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Activity Date
Complete bi-national plan for IGLD (2020) and present to the Coordinating Committee for approval Completed
Choose and adopt a W0 as the new IGLD reference zero Completed
Identify potential partners/users who can help develop and implement IGLD (2020) Completed
Digitize and archive old leveling information, as required 2016-2023
Perform annual maintenance and leveling ties at permanent water level gauges 2016-2024
Perform analysis of permanent gauging requirements and prioritize new proposed gauges Completed (CO-OPS), 2023 (CHS)
Adjust and publish 2015 GPS campaign survey results Completed
Complete preparing internationally coordinated methodologies for determining heights using GNSS surveys and local leveling at tie gauges 2017-2025
Review historic water level data for re-evaluation of Low Water Datum (LWD) 2017-2020
Reanalyze and compare all GPS campaign surveys from 1997, 2005, 2010, 2015 to estimate preliminary rates of movement Complete
Perform analysis of seasonal gauging requirements and prioritize locations Completed
Continue annual installations of seasonal water level gauges with GPS and leveling ties 2017-2023
Perform 20201 GNSS campaign survey in Great Lakes – St. Lawrence River system, including entity gauges Summer 2021
Adopt North American geoid model for IGLD (2020) 2024
Create crustal movement models for the Great Lakes – St. Lawrence River system using GPS campaigns and CORS/CACS data 2022-2024
Complete seasonal water level gauging 2023
Determine hydraulic correctors 2024
Determine new Low Water Datum on lakes and rivers with respect to IGLD (2020) 2024
Determine and publish transformations between IGLD (2020) and other datums, including IGLD (1895) 2024
Perform 2025 GNSS Campaign at permanent gauges and validate IGLD (2020) heights and crustal movement model 2025
Publish new IGLD (2020) 2025
Publish final IGLD (2020) report 2026