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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:

2009 Manual of Instructions

is now available as a searchable pdf.


Our Newsletter "The Prism" September 2014

New California Surveyor: "Spring 2014"

BPELSG News:

BPELSG Example CBT Examination Questions:

BPELSG Bulletin: Summer 2014

BPELSG Strategic Plan: Adopted: July 31, 2014


Caltrans is recruiting

surveyors/engineers and college seniors studying surveying, surveying engineering, or surveying geomatics to take the online Transportation Surveyor Exam  for positions throughout California. They are looking for talented surveyors from around the United States for this hard-to-recruit for position. Please see the attached flyer which has all of the information.


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


Upcoming Webinars

Free for CLSA Members

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

Register Online for any/all


CLSA Chapter Website of the Year