December 2, 2020

Weather News – Road Conditions – weather forecast

A Tale of Three Datums: Keeping Up With an Ever-changing Earth

1 min read


geoid model of the 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.

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