3-point resection using Tienstra's Method

3-Point Resection Solver

Using Tienstra's Formula

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 a circle.

X Y

(easting) (northing)

Point A

Point B

Point C

Angle alpha (degrees)

Angle gamma (degrees)

Point P

Other Results of Interest

dist AB dist AC

dist BC dist AP

dist BP dist CP

angle BAC degrees

angle ABC degrees

angle ACB degrees