height above sea level by postcode for cr2 0aj

6 ANSWERS

1. Guest21159173
   

   Try this to <a href="http://www.altitude.nu">find the altitude</a>.

   Report (0) (0)  |   1 year, 4 month(s) ago  

2. Guest16055415
   

   3825

   Report (4) (0)  |   2 years ago  

3. Guest15447520
   

   height above sea level by postcode for bd18 1ep

   Report (0) (0)  |   2 years, 1 month(s) ago  

4. Guest15371299
   

   3198

   Report (0) (0)  |   2 years, 1 month(s) ago  

5. Guest14698075
   

   wn2 1sf

   Report (0) (1)  |   2 years, 1 month(s) ago  

6. Ali Abdullah
   

   Hi, The concept of a "mean sea level" is in itself rather artificial, because it is not possible to determine a figure for mean sea level for the entire planet, and it varies quite a lot even on a much smaller scale. This is because the sea is in constant motion, affected by the high and low pressure zones above it, the tides, local gravitational differences, and so forth. The best one can do is to pick a spot and calculate the mean sea level at that point and use it as a datum. For example, the Ordnance Survey uses a height datum based on the measurements of mean sea level at a particular gauge at Newlyn, Cornwall from 1915 to 1921[1] for their maps of Great Britain, and this datum is actually some 80 cm different from the mean sea level reading obtained on the other side of the country. An alternative is to base height measurements on an ellipsoid of the entire earth, which is what systems such as GPS do. In aviation, the ellipsoid known as World Geodetic System 84 is increasingly used to define mean sea level. Another alternative is to use a geoid based datum such as NAVD88.

   Report (0) (0)  |   2 years, 1 month(s) ago