What does vertical datum refer to? Is it Mean Sea Level (MSL)? Is it a zero mark in the tide gauge? Is it some other height value than zero, far from the tide gauge? Is it one reference benchmark? Is it all the benchmarks in the levelling network? Is it the combination of all these?
Is it Mean Sea Level (MSL)? - Yes. It is often used for national datum.
Is it a zero mark in the tide gauge? - Yes. It is possible to.
Is it some other height value than zero, far from the tide gauge? -Yes. It often used for a city local vertical datum.
Is it one reference benchmark? Yes for a city datum.
Is it all the benchmarks in the levelling network? Yes. It is called as mean vertical level for a survey territory.
Is it the combination of all these? Yes. Some more stable benchmarks can be used for vertical stability control.
Every datum is conventional artificial solution.
A vertical datum is a type of reference surface used to measure the heights or depths of objects and features relative to a common point of origin. This common point of origin is typically referred to as a benchmark, which can be either a physical or virtual point with a known elevation above or below the datum.
The choice of vertical datum to use will depend on a few factors, such as the intended application and the geographic location. For many countries, Mean Sea Level (MSL) is the most commonly used vertical datum. MSL represents the average height of the sea surface over a period of time, and it's often referred to as the tidal datum. This reference point is used to measure elevations and depths of objects relative to the water level.
However, in some cases, a different datum may be necessary. For example, in areas that experience significant land subsidence or sea level rise, a local datum may be used to achieve more accurate measurements of elevations and depths.
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