Sea level call the provision of a water surface of the World Ocean. Sea level can be tidal, average daily, average annual, etc. Usually mean mean annual level by a phrase "height above sea level". Measure sea level on the steep line concerning a certain conditional point of a reference mark.
It is required to you
- GPS navigator, Internet-applications.
Instruction
1. The satellite altimetriya helps to measure sea level. According to it make, for example, the card of the changes of sea level connected with various natural phenomena. Also scientists make cards of fluctuations of mean sea level. Considering average values of height of each orbit over the World Ocean, it is possible to define the average level of the World Ocean. The satellite altimetriya helps to study reliefseabottom among other things: in hollows and deflections the sea level is lower, in areas of heights – above. If you need to know height above sea level, buy the GPS navigator: GPS determine heights on the basis of information from satellites. GPS receivers with the built-in barometer altimeter can brag of the largest accuracy.
2. A row old, but actively used technological methods which were not outdate to this day is applied. This, first of all, geodetic leveling. Leveling helps to determine height of any given point above sea level or concerning a certain starting point. This type of measurement is used at design, construction of roads, various constructions, etc.
3. And for definition of fluctuations of sea level use such device as a mareograf (limnigraf). It is the stationary device which keeps continuous record, fixing the slightest changes of water level in this point. It consists of the sensitive receiver float and the writing mechanism. Mareograf are coastal and intended for the high sea.
4. Also for registration of changes of water level both in the seas, and in the rivers or lakes the hydrological (water-measuring) post is used. The water-measuring post can be pile and rack.
5. Well, and the most inquisitive, but the people who are not engaged in scientific activity can, without leaving the house, to use the special program or the application, for example, of popular Google of Earth and to learn height above sea level in any point on the map.