> How easy, how cheap, how possible is it to obtain 0.3 m accuracy in 3D position? Elevation gets interesting. Earth has tides in solid rock that are ballpark of that scale peak-peak. It would be interesting to see if you could see the tides with low cost gear. -- These are my opinions. I hate spam.

Hi Keep in mind when you look at the “peak to peak” numbers for solid tides that you may have to observe things for 20,000 years to see the full peak to peak…… They also are variable depending on just how close you are to what sort of coastline. ( = they interact with sea tides when you get close). Bob > On Apr 25, 2018, at 3:26 PM, Hal Murray <hmurray@megapathdsl.net> wrote: > > >> How easy, how cheap, how possible is it to obtain 0.3 m accuracy in 3D position? > > Elevation gets interesting. Earth has tides in solid rock that are ballpark > of that scale peak-peak. > > It would be interesting to see if you could see the tides with low cost gear. > > > -- > These are my opinions. I hate spam. > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there.