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.
1043 ft above sea level
Its 56 feet above sea level.
MAMSL (Meter Above Mean Seal Level)
Elevation above mean sea level is 92feet (28 meters)
The average elevation is 246 feet above sea level.
Florida's mean (average) elevation is 98 feet above sea level.
Arizona has a higher lowest point at 70 feet above sea level, a higher high point at 12,633 feet above sea level and a higher mean elevation at 4,100 feet above sea level. The highest elevation in South Carolina is 3,560 feet above sea level and its mean elevation is 350 feet above sea level.
metres above the mean sea level
Yes, mean sea level (MSL) is the average (mean) height of the sea.
The official elevation is 154 feet ASL (46.7 meters above mean sea level).
points above sea level
Sea level ~ average (mean) height of the sea, with a reference to a suitable reference point. Elevation ~ height of a geographic location above mean sea level.