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Central Valley Chapter
California Land Surveyors Association

Promoting the professional practice of land surveying in the California Central Valley.
Serving the greater Merced, Stanislaus and San Joaquin County Area."

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What is Trigstar?

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Trig Star is an annual high school mathematics competition based on the practical application of Trigonometry. Students that participate are not only provided with an opportunity to earn awards, but also leave with a better understanding of the technical profession of Land Surveying and Mapping.

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Professional Land Surveyors use the Trig Star program to advance communication with the communities they serve.

The purpose of the program is:

  • To promote the study of trigonometry in high school and to promote excellence in the mastery of trigonometry by honoring the individual student who has demonstrated superior skill among classmates at the High School level.
  • To acquaint the high school geometry and trigonometry students with the use and practical application of geometry and trigonometry in the surveying profession.
  • To build an awareness of surveying as a profession among the mathematically-skilled high school students, career guidance counselors and high school math teachers.

What happens during the Trig-Star Contest?

A presentation by a Land Surveyor to help participants understand the Land Surveying/ Geomatics Profession. The exam is a timed exercise, during which students must solve trigonometric problems that incorporate the use of the right triangle formulas, the law of sines, and the law of cosines. The student with the highest score and fastest time will be named the "Trig Star" for each high school participating in the program. The scores and times of the Trig Stars are reviewed to determine the State Winner and Runner-up in California. The State Winner will qualify to take the National Exam.

The Trig Star program is sponsored nationally by the National Society of Professional Surveyors.

Local Trigstar Coordinator

Bill Koch koch1313@yahoo.com

State Trigstar Coordinators

Aundrea L. Tirapelle, Co-Chair dre.052806@gmail.com

Greg Sebourn, Co-Chair gregsebourn@johnson-frank.com

Chapter News:

Wayne G. Sutton, LS 3863

It is with the utmost sadness that I have to pass on that Wayne G. Sutton, LS 3863, my friend and mentor, after a long and brave struggle, passed on Monday morning (August 25th) at Central Valley Specialty Hospital in Modesto. He was surrounded by his family. He leaves a huge void in our surveying community. His knowledge and leadership will missed by all.

More information from Fran

Wayne's Modesto Bee Obituary


CLSA By-Laws Revisions

have been mailed. Please review, vote and return prior to September 10.
Forum Discussion


Our Newsletter "The Prism" July 2014

New California Surveyor: "Spring 2014"

BPELSG News:

BPELSG Example CBT Examination Questions:

BPELSG Bulletin: Summer 2014

BPELSG Strategic Plan: Adopted: July 31, 2014


!! New FEMA Flood Map Service Center !!

A series of major changes, including a complete site redesign, have taken effect on the MSC. All flood hazard products are now available free of charge, and the former products catalog has been replaced with an integrated Search All Products feature that allows you to find and download all products for a geographic area.


New California Appellate Court case

Stresses the importance of "following the footsteps of the original surveyor"
Bloxham_v._Saldinger


Michael Baker International

Is looking for a Manager of Surveying Geomatics
in Sacramento or Walnut Creek, CA


New in the Library:

Merced County - updated record maps
    added Swamp & Overflow Directory
Mariposa County - updated maps
San Joaquin County - updated ROS, PM, M&P, Corner Records


Upcoming Workshops

Evolution of NAD 83 & Coping w/ Changing Positional Coordinates
Evolution of NAD 83 in the United States & Coping w/ Changing Positional Coordinates Due to Crustal Motion
Speaker: Dr. Richard Snay
Program Information
Register online - Oakland
(September 17th)

CLSA-CSRC Workshop - Get a Grip – Keeping Control of Your Work
October 3rd - Ontario ~ October 10th - Oakland
More Information
Registration not yet available.


Upcoming Webinars

Free for CLSA Members

Tidal Datums, and Mapping Sea Level Rise
Speaker: Curt Burfield, PLS
August 28th 12:00-1:30pm

Understanding the Test Plan for the LS Exam. How to Know if the Person You’re Signing a Reference for is Ready to be Licensed
Speaker: Ray Mathe, PLS
September 10th 12:00-1:30pm

CSU Fresno Survey Program
Speaker: Dr. Munjy
October 2nd 12:00-1:30pm

Register Online for any/all


CLSA Chapter Website of the Year