permalink Reply by Antonio Anaban on March 15, 2011 at 5:49am

Heres my of the shortcut in area calculation, I find it handy when there is no programmable calculator around. They dont teach this kind of method in school. I had derived from the book Theory and Practice in Surveying 3rd Edition.

You can comment for any opinion or suggestion to refine the method.

Cheers!