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#664747
Mon 16 Nov 2020 01:18:PM
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Joined: Feb 2001
Posts: 381,903
Launch Director
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OP
Launch Director
Joined: Feb 2001
Posts: 381,903 |
A Tale of Three Datums: Keeping Up With an Ever-changing Earth NOAA is currently working on three major updates to vertical datums. They’re used for everything from nautical charts and flood maps to infrastructure planning. A datum is a reference system that starts at an agreed data point. You’re probably familiar with at least one horizontal datum — latitude and longitude. If you’ve been to a mountaintop and seen a sign with the distance above sea level, you’re also familiar with vertical datums, which measure heights. Here’s a rundown on what we’re updating and why. Continue reading → https://oceanservice.noaa.gov/geodesy/three-datums.html
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