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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:

National Surveyors Week March 15-21

GPS on Benchmarks 2015


Adopt-A-Road

Next Clean-up: March 7, 2015


From Gary Hall @ Smart Vents, a follow-up Guide:

Non-Engineered Opening Guide.pdf


Senate Bill 1467 (Chapter 400 - 2014)

Copy of text file


2009 Manual of Instructions

is now available as a searchable pdf.


Our Newsletter "The Prism" January 2015

New California Surveyor: "Winter 2014"

BPELSG News:

BPELSG Example CBT Examination Questions:

BPELSG Bulletin: Winter 2014

BPELSG Strategic Plan: Adopted: July 31, 2014


California High Speed Rail Authority looking for

a Senior Land Surveyor
Closes March 5th, 2015


Santa Clara County Surveyor adds

Cadastral Corner Records (with links)


New in the Library:

Added Historical FEMA Maps Stanislaus, Mercd and San Joaquin Counties
Stanislaus County - Started adding Unfiled Surveys from DF Engineering archives
City of Modesto - Added Block Books (County Surveyors copy)
San Joaquin County - updated ROS, PM, M&P, Corner Records
Tuolumne County - Updates to Corner Records/ROS/Parcel Maps
  added UR files
Sacramento County - updated record maps/corner records
  added Unrecorded Maps
Tulare County - Added County Surveyor link/record maps


2015 CLSA/NALS Conference


CLSA Chapter Website of the Year - 2012