17 feet above sea level at the Billy Mitchell Airport, 4 miles E of Hatteras.
It is 6.7 metres (22 ft) above sea level... visit below link for more info: http://india.co.in/?q=node/133
Key West is 18 feet above sea level.
According to http://www.idcide.com/citydata/me/auburn.htm 300 feet. I don't know how accurate this is though.
The original height of the mountain is estimated to have been 14,000 feet, but after the eruption in 1815, what remains is a mountain that is 9,300 feet above sea level with a caldera that is between 4-5 miles across and 2000-2300 feet deep.
There are two ways to do it, first and the most accurate is by satellite GPS, the GPS receiver have to log on to 3 or more satellites and it can determine the precise coordinates and even the speed it is flying, the other one is by sending a signal out and wait for the bounced signal and measure the time from sending to receiving the signal but that will only give the height above ground level and not above sea level
We call this "elevation".
Vellore is located at an average elevation of approximately 216 meters (709 feet) above sea level.
Karachi is at an average elevation of 8 meters (26 feet) above sea level.
Aprox. 27 feet above sea level
It is 561 feet above sea level.
It is 930 meters above sea level.
7,500 ft above sea level
cochin is below sea level
== == Science Major: Altitude is height above mean sea level (MSL) or true altitude, which means in reference to what sea level is on the ground, or height above ground level (AGL), which is also called absolute altitude, which means height above the ground with no reference to the ground's height above sea level. In example, if the sea level in a certain place is 100 feet and you are 250 feet above the ground, your altitude above sea level would be 350 feet, and your altitude above ground level would be 250 feet.
Mexico City is 2200 meters above sea level.
Ohio has a varied elevation across the state. The highest point is Campbell Hill at 1,549 feet above sea level, while the lowest point is the Ohio River at about 455 feet above sea level.
Sea level is a standard 'height' from which you can measure the relative height of objects (ie. cities) as such, high above sea level would refer to something 1,000+ metres above sea level... or whatever definition you think appropriate.