GPS Plots

These plots depict north, east and up components of the station as a function of time. The station velocities are in a North America fixed reference frame derived from ITRF2005 using an Euler pole defined by Altamimi et al.

Vel-stddev = sqrt(WN**2+RW**2) where WN is a white noise contribution from propagating the error bars on the observations and RW is a random walk contribution (= a*sqrt(timespan) / timespan where a is 0.001 m/yr**1/2)