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CLSA Webinar: GPS on BM Initiative for California

Our NGS State Coordinator (Scott Martin) and NGS Regional Advisor (Dana Caccamise) will present.

Register as a member or non-member at the CLSA Store

CLSA is proud to support the National Geodetic Survey's "2018 - GPS on Benchmarks" program. The program is simply a crowdsourcing call to citizen surveyors to collect GPS observations on NGS NAVD88 benchmarks and share these data with NGS. These collected data will be used to first to create the next hybrid- Geoid 18, then be the basis for the future conversion tool(s) to the upcoming 2022 datum and gravimetric geoid. This effort is an essential component in tying recent GPS observations and solutions to the current national vertical datum - NAVD88.

CLSA recognizes the importance of this program, is tracking progress and actively mobilizing our community. With your help, we can contribute to better heights for years to come. Our goal is to densify the data, hopefully avoid NGS extrapolating geoid data over very large distances uncontrolled. We can git-R-Done!

For more detailed overview see:

CLSA is making every effort to avoid duplication of observations and track our success. Please communicate plans and forward your OPUS solutions to

CLSA Sign-up list: Google Docs Link 


Click here for important reference links.