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Welcome to the PLSC Website!

PLSC is a non-profit association dedicated to the improvement of land surveying education and practice. We encourage land surveying professionals and individuals interested in our profession to participate in our upcoming events, visit our Chapter websites and get involved! This is a great profession, and PLSC is here to support the profession to continually improve the practice within Colorado.

Need a Land Surveyor?

PLSC cannot recommend one surveyor over another. If you need a land surveyor, please  go to the Colorado Department of Regulatory Agencies (DORA) and download the list of Colorado licensed surveyors and also check for any disciplinary actions against a particular surveyor under the "Verify License Tab" on the DORA site. Certified Federal Surveyors are listed at Be sure to check references for the surveyor you are considering hiring.


NOTICE: New BETA Coordinates Available for CORS and OPUS
Posted February 19, 2019

BETA Continuously Operating Reference Stations (CORS) coordinates and velocities are now available on our BETA web site for testing.These new International Terrestrial Reference Frame 2014 (ITRF2014) coordinates and a within-realization update of NAD83(2011) CORS coordinates are available on BETA CORS web pages and within the BETA Online Positioning User Service (OPUS) web pages:* BETA CORS Homepage* BETA Description of the CORS reprocessing/results* BETA OPUS* BETA OPUS-ProjectsWhat's NextWithin a few weeks, NGS will BETA release GEOID18, a hybrid geoid model that will provide improved GPS-derived North American Vertical Datum of 1988 (NAVD88)-equivalent heights and ultimately replace GEOID12B. The BETA GEOID18 products will be available for testing in the BETA OPUS products as well.GEOID18 will be the last hybrid geoid model that NGS will create before NAVD88 is replaced by the North American-Pacific Geopotential Datum of 2022.


GPS on Benchmarks Deadline Extension
Posted August 29, 2018

NGS has extended the date to Sept 21 for the GPS on Bm for the geoid model. NGS has added a dashboard with statistics about the GPS on BM information. It provides the number of stations identified, observed and percentage for both the A and B priority as well as the total %. We are making progress, but Colorado still has about 50% to go.


PLSC Is Looking for Website Help
Posted June 06, 2018

PLSC is updating its website and content, and we need your input. If you are interested and have great ideas, let us know. Email or call Becky at 303-551-3266.

Rocky Mountain Surveyors Summit
Posted November 19, 2018

Online registration and program information is now available for the 2019 Rocky Mountain Surveyors Summit. Don't miss your chance to earn continuing education and CFedS credit. We have an exceptional lineup of speakers this year!


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PLSC Events


PLSC Refresher Course

The Professional Land Surveyors of Colorado are offering a comprehensive Land Surveying Refresher Course...

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PLSC Refresher Course

The Professional Land Surveyors of Colorado are offering a comprehensive Land Surveying Refresher Course...

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PLSC Refresher Course

The Professional Land Surveyors of Colorado are offering a comprehensive Land Surveying Refresher Course...

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Other Industry Events


Elevation Certificate Workshop

This half-day workshop will focus on completing and reviewing elevation certificates, which provide elevation...

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Geospatial Summit

NGS is Modernizing the National Spatial Reference System (NSRS)   In case you missed it: NGS...

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2019 SHS Rendezvous

We are excited to announce the Surveyor’s Historical Society (SHS) is planning its ANNUAL RENDEZVOUS...

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Member Spotlight

PLSC would like to introduce you to our members. If you would like to submit your photo and information for a future Spotlight, email the information to

Thomas Breitnauer is a Professional Land Surveyor for the Denver International Airport Survey Section. He has been involved in land surveying since 1985 and is experienced in all types of land surveying. Thomas is licensed in the States of Colorado (1994) and Arizona (2004). Since the introduction of Global Positioning Systems (GPS) to land surveying in the mid-1990’s, Thomas has learned how to set up control networks, process fast static sessions and establish strict quality-control procedures for verification of data content and position. This experience is now benefiting Denver International Airport with the establishment of their own Virtual Reference System (VRS) and seasonal monitoring of Primary Airport Control.

  Thomas is trained in the following programs; National Geodetic Survey (NGS) OPUS Projects, Trimble Business Center and Autodesk Civil 3D. Thomas attended Colorado State University from 1978 to 1981 and the University of Idaho from 1981 to 1982.


PLSC would like to thank our Sustaining Members and Sponsors:

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Professional Land Surveyors of Colorado
PO Box 441069
Aurora, CO 80044
Phone - (303) 551-3266 Fax - (720) 230-4846
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Check out our chapters:
Central Colorado Professional Surveyors | Colorado Spatial Reference Network | Northern Chapter - PLSC | Northwest 1/4 Colorado Land SurveyorsSouthern Chapter Professional Land Surveyors | Southwestern Chapter - PLSC, Inc. | Western Colorado Land Surveyors