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Define Datum in Real Estate

Datum: 

A "datum" is a starting point or reference used by surveyors to measure the height or elevation of land in an area. It helps people compare different heights and understand how high or low a piece of land is compared to other places.

Example: 

Before building a house on a hill, the surveyors use a known datum, like sea level, to measure the height of the land. This helps them understand how high the hill is and plan the construction of the house accordingly.

"Wit & Whimsy with the Dumb Ox: Unlocking Knowledge with Rhyme:"

A datum, a datum, it's oh so grand,
A point of reference, for heights of land.
Surveyors use it, yes indeed,
To measure elevations, to help you succeed.

From sea level, or another spot,
A datum helps you know a lot.
Comparing heights, both high and low,
A datum guides you, wherever you go.