Length: 5 hours, 1 minute

Audience: For those interested in understanding the International Great Lakes Datum (IGLD), Low Water Datum (LWD), water level data collection, and their impacts on key applications.

This recording is from a virtual workshop hosted in collaboration with NOAA Offices, National Geodetic Survey (NGS), Canadian Geodetic Survey (CGS), ECCC, CHS, and USACE. It features expert presentations from various organizations, offering insights into these critical subjects. The workshop explores key topics related to the IGLD and its practical applications, including:

• Overview of IGLD – Jacob Heck (NGS), Michael Craymer (CGS) (Starts at 00:05:55])
• Moving To and Working in the IGLD – Michael Craymer (CGS), Jacob Heck (NGS) (Starts at 00:34:09)
• IGLD 2020: Water Level Data Collection – Sierra Davis (NOAA CO-OPS), Khaleel Arfeen (CHS) (Starts at 01:05:45)
• IGLD Breakout Session (Starts at 01:24:00)
• Updating Low Water Datum in the Great Lakes – Derrick Beach (ECCC), Laura Rear McLaughlin (NOAA CO-OPS), Chris Zervas (NOAA CO-OPS), Terese Herron (CHS) (Starts at 02:25:05)
• Impacts of Datum Changes on Nautical Charts – Travis Newman (NOAA OCS), Mina Foroutan (CHS) (Starts at 02:51:37)
• Low Water Datum Update: Impacts to Great Lakes Navigation and Channel Maintenance – Esther Johnson (USACE), Cindy Jarema (USACE), Jennifer Marche (CCG), Joffrey Dufour (CCG) (Starts at 03:21:30)
• Low Water Datum Breakout Session (Starts at 4:09:25)

Whether you are directly impacted by the NTDE updates or simply interested in the science of tidal datums, this comprehensive session offers valuable insights from experts in the field.

Length: 1 hour, 4 minutes

Audience: For those seeking an introduction to vertical datums and upcoming changes. No prior knowledge of this topic is necessary.

This webinar provides an overview of vertical datums, essential references for determining elevations, and the significant updates coming in the next few years. Presented by Jacob Heck, Laura Rear McLaughlin, Terese Herron, and Michael Michalski, the session covers:

• The replacement of the North American Vertical Datum of 1988 (NAVD 88) with the North American-Pacific Geopotential Datum of 2022 (NAPGD2022).
• Updates to the International Great Lakes Datum (IGLD), used to reference water levels in the Great Lakes and connecting channels.
• Changes to the National Tidal Datum Epoch (NTDE), which references water levels along the U.S. coastline.