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Chart key Completed Underway/In Progress Delayed Planned/Not yet started Cancelled

Complete bi-national plan for IGLD (2020) and present to the Coordinating Committee for approval2018
Choose and adopt a W0 as the new IGLD (2020) reference zero2015
Identify potential partners and users who can help develop and implement IGLD (2020)2016-2023
Digitize and archive old leveling information, as required2016-2023
Perform annual maintenance and leveling ties at permanent water level gauges2016-2024
Perform analysis of permanent gauging requirements and prioritize new proposed gauges2023 (CHS)
Complete (NOAA)
Adjust and publish 2015 GPS campaign survey results2017
Complete preparing internationally coordinated methodologies for determining heights using GNSS surveys and leveling at tie gauges2017-2025
Complete preparation of international outreach and communications plan, and begin implementation2017-2020
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 movement2017-2018
Perform analysis of seasonal gauging requirements and prioritize locations2017-2023
Continue annual installations of seasonal water level gauges with GPS and leveling ties2017-2023
Perform 2020 GNSS campaign survey in Great Lakes – St. Lawrence River system, including entity gaugesSummer 2022
Adopt North American geoid model for IGLD (2020)2025
Create crustal movement models for the Great Lakes – St. Lawrence River system using GPS campaigns and CORS/CACS data2023
Complete seasonal water level gauging2023
Determine hydraulic correctors2024
Determine new Low Water Datum on lakes and rivers with respect to IGLD (2020)2025
Determine and publish transformations between IGLD (2020) and other datums, including IGLD (1895)2025
Perform 2025 GNSS Campaign at permanent gauges and validate IGLD (2020) heights and crustal movement model2025
Publish new IGLD (2020)2026
Publish final IGLD (2020) report2026