where in the usa is sea level measured from?

Answer 1

The short answer is something like, "sea level is measured from the average elevation of the sea."

A complete answer gets very complicated. See these articles:
http://en.wikipedia.org/wiki/Sea_level
http://en.wikipedia.org/wiki/Geodesy

Answer 2

the quick answer is: poorly. the topic is that the sea isn't at aspect. version contained in the gravity field of the earth make some places to be as a lot as 2 hundred meters diverse from different places. as an get mutually, round islands, the sea aspect have a tendency to be decrease because of the gravitational pull of the land mass. Then, the earth is a lengthy way from being a sphere or maybe, a suited ellipsoid. This will develop right into a difficulty at the same time as doing e.g. elevation calculation utilising satellites like the GPS. Elevation is calculated from a suited geometry then corrected for what's termed the geoidal height; a correction table for the actual position. yet it really is not even precise through lack of an consumer-friendly reference. it really is the reason NASA has at present a undertaking to apply satellites to map extra appropriately the exterior of the sea. as an get mutually, at the same time as the GPS would nicely be utilized as secondary navigation device on plane, the ICAO (global Civil Aviation business organization) would not understand using GPS for altitude indication. it really is not precise adequate. A pity, although, because it would want to eliminate the pick of complicate and expensive so-said as ILS device on the runways. of route, all this isn't even thinking the tide and the waves. The maritime widespread is to apply the so-said as chart datum, it really is the overall low spring tide.

Answer 3

this is physics, not only to USA, but anywhere on the globe, sea level is measured at the sea with barometer to get the pressure reading. then the calculation starts, for every one degree decrease on barometer reading constitutes certain height.

Answer 4

everywhere ++++ what you think of as sea level is the normal water height at low tide or high tide and varies from minute to minute due to winds currents etc ++++but there is an average height that is sea level

Answer 5

The level all around the world is measured from the Chart Datum,

Answer 6

from whatever point you are interested in knowing how far above sea level it is.
sea level, aka 0 feet above, is measured from the sea....as its water, its the same anywhere on the surface.

did you ever see mountains in your glass of water?

Answer 7

The sea.

Answer 8

Pacific Ocean.

Answer 9

the equator, all levels are measured from the equator

Answer 10

any coast, is at sea level