3-point resection using Tienstra's Method

3-Point Resection Solver

Using Tienstra's Method

by Mesa Mike

beta test version

Calculate the coordinates of Point P given three known reference points and the observed angles between them from Point P.
This is an old surveyor's technique, not used much any more these days.
If you want to see how it's done, use your browser's "view source" function.

NOTE: The results are indeterminate (that means "wildly inaccurate") if all four points lie on (or sufficiently close to) a circle.

X Y

(easting) (northing)

Point A

Point B

Point C

Angle α (degrees)

Angle γ (degrees)

Point P

Other Results of Interest

distance AB distance AC

distance BC distance AP

distance BP distance CP

angle BAC degrees

angle ABC degrees

angle ACB degrees