Put me right if this isn't correct but I think they found out the Pacific was 4 inches higher when they built the Panama Canal, or was it 4 inches lower ? Tidal ranges differ certainly, but essentially the sea is essentially the same level the world over. There is a difference, depending on what how you define sea level. The level is higher at the equator because of the centrifugal force of the Earth spinning and the gravitational forces of the sun and the moon.
Mean sea level is the same everywhere. Tidal variations are different in different places. You would need local info for this. The local coastguards could give you this.
it is higher up on Mount Everest so it has less pressure than at sea level
This type of map is called a bathymetric map. It measures the different levels below the sea level. It is like a topographic map but below sea level.
jks
The simple answer is zero feet elevation, but first of all, it is almost impossible to tell that you are at the exact sea level that is the average of all the different sea levels caused by all the different tide elevations. That is why GPS and surveying do not much use "mean sea level", anymore. These days "zero elevation" is determined by the strength of the field of gravity as calculated and measured all around the world.
Mountains are points of high elevation, or above sea level while basins have low elevations and are commonly below sea level.
It depends on what you mean by "here", but at any location above sea level, aveages pressure where you live will be lower than it is at sea level. The higher up you live, the lower the aveage pressure.
i
above sea level
"ft below sea level" typically refers to the elevation measurement of a location relative to sea level. It indicates how many feet below the average sea level a specific point is situated. This measurement is commonly used in geography and cartography to describe the topography of different regions around the world.
There are many different predictions about sea level rise, but the most likely sea level rise by 2100 is between 80cm and 1 metre (2.5 to 3 feet).
The lowest point in Hawaii is in the Pacific Ocean at sea level. what the heck!