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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.


BETA GEOID18 Model Released for Public Comment
Posted March 08, 2019

NGS will replace GEOID12B with GEOID18 in mid-2019. GEOID18 will be the last hybrid geoid model that NGS will create before NAVD 88 is replaced by the North American-Pacific Geopotential Datum of 2022 (NAPGD2022).Hybrid geoid models convert NAD 83 ellipsoid heights to NAVD 88 orthometric heights by constraining a gravimetric geoid model to published or shared orthometric heights at bench marks. Specifically, GEOID18 is intended for use with coordinates in the NAD 83 (2011) reference frame.GEOID18 only covers CONUS, Puerto Rico, and the US Virgin Islands. Users in Alaska, Hawaii, Guam, American Samoa, and CNMI should continue to use GEOID12B.


Governor's Proclamation for 2019 Surveyors Week
Posted March 04, 2019

March 17-23, 2019 has been declared Surveyor's Week by Governor Polis. PLSC is planning a Capitol Day as part of the celebration that week.


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.


Classified Ads

TitleEmployerPost Date
CAD/Survey/Engineering TechnicianLamp, Rynearson & Associates, Inc.01/14/19
Field Land SurveyorESE Consultants, a Toll Brothers company03/19/19
Project Surveyor / Senior Project Surveyor - FieldCWC Consulting, Inc.03/11/19
Project Surveyor / Senior Project Surveyor - OfficeCWC Consulting, Inc.03/11/19
Senior Survey Project ManagerTri-State02/08/19
Survey Party ChiefMatrix Design Group02/19/19
Survey TechnicianMatrix Design Group02/19/19
SurveyorCity of Aurora02/23/19

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.


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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