[time-nuts] Plate Tectonics was: GPS Antenna on Tower.

Bob kb8tq kb8tq at n1k.org
Wed Jun 21 16:43:41 EDT 2017


There are some interesting interactions between liquid (sea) tides and solid tides. Big blobs of water sloshing around in the ocean 
really close to shore do turn out to have an effect. Not a big deal for those of us wise enough to live well inland :) Probably a lot of fun
to plot and validate if you are in the “right” location. 

One gotcha pulling this stuff from precision survey data: The post processing software very much knows about these things and 
“helpfully” scrubs them out of your data for you. That’s a not ideal if your goal was to validate the calculations. It sort of is if their 
result comes out as zero, but that’s not very exciting. 


> On Jun 20, 2017, at 7:43 PM, Mark Sims <holrum at hotmail.com> wrote:
> I'm using code from a Fortran program called solid.f  that I converted to C using F2C and modified to use more accurate sun / moon positions.  The solid.f  program is based on an edited version of the dehanttideinelMJD.f source code provided by Professor V. Dehant. This code is an implementation of the solid earth tide computation found in section 7.1.2 of the IERS Conventions (2003) , IERS Technical Note No. 32.
> http://geodesyworld.github.io/SOFTS/solid.htm
> The gravity offset calculation is based upon TVB's  tides.c:
> http://www.leapsecond.com/tools/tides.c
> -------------------
>> This is all new information to me - and fascinating!  Have you just
> "calculated" the offsets (using known values from somewhere), or "measured"
> it by very long term averaging of the GPS position information?
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