.. _test_globk_vels:

Run GLOBK to get 3-epoch (4-yr) velocities
==========================================

Get velocities from the 4-year span:

.. code-block:: console

   $ rm globk_vel.org globk_vel.log
   $ globk 6 globk_vel.prt globk_vel.log eura.gdl globk.cmd VEL >& globk.out

where the :option:`VEL` token at the end tells :program:`globk` to uncomment the lines in :file:`globk.cmd` that begin with :content:`VEL`.

Check the :file:`globk_vel.org` file under :content:`EXPERIMENT LIST` for the chi2 increments (< 1.0) in stacking the 3 H-files and the stabilization statistics in the :content:`VEL STATISTICS` and :content:`POS STATISTICS` lines.
For this network and the IGS14 (ITRF2014) :file:`.apr` file, the 9 stabilization stations fit the reference frame in velocity at the level of ~ 1 mm/yr horizontal and 5 mm/yr vertical with uncertainties about half of the rms.