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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 Coordinator

Annette Lockhart, Chair LadyLandSurveyor@gmail.com

Chapter News:


City of Turlock announces

New Monument Preservation Policy


Our Newsletter "The Prism" May 2015

California Surveyor: "Spring 2015"

BPELSG News:

BPELSG Example CBT Examination Questions:

BPELSG Bulletin: Spring 2015

BPELSG Proposed Changes to Board Rule

Section 438 of Title 16 of the California Code of Regulations
and more


R.E.Y. Engineers, Inc., Sacramento

is looking for Surveyors


Santa Clara County Surveyor adds

SBE Maps

Cadastral Corner Records (with links)

Out of (Santa Clara) County Maps
from the Hermann records - mostly San Joaquin County, so far.


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


Adopt-A-Road

Last 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.


Upcoming Workshops

Topic: GPS, Geodesy, and the Ghost in the Machine
  • Speaker: Michael Dennis, PLS
  • June 26th - Sacramento, CA
Program & Registration Information


Topic: Railroads 101
  • Speaker: Charlie Tucker
  • August 7 - Santa Rosa, CA


Mark your calendars!
Registration and program information coming soon


CLSA Chapter Website of the Year - 2012-2014