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Formulas That Work

Formulas That Work is a surveyor support group for sharing common or not so common calculation shortcuts and formulas for survey data calculations

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Latest Activity: Aug 5

Formulas That Work and Surveying Calculations Discussion Group

Share and discuss surveying calculation methods and formulas for finding solutions in the field.

Have a formula you'd like to share?

Start a new discussion, give your formula a title and describe what the formula allows you to calculate and a few situations when you have found your formula to be valuable in the field...

Land Surveyor Forum - Community Discussions

Use Shadow of a Tree to Calculate Height

Started by Jaybird. Last reply by Sutoidem Theophilus Aug 5. 4 Replies

Here is a really cool trick to calculate the height of a tree using its shadow, taught by Jeff Jenson of UNLV…Read more →

Tags: surveying, formula, trees, height, shadow

L. R. , What is L R ? I was asked that one day. He was not ready for the answer.

Started by Billy Brooks. Last reply by Billy Brooks Jun 14, 2016. 10 Replies

One Day, On the tailgate of my survey truck I had plans waiting to be look at , and calculators here and there with Data Collectors, scales ,triangles erasers pen , pencils the every day survey…Read more →

Tags: LR

Traverse, Traverse Line and How does GPS fit into all of this with GPS Traverse

Started by Billy Brooks. Last reply by Billy Brooks Apr 1, 2016. 13 Replies

If you look the word traverse up it is used as a noun, a verb, a adverb, a adjective and the list goes on.It also  has many definitions other than the survey term .  In…Read more →

Tags: surveying, GPS, traverse

Double rodding, I never called it this, I used Double turns, 2 of something

Started by Billy Brooks. Last reply by Billy Brooks Mar 21, 2016. 3 Replies

Hello Eveyone, I guess it does not matter what you call it ,if it can be mastered it saves time and money.Running…Read more →

Tags: surveying, method, levelling, double rodding

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Reply by cujoBoudreaux on March 13, 2011 at 10:03am
to establish the chord...... Sin of Delta X Rad dist...... This should give you your chord but watch those significant digits, cuz if you round too early, it will be again, hope it helps.
Reply by cujoBoudreaux on March 13, 2011 at 9:51am
(DELTA ANG/ 360 DEG) x ( PIE X 2 RAD) = LENGTH OF ARC. This formula shows that the delta ang establishes the percent of a circle, and that percent is directly proportional to the length of circumference it projects.....This can be done on a cheepy calc and needs minimum info. Hope this helps someone out there.
Reply by George Spencer on March 12, 2011 at 9:55pm
Thanks Justin for this website. When I was just starting out (1968), I sure would have liked for some kind of insight to help me to figure out various calculations. Of course, all I had then was a "Log Book" and my paper and pencil. In the office, I did have the availability of a Munroe hand-cranked calculator, but most of my calcs were by the old pencil and paper. In '72, we got a hand-held HP 35 (I think that's what it was), and that was the "cat's meow" for calculating. However, it still was manual calcs for figuring areas, closures, pre-determined areas, etc.
Reply by Chris Root on March 12, 2011 at 7:28pm
a^2 + b^2 = c^2\!\, is one that will save the day in many occasions.  A right triangle solution called the Pythagorean theorem.


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