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

J. Forster jfor at quik.com
Mon Dec 6 01:43:35 UTC 2010


GPS surveying "relative to astronomical reference"? I don't think so.

-John

==============


> 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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