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Height above mean sea level is a measure of a location's vertical distance ( height, elevation or altitude) in reference to a vertical datum based on a historic mean sea level. In geodesy, it is formalized as orthometric height. The zero level varies in different countries due to different reference points and historic measurement periods.
This is also referred to as “height above mean sea level”. The planet earth is extremely large and has radically diverse elevations. For example, the highest point on earth is Mt. Everest, which is about 29,000 feet above sea level. The lowest point on earth is the Mariana Trench in the Western Pacific, which is approximately 35,000 feet ...
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Height above mean sea level (AMSL) is the elevation (on the ground) or altitude (in the air) of an object, relative to a reference datum for mean sea level (MSL). It is also used in aviation, where some heights are recorded and reported with respect to mean sea level (contrast with flight level ), and in the atmospheric sciences , and in land ...
The image above shows that the datum is “Mean High Water”, but other common datums for height include “Mean High Water Springs”, “Highest Astronomical Tide”, or “Mean Sea Level”. As the most common one that I have seen personally, I like to reference MHWS.
Reset. For over 27 years, satellite altimeters have measured the sea surface height of our ever-changing oceans. This image shows the change in sea surface height across the globe from 1993 to 2019. Credit: NASA. A plot shows global change in sea level since 1993, as observed by satellite altimeters.
May 3, 2018 · The mean sea level is a scientific term that is used to describe the average height of the oceans around the world. This average is determined by using the measurements of less active water, otherwise known as still or calm water, to avoid any possible increases due to waves or wind. Several industries, particularly those geared toward aviation ...
Jul 8, 2019 · Mean Sea Level. The standard "mean sea level" around the world is usually based on 19 years of data that average out hourly readings of the sea level around the world. Because mean sea level is averaged around the world, using a GPS even near the ocean can result in confusing elevation data (i.e. you might be on a beach but your GPS or mapping ...
