[time-nuts] OT [GPS Survey grade RX]

jimlux jimlux at earthlink.net
Mon Dec 6 00:29:46 UTC 2010


bg at lysator.liu.se wrote:
>> When you start getting to less than a meter.. For absolute, you need to
>> start worrying about stuff like solid earth tides, plate movement, a whole
>> host of things are all contributors in that 10-100 cm range.
> 
> Absolute and relative... can be a word game. It depends what DATUM
> (coordinate system) you want to have your answer in.


I use relative to mean "between measurements that are made locally" and 
absolute to mean "relative to astronomical reference" (e.g. some ECI frame)



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