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mean sea level – середній рівень моря;
differential leveling - геометричне нівелірування;
subsidence – падіння, осідання.
Task 2. Read and translate the text.
Figure 5.1. Geodetic datums
Datums (figure 5.1.) are the basis for all geodetic survey work.
They act as reference points in the same way that starting points do
when you give someone directions. For instance, when you want to
tell someone how to get to your house, you give them a starting point
that they know, like a road or a building. Geodesists and surveyors use
datums as starting or reference points when they create maps, mark off
property boundaries, plan, design and build roads, bridges, and other
structures.
Another way to think about a datum is as a set of information that
acts as a foundation for other data. For example, when a skyscraper is
about to be built, the construction team must first pour the foundation.
Without this element, the skyscraper would be unstable and unsafe.
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