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Geodetic Resources

Colorado Geodetic Working Group

The Colorado Geodetic Working Group currently consists of representatives from NOAA/NGS and PLSC. You can email all participants listed below at

State Plane Coordinates 2022

NGS will soon be developing the SPCS2022 and wants your feedback.  Now is your chance to let your voice be heard!  Currently NGS wants you to provide feedback for the “rulebook” that will be used to develop the coordinate system.  The August 312018 deadline for comment is approaching!  It is important to note, feedback is requested for the Draft Policy.  Your chance to comment on your State’s SPCS Zone development will come at a later date. The Coordinator Working Group has developed a survey (see below) for you to provide responses to. You can provide additional comments as well outside of these forms. However, we prefer states to have unified responses via the State Coordinators.

For the draft policy and more information, view the SPCS2022 Policy Changes page on the NGS website.
The current documents that exist regarding the policy change follows:
Notice: Federal Register (V. 83, No. 75; p. 17149); subject: "Policy and Procedures Documents for the State Plane Coordinate System of2022"; dated: 18 April 2018.

Official Policy Title: "State Plane Coordinate System of 2022 Policy: draft document"; by National Geodetic Survey; undated. (7 pages)

Official Procedure Title: "Procedures for Design and Modification of the State Plane Coordinate System of 2022: draft document" by National Geodetic Survey; undated. ( 15 pages)

NOAA Special Publication NOS NGS 13, “The State Plane Coordinate System: History, Policy, and Future Directions.”
Comments can be sent to or directly to NGS.

GPS on Bench Marks

NOAA’s National Geodetic Survey encourages anyone to help with the GPS on Bench Mark (GPS on BMs) effort to support the next and final national hybrid geoid model, GEOID18, prior to the replacement of NAD83/NAVD88 in 2022. GPS on BM will also assist in developing a robust transformation tool to relate the current datums (NAD83 and NAVD88) to the terrestrial reference frames/geopotential datum that will be released in 2022. Below is an outline of the various steps for this effort as well as NGS resources and local resources for the NGS Rocky Mountain Region (CO, WY and MT). Three webinars were created, one for each of the three key steps outlined below.
GPS on Bench Marks (GPSBM) for GEOID18
Deadline: Aug. 31, 2018
  1. RECOVER: Find and Recover Marks (crowd sourcing, anyone can do this)
  2. OBSERVE: Collect minimum of 4 hours of GPS Data (survey grade units only), 2 photos and a brief description
  3. REPORT: Process data through OPUS Share (only takes a few minutes)
GPS for 2022 Transformation Tool (name subject to change):
In order to develop a robust transformation tool to relate the current datums (NAD83 and NAVD88) to the terrestrial reference frames/geopotential datum that will be released in 2022, NGS requires GPS observations on monuments (bench marks) published in the NGS Integrated Database.  NGS will identify priority stations in the near future.

NGS resources

Priority Map

Rocky Mountain Region (CO, WY and MT) Resources

Webinars for the Rocky Mountain Region
Webinar I: Introduction about the GPS on Bench Mark effort and available resources.
Webinar II: Bench Mark Recovery. We reviewed what a data sheet is and most of its content (so you can find the mark), how to use DS-World to upload your recovery information (descriptions, photos, coordinates) to the NGS database (the information will be added to the existing data sheet). We discussed the map provided for the Rocky Mountain Region (CO, WY and MT) as well as contacts in each of the states.
Webinar III: How to share your GPS Survey data through OPUS.
This does require a minimum of 4 hours of Survey Grade GPS data.
his webinar was been extended by 30 minutes.
Rocky Mountain Region Map and Volunteer Sign up
Signup sheet: Must cut and paste)
Status Map:
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