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Resources & Events

In the years leading up to the release of IGLD (2020), the Coordinating Committee will conduct extensive outreach to share the update with stakeholders. To facilitate this outreach, downloadable resources are being developed and will be uploaded to this website for free, public access. We invite you to share these materials within your network! 

The Coordinating Committee will also host a series of IGLD (2020) outreach events, from summits to webinars, and participate in conferences. Please visit our Presentations and/or Webinars sections below to find out where we’ll speak next, watch recorded events, and learn more about our work!





  1. Title: Datums: More important than you think | Presenters: Jacob Heck (NOAA) | Venue: Michigan Stormwater Floodplain Association 2023 Conference | Dates: March 1, 2023
  2. Title: Updates from NGS: New Datums and Online Tools | Presenters: Jacob Heck (NOAA) | Venue: Illinois Professional Land Surveyors Association 2023 Conference | Dates: February 8, 2023
  3. Title: Datums: The Foundation of Geospatial Data | Presenters: Jacob Heck (NOAA) | Venue: Wisconsin Society of Land Surveyors 2023 Institute | Dates: January 26, 2023
  4. Title: Updates from NGS: Improvements to OPUS Projects and Updates on the NSRS | Presenters: Jacob Heck (NOAA) | Venue: Indiana Society of Professional Land Surveyors Conference | Dates: January 18-20, 2023


  1. Title: Determining heights in the new IGLD (2020)Presenters: Michael Craymer (CGS), Dan Martin (NOAA) | Venue: 2022 Canadian Hydrographic Conference | Dates: June 6-9, 2022
  2. Title: Bi-Nationally Coordinated Water Levels: Charting the way for a new International Great Lakes Datum | Presenters: Sierra Davis (NOAA), Khaleel Arfeen (CHS) | Venue: 2022 Canadian Hydrographic Conference | Dates: June 6-9, 2022
  3. Title: International Great Lakes Datum: Possible Impacts and What you Need to Know | Presenters: Terese Herron (CHS), Laura Rear McLaughlin (NOAA) | Venue: 2022 Canadian Hydrographic ConferenceDates: June 6-9, 2022
  4. Title: The International Great Lakes Datum: Foundational Infrastructure for Monitoring Lake Levels | Presenter: Jacob Heck (NOAA), Jeff Jalbrzikowski (NOAA) | Venue: IAGLR State of Lake Erie Conference | Date: March 17, 2022
  5. Title: Updating the International Great Lakes Datum and Low Water Datum | Presenters: John Allis (USACE), Derek Cusimano (USACE) | Venue: 2022 Post Construction Conference | Date: February 2, 2022


  1. Title: Updating Low Water Datum in the Great Lakes | Presenter: Chris Zervas (NOAA) | Venue: Lakebed 2030 Conference: Let’s Dive In! | Date: September 30, 2021
  2. Title: An Updated International Great Lakes Datum (IGLD): What Does This Mean for Your Field of Practice and Local Community? | Presenter: Nicole Kruz (NOAA – Affiliate) | Venue: Lakebed 2030 Conference: Let’s Dive In! | Date: September 29, 2021
  3. Title: Updating Low Water Datum | Presenter: Chris Zervas (NOAA) | Venue: 2021 US Hydro Virtual Conference | Dates: September 13-16, 2021
  4. Title: Advances in Computational Methods to Deliver the International Great Lakes Datum (2020) Update: Seasonal and Permanent Gauging | Presenters: Sierra Davis (NOAA), Khaleel Arfeen (CHS) | Venue: 2021 US Hydro Virtual Conference | Dates: September 13-16, 2021
  5. Title: Updating the International Great Lakes Datum: Enabling the Integration of Water and Land Management in the Great Lakes Region | Presenters: Jacob Heck (NOAA), Dr. Michael Craymer (CGS) | Venue: FIG Working Week 2021 | Dates: June 21-25, 2021
  6. Title: Lake Surface Topography from Water Gauging, GNSS Observations and Gravimetric Geopotential Models | Presenters: Dan Roman (NOAA), Marc Véronneau (CGS), John Crowley (NRCAN) | Venue: 64th IAGLR 2021 | Dates: May 17-21, 2021


  1. Title: Unknown – included content on Low Water Datum and IGLD (2020) | Presenters: Charles Wisotzkey (NOAA) | Venue: Marine Technology Society Great Lakes Tech Surge | Dates: September 30 – October 2, 2020


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Webinars & Workshops




Tidal & Datums Workshop | April 5-6, 2023 | Video Recording Here | Closed Captioning

  1. Title: IGLD: An Introduction | Presenters: Jacob Heck (NGS), Michael Craymer (CGS)
  2. Title: Moving To and Working in the IGLD | Presenters: Michael Craymer (CGS), Jacob Heck (NGS)
  3. Title: Water Level Data Collection | Presenters: Sierra Davis (NOAA), Khaleel Arfeen (CHS)
  4. Title: LWD: An Introduction | Presenters: Derrick Beach (ECCC), Laura Rear McLaughlin (NOAA), Chris Zervas (NOAA), Terese Herron (CHS)
  5. Title: Impacts on Nautical Charts | Presenters: Travis Newman (NOAA), Mina Foroutan (CHS)
  6. Title: Impacts on Channel Maintenance | Presenters: Esther Johnson (USACE), Cindy Jarema (USACE), Jennifer Marche (CCG), Joffrey Dufour (CCG)


IGLD Workshop Recording Here | Closed Captioning


  1. Title: IGLD (2020) Update | Presenters: Laura Rear McLaughlin (NOAA), Nicole Kruz (NOAA – Affiliate) | Venue: NOAA’s Great Lakes Regional Collaboration Team Meeting | Date: November 19, 2021
  2. Title: IGLD (2020): Updating the common height reference system for the Great Lakes | Presenter: Jacob Heck (NOAA) | Venue: Mapping the Great lakes Webinar Series | Date: June 17, 2021
  3. Title: Vertical Datums: An Overview & Planned Updates | Presenter: Laura Rear McLaughlin (NOAA) | Date: July 15, 2021 from  2:00-3:00 pm ET | View event recording

Media Mentions & Articles

  1. Publisher: Rochester First  | Article Title: A new survey is measuring the height of the Great Lakes | Publication Date: September 2022 | Read here
  2. Publisher: The Record Eagle | Article Title: Remeasuring ‘zero’: Great Lakes datum survey in motion | Publication Date: August 2022 | Read here
  3. Publisher: Great Lakes Seaway Review by Harbor House Publishers (Volume 50, Number 2) | Article Title: New Water Standards: Updating International Great Lakes Datum to Reflect Lake Bottom Rebound | Publication Date: October – December 2021 | Read here
  4. Publisher: Duluth Seaway Port Authority – North Start Port (Volume 54, Number 2) | Article Title: NOAA [and Partners] updating system used to measure Great Lakes water levels | Publication Date: Spring 2021 | Read here
  5. Publisher: Shipwatcher News, #55 (January – February 2021 Edition) | Article Title: Building the International Great Lakes Datum | Publication Date: March 2021 | Read here
  6. Broadcaster: Interlochen Public Radio | Podcast Title: Points North: Rising Water | Release Date: October 1, 2020 | Listen here
  7. Publisher: FreightWaves | Article Title: On the Level: How NOAA Water Data Updates Help Maritime Shippers | Publication Date: September 23, 2020 | Read here
  8. Publisher: The Waterways Journal Weekly | Article Title: GLDT Annual Meeting Addresses Important Datum Changes and Water Level Predictions | Publication Date: June 8, 2020 | Read here

Newsletter Entries

  1. Publisher: NOAA’s Center for Operational Oceanographic Products & Services | Article Title: International Field Survey to Update Great Lakes Reference System – the International Great Lakes Datum (IGLD) | Publication Date: June 2022 | Read here
  2. Publisher: LEVEL News (Volume 29, Number 2) | Article Title: Great Lakes and St. Lawrence River Water Levels – IGLD 1985 Update | Publication Date: February 2021 | Read here
  3. Publisher: USACE Survey & Mapping Community of Practice Newsletter | Article Title: IGLD (2020) Update | Publication Date: April 2021
  4. Publisher: NOAA’s Office of Coast Survey, quarterly Navigation Services Newsletter | Article Title: Datum Updates Will Improve Water Level Measurements in the Great Lakes and Along US Coastlines | Publication Date: October 15, 2020

Technical Reports

International Great Lakes Datum Update plan | See executive summary here