Mean sea level:
This is determind by observing accurately and precisely the SAE LEVEL at a point over a period of time less than a year,this defines the vertical datum of survey in any locality.
Any FRIEND has more details how to observed and final adjustment mehtod.
This Content Originally Published to Land Surveyors United Network
Hi, you can adjust and compute your data base on your selected datum (clark spheroid of 1866, transverse mercator, etc.) there you can only justify and relate your result with the corresponding control network locally or nationally approve by the country's or state's survey ministry. You can also check out the Geodetic Almanac for some tips.
Mr Anotonio, Thanks for you reply and share information. bye